it the function. * * @since 3.1.0 * * @param null|bool $check Whether to allow adding metadata for the given type. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. Must be serializable if non-scalar. * @param bool $unique Whether the specified meta key should be unique * for the object. Optional. Default false. */ $check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique ); if ( null !== $check ) return $check; if ( $unique && $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d", $meta_key, $object_id ) ) ) return false; $_meta_value = $meta_value; $meta_value = maybe_serialize( $meta_value ); /** * Fires immediately before meta of a specific type is added. * * The dynamic portion of the hook, `$meta_type`, refers to the meta * object type (comment, post, or user). * * @since 3.1.0 * * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. */ do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value ); $result = $wpdb->insert( $table, array( $column => $object_id, 'meta_key' => $meta_key, 'meta_value' => $meta_value ) ); if ( ! $result ) return false; $mid = (int) $wpdb->insert_id; wp_cache_delete($object_id, $meta_type . '_meta'); /** * Fires immediately after meta of a specific type is added. * * The dynamic portion of the hook, `$meta_type`, refers to the meta * object type (comment, post, or user). * * @since 2.9.0 * * @param int $mid The meta ID after successful update. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. */ do_action( "added_{$meta_type}_meta", $mid, $object_id, $meta_key, $_meta_value ); return $mid; } /** * Update metadata for the specified object. If no value already exists for the specified object * ID and metadata key, the metadata will be added. * * @since 2.9.0 * * @global wpdb $wpdb WordPress database abstraction object. * * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user) * @param int $object_id ID of the object metadata is for * @param string $meta_key Metadata key * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. * @param mixed $prev_value Optional. If specified, only update existing metadata entries with * the specified value. Otherwise, update all entries. * @return int|bool Meta ID if the key didn't exist, true on successful update, false on failure. */ function update_metadata($meta_type, $object_id, $meta_key, $meta_value, $prev_value = '') { global $wpdb; if ( ! $meta_type || ! $meta_key || ! is_numeric( $object_id ) ) { return false; } $object_id = absint( $object_id ); if ( ! $object_id ) { return false; } $table = _get_meta_table( $meta_type ); if ( ! $table ) { return false; } $column = sanitize_key($meta_type . '_id'); $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; // expected_slashed ($meta_key) $meta_key = wp_unslash($meta_key); $passed_value = $meta_value; $meta_value = wp_unslash($meta_value); $meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type ); /** * Filter whether to update metadata of a specific type. * * The dynamic portion of the hook, `$meta_type`, refers to the meta * object type (comment, post, or user). Returning a non-null value * will effectively short-circuit the function. * * @since 3.1.0 * * @param null|bool $check Whether to allow updating metadata for the given type. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. Must be serializable if non-scalar. * @param mixed $prev_value Optional. If specified, only update existing * metadata entries with the specified value. * Otherwise, update all entries. */ $check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value ); if ( null !== $check ) return (bool) $check; // Compare existing value to new value if no prev value given and the key exists only once. if ( empty($prev_value) ) { $old_value = get_metadata($meta_type, $object_id, $meta_key); if ( count($old_value) == 1 ) { if ( $old_value[0] === $meta_value ) return false; } } $meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s AND $column = %d", $meta_key, $object_id ) ); if ( empty( $meta_ids ) ) { return add_metadata($meta_type, $object_id, $meta_key, $passed_value); } $_meta_value = $meta_value; $meta_value = maybe_serialize( $meta_value ); $data = compact( 'meta_value' ); $where = array( $column => $object_id, 'meta_key' => $meta_key ); if ( !empty( $prev_value ) ) { $prev_value = maybe_serialize($prev_value); $where['meta_value'] = $prev_value; } foreach ( $meta_ids as $meta_id ) { /** * Fires immediately before updating metadata of a specific type. * * The dynamic portion of the hook, `$meta_type`, refers to the meta * object type (comment, post, or user). * * @since 2.9.0 * * @param int $meta_id ID of the metadata entry to update. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. */ do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); } if ( 'post' == $meta_type ) { foreach ( $meta_ids as $meta_id ) { /** * Fires immediately before updating a post's metadata. * * @since 2.9.0 * * @param int $meta_id ID of metadata entry to update. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. */ do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); } } $result = $wpdb->update( $table, $data, $where ); if ( ! $result ) return false; wp_cache_delete($object_id, $meta_type . '_meta'); foreach ( $meta_ids as $meta_id ) { /** * Fires immediately after updating metadata of a specific type. * * The dynamic portion of the hook, `$meta_type`, refers to the meta * object type (comment, post, or user). * * @since 2.9.0 * * @param int $meta_id ID of updated metadata entry. