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How to use Meta class

Best Cucumber Common Library code snippet using Meta
meta.php
Source:meta.php
1<?php2/**3 * Metadata API4 *5 * Functions for retrieving and manipulating metadata of various WordPress object types. Metadata6 * for an object is a represented by a simple key-value pair. Objects may contain multiple7 * metadata entries that share the same key and differ only in their value.8 *9 * @package WordPress10 * @subpackage Meta11 * @since 2.9.012 */13/**14 * Add metadata for the specified object.15 *16 * @since 2.9.017 * @uses $wpdb WordPress database object for queries.18 * @uses do_action() Calls 'added_{$meta_type}_meta' with meta_id of added metadata entry,19 * 		object ID, meta key, and meta value20 *21 * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)22 * @param int $object_id ID of the object metadata is for23 * @param string $meta_key Metadata key24 * @param mixed $meta_value Metadata value. Must be serializable if non-scalar.25 * @param bool $unique Optional, default is false. Whether the specified metadata key should be26 * 		unique for the object. If true, and the object already has a value for the specified27 * 		metadata key, no change will be made28 * @return int|bool The meta ID on successful update, false on failure.29 */30function add_metadata($meta_type, $object_id, $meta_key, $meta_value, $unique = false) {31	if ( !$meta_type || !$meta_key )32		return false;33	if ( !$object_id = absint($object_id) )34		return false;35	if ( ! $table = _get_meta_table($meta_type) )36		return false;37	global $wpdb;38	$column = sanitize_key($meta_type . '_id');39	// expected_slashed ($meta_key)40	$meta_key = wp_unslash($meta_key);41	$meta_value = wp_unslash($meta_value);42	$meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type );43	$check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique );44	if ( null !== $check )45		return $check;46	if ( $unique && $wpdb->get_var( $wpdb->prepare(47		"SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d",48		$meta_key, $object_id ) ) )49		return false;50	$_meta_value = $meta_value;51	$meta_value = maybe_serialize( $meta_value );52	do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value );53	$result = $wpdb->insert( $table, array(54		$column => $object_id,55		'meta_key' => $meta_key,56		'meta_value' => $meta_value57	) );58	if ( ! $result )59		return false;60	$mid = (int) $wpdb->insert_id;61	wp_cache_delete($object_id, $meta_type . '_meta');62	do_action( "added_{$meta_type}_meta", $mid, $object_id, $meta_key, $_meta_value );63	return $mid;64}65/**66 * Update metadata for the specified object. If no value already exists for the specified object67 * ID and metadata key, the metadata will be added.68 *69 * @since 2.9.070 * @uses $wpdb WordPress database object for queries.71 * @uses do_action() Calls 'update_{$meta_type}_meta' before updating metadata with meta_id of72 * 		metadata entry to update, object ID, meta key, and meta value73 * @uses do_action() Calls 'updated_{$meta_type}_meta' after updating metadata with meta_id of74 * 		updated metadata entry, object ID, meta key, and meta value75 *76 * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)77 * @param int $object_id ID of the object metadata is for78 * @param string $meta_key Metadata key79 * @param mixed $meta_value Metadata value. Must be serializable if non-scalar.80 * @param mixed $prev_value Optional. If specified, only update existing metadata entries with81 * 		the specified value. Otherwise, update all entries.82 * @return bool True on successful update, false on failure.83 */84function update_metadata($meta_type, $object_id, $meta_key, $meta_value, $prev_value = '') {85	if ( !$meta_type || !$meta_key )86		return false;87	if ( !$object_id = absint($object_id) )88		return false;89	if ( ! $table = _get_meta_table($meta_type) )90		return false;91	global $wpdb;92	$column = sanitize_key($meta_type . '_id');93	$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';94	// expected_slashed ($meta_key)95	$meta_key = wp_unslash($meta_key);96	$passed_value = $meta_value;97	$meta_value = wp_unslash($meta_value);98	$meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type );99	$check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value );100	if ( null !== $check )101		return (bool) $check;102	// Compare existing value to new value if no prev value given and the key exists only once.103	if ( empty($prev_value) ) {104		$old_value = get_metadata($meta_type, $object_id, $meta_key);105		if ( count($old_value) == 1 ) {106			if ( $old_value[0] === $meta_value )107				return false;108		}109	}110	if ( ! $meta_id = $wpdb->get_var( $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s AND $column = %d", $meta_key, $object_id ) ) )111		return add_metadata($meta_type, $object_id, $meta_key, $passed_value);112	$_meta_value = $meta_value;113	$meta_value = maybe_serialize( $meta_value );114	$data  = compact( 'meta_value' );115	$where = array( $column => $object_id, 'meta_key' => $meta_key );116	if ( !empty( $prev_value ) ) {117		$prev_value = maybe_serialize($prev_value);118		$where['meta_value'] = $prev_value;119	}120	do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value );121	if ( 'post' == $meta_type )122		do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value );123	$result = $wpdb->update( $table, $data, $where );124	if ( ! $result )125		return false;126	wp_cache_delete($object_id, $meta_type . '_meta');127	do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value );128	if ( 'post' == $meta_type )129		do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value );130	return true;131}132/**133 * Delete metadata for the specified object.134 *135 * @since 2.9.0136 * @uses $wpdb WordPress database object for queries.137 * @uses do_action() Calls 'deleted_{$meta_type}_meta' after deleting with meta_id of138 * 		deleted metadata entries, object ID, meta key, and meta value139 *140 * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)141 * @param int $object_id ID of the object metadata is for142 * @param string $meta_key Metadata key143 * @param mixed $meta_value Optional. Metadata value. Must be serializable if non-scalar. If specified, only delete metadata entries144 * 		with this value. Otherwise, delete all entries with the specified meta_key.145 * @param bool $delete_all Optional, default is false. If true, delete matching metadata entries146 * 		for all objects, ignoring the specified object_id. Otherwise, only delete matching147 * 		metadata entries for the specified object_id.148 * @return bool True on successful delete, false on failure.149 */150function delete_metadata($meta_type, $object_id, $meta_key, $meta_value = '', $delete_all = false) {151	if ( !$meta