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. */ do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); } if ( 'post' == $meta_type ) { foreach ( $meta_ids as $meta_id ) { /** * Fires immediately after updating a post's metadata. * * @since 2.9.0 * * @param int $meta_id ID of updated metadata entry. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. */ do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); } } return true; } /** * Delete metadata for the specified object. * * @since 2.9.0 * * @global wpdb $wpdb WordPress database abstraction object. * * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user) * @param int $object_id ID of the object metadata is for * @param string $meta_key Metadata key * @param mixed $meta_value Optional. Metadata value. Must be serializable if non-scalar. If specified, only delete metadata entries * with this value. Otherwise, delete all entries with the specified meta_key. * @param bool $delete_all Optional, default is false. If true, delete matching metadata entries * for all objects, ignoring the specified object_id. Otherwise, only delete matching * metadata entries for the specified object_id. * @return bool True on successful delete, false on failure. */ function delete_metadata($meta_type, $object_id, $meta_key, $meta_value = '', $delete_all = false) { global $wpdb; if ( ! $meta_type || ! $meta_key || ! is_numeric( $object_id ) && ! $delete_all ) { return false; } $object_id = absint( $object_id ); if ( ! $object_id && ! $delete_all ) { return false; } $table = _get_meta_table( $meta_type ); if ( ! $table ) { return false; } $type_column = sanitize_key($meta_type . '_id'); $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; // expected_slashed ($meta_key) $meta_key = wp_unslash($meta_key); $meta_value = wp_unslash($meta_value); /** * Filter whether to delete metadata of a specific type. * * The dynamic portion of the hook, `$meta_type`, refers to the meta * object type (comment, post, or user). Returning a non-null value * will effectively short-circuit the function. * * @since 3.1.0 * * @param null|bool $delete Whether to allow metadata deletion of the given type. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. Must be serializable if non-scalar. * @param bool $delete_all Whether to delete the matching metadata entries * for all objects, ignoring the specified $object_id. * Default false. */ $check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all ); if ( null !== $check ) return (bool) $check; $_meta_value = $meta_value; $meta_value = maybe_serialize( $meta_value ); $query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key ); if ( !$delete_all ) $query .= $wpdb->prepare(" AND $type_column = %d", $object_id ); if ( $meta_value ) $query .= $wpdb->prepare(" AND meta_value = %s", $meta_value ); $meta_ids = $wpdb->get_col( $query ); if ( !count( $meta_ids ) ) return false; if ( $delete_all ) $object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s", $meta_key ) ); /** * Fires immediately before deleting metadata of a specific type. * * The dynamic portion of the hook, `$meta_type`, refers to the meta * object type (comment, post, or user). * * @since 3.1.0 * * @param array $meta_ids An array of metadata entry IDs to delete. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. */ do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); // Old-style action. if ( 'post' == $meta_type ) { /** * Fires immediately before deleting metadata for a post. * * @since 2.9.0 * * @param array $meta_ids An array of post metadata entry IDs to delete. */ do_action( 'delete_postmeta', $meta_ids ); } $query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . " )"; $count = $wpdb->query($query); if ( !$count ) return false; if ( $delete_all ) { foreach ( (array) $object_ids as $o_id ) { wp_cache_delete($o_id, $meta_type . '_meta'); } } else { wp_cache_delete($object_id, $meta_type . '_meta'); } /** * Fires immediately after deleting metadata of a specific type. * * The dynamic portion of the hook name, `$meta_type`, refers to the meta * object type (comment, post, or user). * * @since 2.9.0 * * @param array $meta_ids An array of deleted metadata entry IDs. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. */ do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); // Old-style action. if ( 'post' == $meta_type ) { /** * Fires immediately after deleting metadata for a post. * * @since 2.9.0 * * @param array $meta_ids An array of deleted post metadata entry IDs. */ do_action( 'deleted_postmeta', $meta_ids ); } return true; } /** * Retrieve metadata for the specified object. * * @since 2.9.0 * * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user) * @param int $object_id ID of the object metadata is for * @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for * the specified object. * @param bool $single Optional, default is false. If true, return only the first value of the * specified meta_key. This parameter has no effect if meta_key is not specified. * @return mixed Single metadata value, or array of values */ function get_metadata($meta_type, $object_id, $meta_key = '', $single = false) { if ( ! $meta_type || ! is_numeric( $object_id ) ) { return false; } $object_id = absint( $object_id ); if ( ! $object_id ) { return false; } /** * Filter whether to retrieve metadata of a specific type. * * The dynamic portion of the hook, `$meta_type`, refers to the meta * object type (comment, post, or user). Returning a non-null value * will effectively short-circuit the function. * * @since 3.1.0 * * @param null|array|string $value The value get_metadata() should * return - a single metadata value, * or an array of values. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param string|array $single Meta value, or an array of values. */ $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single ); if ( null !== $check ) { if ( $single && is_array( $check ) ) return $check[0]; else return $check; } $meta_cache = wp_cache_get($object_id, $meta_type . '_meta'); if ( !$meta_cache ) { $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); $meta_cache = $meta_cache[$object_id]; } if ( ! $meta_key ) { return $meta_cache; } if ( isset($meta_cache[$meta_key]) ) { if ( $single ) return maybe_unserialize( $meta_cache[$meta_key][0] ); else return array_map('maybe_unserialize', $meta_cache[$meta_key]); } if ($single) return ''; else return array(); } /** * Determine if a meta key is set for a given object * * @since 3.3.0 * * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user) * @param int $object_id ID of the object metadata is for * @param string $meta_key Metadata key. * @return boolean true of the key is set, false if not. */ function metadata_exists( $meta_type, $object_id, $meta_key ) { if ( ! $meta_type || ! is_numeric( $object_id ) ) { return false; } $object_id = absint( $object_id ); if ( ! $object_id ) { return false; } /** This filter is documented in wp-includes/meta.php */ $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true ); if ( null !== $check ) return (bool) $check; $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); if ( !$meta_cache ) { $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); $meta_cache = $meta_cache[$object_id]; } if ( isset( $meta_cache[ $meta_key ] ) ) return true; return false; } /** * Get meta data by meta ID * * @since 3.3.0 * * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user) * @param int $meta_id ID for a specific meta row * @return object Meta object or false. */ function get_metadata_by_mid( $meta_type, $meta_id ) { global $wpdb; if ( ! $meta_type || ! is_numeric( $meta_id ) ) { return false; } $meta_id = absint( $meta_id ); if ( ! $meta_id ) { return false; } $table = _get_meta_table( $meta_type ); if ( ! $table ) { return false; } $id_column = ( 'user' == $meta_type ) ? 'umeta_id' : 'meta_id'; $meta = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $table WHERE $id_column = %d", $meta_id ) ); if ( empty( $meta ) ) return false; if ( isset( $meta->meta_value ) ) $meta->meta_value = maybe_unserialize( $meta->meta_value ); return $meta; } /** * Update meta data by meta ID * * @since 3.3.0 * * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user) * @param int $meta_id ID for a specific meta row * @param string $meta_value Metadata value * @param string $meta_key Optional, you can provide a meta key to update it * @return bool True on successful update, false on failure. */ function update_metadata_by_mid( $meta_type, $meta_id, $meta_value, $meta_key = false ) { global $wpdb; // Make sure everything is valid. if ( ! $meta_type || ! is_numeric( $meta_id ) ) { return false; } $meta_id = absint( $meta_id ); if ( ! $meta_id ) { return false; } $table = _get_meta_table( $meta_type ); if ( ! $table ) { return false; } $column = sanitize_key($meta_type . '_id'); $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; // Fetch the meta and go on if it's found. if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) { $original_key = $meta->meta_key; $object_id = $meta->{$column}; // If a new meta_key (last parameter) was specified, change the meta key, // otherwise use the original key in the update statement. if ( false === $meta_key ) { $meta_key = $original_key; } elseif ( ! is_string( $meta_key ) ) { return false; } // Sanitize the meta $_meta_value = $meta_value; $meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type ); $meta_value = maybe_serialize( $meta_value ); // Format the data query arguments. $data = array( 'meta_key' => $meta_key, 'meta_value' => $meta_value ); // Format the where query arguments. $where = array(); $where[$id_column] = $meta_id; /** This action is documented in wp-includes/meta.php */ do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); if ( 'post' == $meta_type ) { /** This action is documented in wp-includes/meta.php */ do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); } // Run the update query, all fields in $data are %s, $where is a %d. $result = $wpdb->update( $table, $data, $where, '%s', '%d' ); if ( ! $result ) return false; // Clear the caches. wp_cache_delete($object_id, $meta_type . '_meta'); /** This action is documented in wp-includes/meta.php */ do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); if ( 'post' == $meta_type ) { /** This action is documented in wp-includes/meta.php */ do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); } return true; } // And if the meta was not found. return false; } /** * Delete meta data by meta ID * * @since 3.3.0 * * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user) * @param int $meta_id ID for a specific meta row * @return bool True on successful delete, false on failure. */ function delete_metadata_by_mid( $meta_type, $meta_id ) { global $wpdb; // Make sure everything is valid. if ( ! $meta_type || ! is_numeric( $meta_id ) ) { return false; } $meta_id = absint( $meta_id ); if ( ! $meta_id ) { return false; } $table = _get_meta_table( $meta_type ); if ( ! $table ) { return false; } // object and id columns $column = sanitize_key($meta_type . '_id'); $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; // Fetch the meta and go on if it's found. if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) { $object_id = $meta->{$column}; /** This action is documented in wp-includes/meta.php */ do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); // Old-style action. if ( 'post' == $meta_type || 'comment' == $meta_type ) { /** * Fires immediately before deleting post or comment metadata of a specific type. * * The dynamic portion of the hook, `$meta_type`, refers to the meta * object type (post or comment). * * @since 3.4.0 * * @param int $meta_id ID of the metadata entry to delete. */ do_action( "delete_{$meta_type}meta", $meta_id ); } // Run the query, will return true if deleted, false otherwise $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); // Clear the caches. wp_cache_delete($object_id, $meta_type . '_meta'); /** This action is documented in wp-includes/meta.php */ do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); // Old-style action. if ( 'post' == $meta_type || 'comment' == $meta_type ) { /** * Fires immediately after deleting post or comment metadata of a specific type. * * The dynamic portion of the hook, `$meta_type`, refers to the meta * object type (post or comment). * * @since 3.4.0 * * @param int $meta_ids Deleted metadata entry ID. */ do_action( "deleted_{$meta_type}meta", $meta_id ); } return $result; } // Meta id was not found. return false; } /** * Update the metadata cache for the specified objects. * * @since 2.9.0 * * @global wpdb $wpdb WordPress database abstraction object. * * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user) * @param int|array $object_ids array or comma delimited list of object IDs to update cache for * @return mixed Metadata cache for the specified objects, or false on failure. */ function update_meta_cache($meta_type, $object_ids) { global $wpdb; if ( ! $meta_type || ! $object_ids ) { return false; } $table = _get_meta_table( $meta_type ); if ( ! $table ) { return false; } $column = sanitize_key($meta_type . '_id'); if ( !is_array($object_ids) ) { $object_ids = preg_replace('|[^0-9,]|', '', $object_ids); $object_ids = explode(',', $object_ids); } $object_ids = array_map('intval', $object_ids); $cache_key = $meta_type . '_meta'; $ids = array(); $cache = array(); foreach ( $object_ids as $id ) { $cached_object = wp_cache_get( $id, $cache_key ); if ( false === $cached_object ) $ids[] = $id; else $cache[$id] = $cached_object; } if ( empty( $ids ) ) return $cache; // Get meta info $id_list = join( ',', $ids ); $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; $meta_list = $wpdb->get_results( "SELECT $column, meta_key, meta_value FROM $table WHERE $column IN ($id_list) ORDER BY $id_column ASC", ARRAY_A ); if ( !empty($meta_list) ) { foreach ( $meta_list as $metarow) { $mpid = intval($metarow[$column]); $mkey = $metarow['meta_key']; $mval = $metarow['meta_value']; // Force subkeys to be array type: if ( !isset($cache[$mpid]) || !is_array($cache[$mpid]) ) $cache[$mpid] = array(); if ( !isset($cache[$mpid][$mkey]) || !is_array($cache[$mpid][$mkey]) ) $cache[$mpid][$mkey] = array(); // Add a value to the current pid/key: $cache[$mpid][$mkey][] = $mval; } } foreach ( $ids as $id ) { if ( ! isset($cache[$id]) ) $cache[$id] = array(); wp_cache_add( $id, $cache[$id], $cache_key ); } return $cache; } /** * Given a meta query, generates SQL clauses to be appended to a main query. * * @since 3.2.0 * * @see WP_Meta_Query * * @param array $meta_query A meta query. * @param string $type Type of meta. * @param string $primary_table Primary database table name. * @param string $primary_id_column Primary ID column name. * @param object $context Optional. The main query object * @return array Associative array of `JOIN` and `WHERE` SQL. */ function get_meta_sql( $meta_query, $type, $primary_table, $primary_id_column, $context = null ) { $meta_query_obj = new WP_Meta_Query( $meta_query ); return $meta_query_obj->get_sql( $type, $primary_table, $primary_id_column, $context ); } /** * Class for generating SQL clauses that filter a primary query according to metadata keys and values. * * `WP_Meta_Query` is a helper that allows primary query classes, such as {@see WP_Query} and {@see WP_User_Query}, * to filter their results by object metadata, by generating `JOIN` and `WHERE` subclauses to be attached * to the primary SQL query string. * * @since 3.2.0 */ class WP_Meta_Query { /** * Array of metadata queries. * * See {@see WP_Meta_Query::__construct()} for information on meta query arguments. * * @since 3.2.0 * @access public * @var array */ public $queries = array(); /** * The relation between the queries. Can be one of 'AND' or 'OR'. * * @since 3.2.0 * @access public * @var string */ public $relation; /** * Database table to query for the metadata. * * @since 4.1.0 * @access public * @var string */ public $meta_table; /** * Column in meta_table that represents the ID of the object the metadata belongs to. * * @since 4.1.0 * @access public * @var string */ public $meta_id_column; /** * Database table that where the metadata's objects are stored (eg $wpdb->users). * * @since 4.1.0 * @access public * @var string */ public $primary_table; /** * Column in primary_table that represents the ID of the object. * * @since 4.1.0 * @access public * @var string */ public $primary_id_column; /** * A flat list of table aliases used in JOIN clauses. * * @since 4.1.0 * @access protected * @var array */ protected $table_aliases = array(); /** * A flat list of clauses, keyed by clause 'name'. * * @since 4.2.0 * @access protected * @var array */ protected $clauses = array(); /** * Constructor. * * @since 3.2.0 * @since 4.2.0 Introduced support for naming query clauses by associative array keys. * * @access public * * @param array $meta_query { * Array of meta query clauses. When first-order clauses use strings as their array keys, they may be * referenced in the 'orderby' parameter of the parent query. * * @type string $relation Optional. The MySQL keyword used to join * the clauses of the query. Accepts 'AND', or 'OR'. Default 'AND'. * @type array { * Optional. An array of first-order clause parameters, or another fully-formed meta query. * * @type string $key Meta key to filter by. * @type string $value Meta value to filter by. * @type string $compare MySQL operator used for comparing the $value. Accepts '=', * '!=', '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE', 'IN', 'NOT IN', * 'BETWEEN', 'NOT BETWEEN', 'REGEXP', 'NOT REGEXP', or 'RLIKE'. * Default is 'IN' when `$value` is an array, '=' otherwise. * @type string $type MySQL data type that the meta_value column will be CAST to for * comparisons. Accepts 'NUMERIC', 'BINARY', 'CHAR', 'DATE', * 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', or 'UNSIGNED'. * Default is 'CHAR'. * } * } */ public function __construct( $meta_query = false ) { if ( !$meta_query ) return; if ( isset( $meta_query['relation'] ) && strtoupper( $meta_query['relation'] ) == 'OR' ) { $this->relation = 'OR'; } else { $this->relation = 'AND'; } $this->queries = $this->sanitize_query( $meta_query ); } /** * Ensure the 'meta_query' argument passed to the class constructor is well-formed. * * Eliminates empty items and ensures that a 'relation' is set. * * @since 4.1.0 * @access public * * @param array $queries Array of query clauses. * @return array Sanitized array of query clauses. */ public function sanitize_query( $queries ) { $clean_queries = array(); if ( ! is_array( $queries ) ) { return $clean_queries; } foreach ( $queries as $key => $query ) { if ( 'relation' === $key ) { $relation = $query; } elseif ( ! is_array( $query ) ) { continue; // First-order clause. } elseif ( $this->is_first_order_clause( $query ) ) { if ( isset( $query['value'] ) && array() === $query['value'] ) { unset( $query['value'] ); } $clean_queries[ $key ] = $query; // Otherwise, it's a nested query, so we recurse. } else { $cleaned_query = $this->sanitize_query( $query ); if ( ! empty( $cleaned_query ) ) { $clean_queries[ $key ] = $cleaned_query; } } } if ( empty( $clean_queries ) ) { return $clean_queries; } // Sanitize the 'relation' key provided in the query. if ( isset( $relation ) && 'OR' === strtoupper( $relation ) ) { $clean_queries['relation'] = 'OR'; /* * If there is only a single clause, call the relation 'OR'. * This value will not actually be used to join clauses, but it * simplifies the logic around combining key-only queries. */ } elseif ( 1 === count( $clean_queries ) ) { $clean_queries['relation'] = 'OR'; // Default to AND. } else { $clean_queries['relation'] = 'AND'; } return $clean_queries; } /** * Determine whether a query clause is first-order. * * A first-order meta query clause is one that has either a 'key' or * a 'value' array key. * * @since 4.1.0 * @access protected * * @param array $query Meta query arguments. * @return bool Whether the query clause is a first-order clause. */ protected function is_first_order_clause( $query ) { return isset( $query['key'] ) || isset( $query['value'] ); } /** * Constructs a meta query based on 'meta_*' query vars * * @since 3.2.0 * @access public * * @param array $qv The query variables */ public function parse_query_vars( $qv ) { $meta_query = array(); /* * For orderby=meta_value to work correctly, simple query needs to be * first (so that its table join is against an unaliased meta table) and * needs to be its own clause (so it doesn't interfere with the logic of * the rest of the meta_query). */ $primary_meta_query = array(); foreach ( array( 'key', 'compare', 'type' ) as $key ) { if ( ! empty( $qv[ "meta_$key" ] ) ) { $primary_meta_query[ $key ] = $qv[ "meta_$key" ]; } } // WP_Query sets 'meta_value' = '' by default. if ( isset( $qv['meta_value'] ) && '' !== $qv['meta_value'] && ( ! is_array( $qv['meta_value'] ) || $qv['meta_value'] ) ) { $primary_meta_query['value'] = $qv['meta_value']; } $existing_meta_query = isset( $qv['meta_query'] ) && is_array( $qv['meta_query'] ) ? $qv['meta_query'] : array(); if ( ! empty( $primary_meta_query ) && ! empty( $existing_meta_query ) ) { $meta_query = array( 'relation' => 'AND', $primary_meta_query, $existing_meta_query, ); } elseif ( ! empty( $primary_meta_query ) ) { $meta_query = array( $primary_meta_query, ); } elseif ( ! empty( $existing_meta_query ) ) { $meta_query = $existing_meta_query; } $this->__construct( $meta_query ); } /** * Return the appropriate alias for the given meta type if applicable. * * @since 3.7.0 * @access public * * @param string $type MySQL type to cast meta_value. * @return string MySQL type. */ public function get_cast_for_type( $type = '' ) { if ( empty( $type ) ) return 'CHAR'; $meta_type = strtoupper( $type ); if ( ! preg_match( '/^(?:BINARY|CHAR|DATE|DATETIME|SIGNED|UNSIGNED|TIME|NUMERIC(?:\(\d+(?:,\s?\d+)?\))?|DECIMAL(?:\(\d+(?:,\s?\d+)?\))?)$/', $meta_type ) ) return 'CHAR'; if ( 'NUMERIC' == $meta_type ) $meta_type = 'SIGNED'; return $meta_type; } /** * Generates SQL clauses to be appended to a main query. * * @since 3.2.0 * @access public * * @param string $type Type of meta, eg 'user', 'post'. * @param string $primary_table Database table where the object being filtered is stored (eg wp_users). * @param string $primary_id_column ID column for the filtered object in $primary_table. * @param object $context Optional. The main query object. * @return array { * Array containing JOIN and WHERE SQL clauses to append to the main query. * * @type string $join SQL fragment to append to the main JOIN clause. * @type string $where SQL fragment to append to the main WHERE clause. * } */ public function get_sql( $type, $primary_table, $primary_id_column, $context = null ) { if ( ! $meta_table = _get_meta_table( $type ) ) { return false; } $this->meta_table = $meta_table; $this->meta_id_column = sanitize_key( $type . '_id' ); $this->primary_table = $primary_table; $this->primary_id_column = $primary_id_column; $sql = $this->get_sql_clauses(); /* * If any JOINs are LEFT JOINs (as in the case of NOT EXISTS), then all JOINs should * be LEFT. Otherwise posts with no metadata will be excluded from results. */ if ( false !== strpos( $sql['join'], 'LEFT JOIN' ) ) { $sql['join'] = str_replace( 'INNER JOIN', 'LEFT JOIN', $sql['join'] ); } /** * Filter the meta query's generated SQL. * * @since 3.1.0 * * @param array $args { * An array of meta query SQL arguments. * * @type array $clauses Array containing the query's JOIN and WHERE clauses. * @type array $queries Array of meta queries. * @type string $type Type of meta. * @type string $primary_table Primary table. * @type string $primary_id_column Primary column ID. * @type object $context The main query object. * } */ return apply_filters_ref_array( 'get_meta_sql', array( $sql, $this->queries, $type, $primary_table, $primary_id_column, $context ) ); } /** * Generate SQL clauses to be appended to a main query. * * Called by the public {@see WP_Meta_Query::get_sql()}, this method * is abstracted out to maintain parity with the other Query classes. * * @since 4.1.0 * @access protected * * @return array { * Array containing JOIN and WHERE SQL clauses to append to the main query. * * @type string $join SQL fragment to append to the main JOIN clause. * @type string $where SQL fragment to append to the main WHERE clause. * } */ protected function get_sql_clauses() { /* * $queries are passed by reference to get_sql_for_query() for recursion. * To keep $this->queries unaltered, pass a copy. */ $queries = $this->queries; $sql = $this->get_sql_for_query( $queries ); if ( ! empty( $sql['where'] ) ) { $sql['where'] = ' AND ' . $sql['where']; } return $sql; } /** * Generate SQL clauses for a single query array. * * If nested subqueries are found, this method recurses the tree to * produce the properly nested SQL. * * @since 4.1.0 * @access protected * * @param array $query Query to parse, passed by reference. * @param int $depth Optional. Number of tree levels deep we currently are. * Used to calculate indentation. Default 0. * @return array { * Array containing JOIN and WHERE SQL clauses to append to a single query array. * * @type string $join SQL fragment to append to the main JOIN clause. * @type string $where SQL fragment to append to the main WHERE clause. * } */ protected function get_sql_for_query( &$query, $depth = 0 ) { $sql_chunks = array( 'join' => array(), 'where' => array(), ); $sql = array( 'join' => '', 'where' => '', ); $indent = ''; for ( $i = 0; $i < $depth; $i++ ) { $indent .= " "; } foreach ( $query as $key => &$clause ) { if ( 'relation' === $key ) { $relation = $query['relation']; } elseif ( is_array( $clause ) ) { // This is a first-order clause. if ( $this->is_first_order_clause( $clause ) ) { $clause_sql = $this->get_sql_for_clause( $clause, $query, $key ); $where_count = count( $clause_sql['where'] ); if ( ! $where_count ) { $sql_chunks['where'][] = ''; } elseif ( 1 === $where_count ) { $sql_chunks['where'][] = $clause_sql['where'][0]; } else { $sql_chunks['where'][] = '( ' . implode( ' AND ', $clause_sql['where'] ) . ' )'; } $sql_chunks['join'] = array_merge( $sql_chunks['join'], $clause_sql['join'] ); // This is a subquery, so we recurse. } else { $clause_sql = $this->get_sql_for_query( $clause, $depth + 1 ); $sql_chunks['where'][] = $clause_sql['where']; $sql_chunks['join'][] = $clause_sql['join']; } } } // Filter to remove empties. $sql_chunks['join'] = array_filter( $sql_chunks['join'] ); $sql_chunks['where'] = array_filter( $sql_chunks['where'] ); if ( empty( $relation ) ) { $relation = 'AND'; } // Filter duplicate JOIN clauses and combine into a single string. if ( ! empty( $sql_chunks['join'] ) ) { $sql['join'] = implode( ' ', array_unique( $sql_chunks['join'] ) ); } // Generate a single WHERE clause with proper brackets and indentation. if ( ! empty( $sql_chunks['where'] ) ) { $sql['where'] = '( ' . "\n " . $indent . implode( ' ' . "\n " . $indent . $relation . ' ' . "\n " . $indent, $sql_chunks['where'] ) . "\n" . $indent . ')'; } return $sql; } /** * Generate SQL JOIN and WHERE clauses for a first-order query clause. * * "First-order" means that it's an array with a 'key' or 'value'. * * @since 4.1.0 * @access public * * @param array $clause Query clause, passed by reference. * @param array $parent_query Parent query array. * @param string $clause_key Optional. The array key used to name the clause in the original `$meta_query` * parameters. If not provided, a key will be generated automatically. * @return array { * Array containing JOIN and WHERE SQL clauses to append to a first-order query. * * @type string $join SQL fragment to append to the main JOIN clause. * @type string $where SQL fragment to append to the main WHERE clause. * } */ public function get_sql_for_clause( &$clause, $parent_query, $clause_key = '' ) { global $wpdb; $sql_chunks = array( 'where' => array(), 'join' => array(), ); if ( isset( $clause['compare'] ) ) { $clause['compare'] = strtoupper( $clause['compare'] ); } else { $clause['compare'] = isset( $clause['value'] ) && is_array( $clause['value'] ) ? 'IN' : '='; } if ( ! in_array( $clause['compare'], array( '=', '!=', '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE', 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN', 'EXISTS', 'NOT EXISTS', 'REGEXP', 'NOT REGEXP', 'RLIKE' ) ) ) { $clause['compare'] = '='; } $meta_compare = $clause['compare']; // First build the JOIN clause, if one is required. $join = ''; // We prefer to avoid joins if possible. Look for an existing join compatible with this clause. $alias = $this->find_compatible_table_alias( $clause, $parent_query ); if ( false === $alias ) { $i = count( $this->table_aliases ); $alias = $i ? 'mt' . $i : $this->meta_table; // JOIN clauses for NOT EXISTS have their own syntax. if ( 'NOT EXISTS' === $meta_compare ) { $join .= " LEFT JOIN $this->meta_table"; $join .= $i ? " AS $alias" : ''; $join .= $wpdb->prepare( " ON ($this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column AND $alias.meta_key = %s )", $clause['key'] ); // All other JOIN clauses. } else { $join .= " INNER JOIN $this->meta_table"; $join .= $i ? " AS $alias" : ''; $join .= " ON ( $this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column )"; } $this->table_aliases[] = $alias; $sql_chunks['join'][] = $join; } // Save the alias to this clause, for future siblings to find. $clause['alias'] = $alias; // Determine the data type. $_meta_type = isset( $clause['type'] ) ? $clause['type'] : ''; $meta_type = $this->get_cast_for_type( $_meta_type ); $clause['cast'] = $meta_type; // Fallback for clause keys is the table alias. if ( ! $clause_key ) { $clause_key = $clause['alias']; } // Ensure unique clause keys, so none are overwritten. $iterator = 1; $clause_key_base = $clause_key; while ( isset( $this->clauses[ $clause_key ] ) ) { $clause_key = $clause_key_base . '-' . $iterator; $iterator++; } // Store the clause in our flat array. $this->clauses[ $clause_key ] =& $clause; // Next, build the WHERE clause. // meta_key. if ( array_key_exists( 'key', $clause ) ) { if ( 'NOT EXISTS' === $meta_compare ) { $sql_chunks['where'][] = $alias . '.' . $this->meta_id_column . ' IS NULL'; } else { $sql_chunks['where'][] = $wpdb->prepare( "$alias.meta_key = %s", trim( $clause['key'] ) ); } } // meta_value. if ( array_key_exists( 'value', $clause ) ) { $meta_value = $clause['value']; if ( in_array( $meta_compare, array( 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ) ) ) { if ( ! is_array( $meta_value ) ) { $meta_value = preg_split( '/[,\s]+/', $meta_value ); } } else { $meta_value = trim( $meta_value ); } switch ( $meta_compare ) { case 'IN' : case 'NOT IN' : $meta_compare_string = '(' . substr( str_repeat( ',%s', count( $meta_value ) ), 1 ) . ')'; $where = $wpdb->prepare( $meta_compare_string, $meta_value ); break; case 'BETWEEN' : case 'NOT BETWEEN' : $meta_value = array_slice( $meta_value, 0, 2 ); $where = $wpdb->prepare( '%s AND %s', $meta_value ); break; case 'LIKE' : case 'NOT LIKE' : $meta_value = '%' . $wpdb->esc_like( $meta_value ) . '%'; $where = $wpdb->prepare( '%s', $meta_value ); break; // EXISTS with a value is interpreted as '='. case 'EXISTS' : $meta_compare = '='; $where = $wpdb->prepare( '%s', $meta_value ); break; // 'value' is ignored for NOT EXISTS. case 'NOT EXISTS' : $where = ''; break; default : $where = $wpdb->prepare( '%s', $meta_value ); break; } if ( $where ) { $sql_chunks['where'][] = "CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$where}"; } } /* * Multiple WHERE clauses (for meta_key and meta_value) should * be joined in parentheses. */ if ( 1 < count( $sql_chunks['where'] ) ) { $sql_chunks['where'] = array( '( ' . implode( ' AND ', $sql_chunks['where'] ) . ' )' ); } return $sql_chunks; } /** * Get a flattened list of sanitized meta clauses. * * This array should be used for clause lookup, as when the table alias and CAST type must be determined for * a value of 'orderby' corresponding to a meta clause. * * @since 4.2.0 * @access public * * @return array Meta clauses. */ public function get_clauses() { return $this->clauses; } /** * Identify an existing table alias that is compatible with the current * query clause. * * We avoid unnecessary table joins by allowing each clause to look for * an existing table alias that is compatible with the query that it * needs to perform. * * An existing alias is compatible if (a) it is a sibling of `$clause` * (ie, it's under the scope of the same relation), and (b) the combination * of operator and relation between the clauses allows for a shared table join. * In the case of {@see WP_Meta_Query}, this only applies to 'IN' clauses that * are connected by the relation 'OR'. * * @since 4.1.0 * @access protected * * @param array $clause Query clause. * @param array $parent_query Parent query of $clause. * @return string|bool Table alias if found, otherwise false. */ protected function find_compatible_table_alias( $clause, $parent_query ) { $alias = false; foreach ( $parent_query as $sibling ) { // If the sibling has no alias yet, there's nothing to check. if ( empty( $sibling['alias'] ) ) { continue; } // We're only interested in siblings that are first-order clauses. if ( ! is_array( $sibling ) || ! $this->is_first_order_clause( $sibling ) ) { continue; } $compatible_compares = array(); // Clauses connected by OR can share joins as long as they have "positive" operators. if ( 'OR' === $parent_query['relation'] ) { $compatible_compares = array( '=', 'IN', 'BETWEEN', 'LIKE', 'REGEXP', 'RLIKE', '>', '>=', '<', '<=' ); // Clauses joined by AND with "negative" operators share a join only if they also share a key. } elseif ( isset( $sibling['key'] ) && isset( $clause['key'] ) && $sibling['key'] === $clause['key'] ) { $compatible_compares = array( '!=', 'NOT IN', 'NOT LIKE' ); } $clause_compare = strtoupper( $clause['compare'] ); $sibling_compare = strtoupper( $sibling['compare'] ); if ( in_array( $clause_compare, $compatible_compares ) && in_array( $sibling_compare, $compatible_compares ) ) { $alias = $sibling['alias']; break; } } /** * Filter the table alias identified as compatible with the current clause. * * @since 4.1.0 * * @param string|bool $alias Table alias, or false if none was found. * @param array $clause First-order query clause. * @param array $parent_query Parent of $clause. * @param object $this WP_Meta_Query object. */ return apply_filters( 'meta_query_find_compatible_table_alias', $alias, $clause, $parent_query, $this ) ; } } /** * Retrieve the name of the metadata table for the specified object type. * * @since 2.9.0 * * @global wpdb $wpdb WordPress database abstraction object. * * @param string $type Type of object to get metadata table for (e.g., comment, post, or user) * @return mixed Metadata table name, or false if no metadata table exists */ function _get_meta_table($type) { global $wpdb; $table_name = $type . 'meta'; if ( empty($wpdb->$table_name) ) return false; return $wpdb->$table_name; } /** * Determine whether a meta key is protected. * * @since 3.1.3 * * @param string $meta_key Meta key * @param string|null $meta_type * @return bool True if the key is protected, false otherwise. */ function is_protected_meta( $meta_key, $meta_type = null ) { $protected = ( '_' == $meta_key[0] ); /** * Filter whether a meta key is protected. * * @since 3.2.0 * * @param bool $protected Whether the key is protected. Default false. * @param string $meta_key Meta key. * @param string $meta_type Meta type. */ return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type ); } /** * Sanitize meta value. * * @since 3.1.3 * * @param string $meta_key Meta key * @param mixed $meta_value Meta value to sanitize * @param string $meta_type Type of meta * @return mixed Sanitized $meta_value */ function sanitize_meta( $meta_key, $meta_value, $meta_type ) { /** * Filter the sanitization of a specific meta key of a specific meta type. * * The dynamic portions of the hook name, `$meta_type`, and `$meta_key`, * refer to the metadata object type (comment, post, or user) and the meta * key value, * respectively. * * @since 3.3.0 * * @param mixed $meta_value Meta value to sanitize. * @param string $meta_key Meta key. * @param string $meta_type Meta type. */ return apply_filters( "sanitize_{$meta_type}_meta_{$meta_key}", $meta_value, $meta_key, $meta_type ); } /** * Register meta key * * @since 3.3.0 * * @param string $meta_type Type of meta * @param string $meta_key Meta key * @param string|array $sanitize_callback A function or method to call when sanitizing the value of $meta_key. * @param string|array $auth_callback Optional. A function or method to call when performing edit_post_meta, add_post_meta, and delete_post_meta capability checks. */ function register_meta( $meta_type, $meta_key, $sanitize_callback, $auth_callback = null ) { if ( is_callable( $sanitize_callback ) ) add_filter( "sanitize_{$meta_type}_meta_{$meta_key}", $sanitize_callback, 10, 3 ); if ( empty( $auth_callback ) ) { if ( is_protected_meta( $meta_key, $meta_type ) ) $auth_callback = '__return_false'; else $auth_callback = '__return_true'; } if ( is_callable( $auth_callback ) ) add_filter( "auth_{$meta_type}_meta_{$meta_key}", $auth_callback, 10, 6 ); }
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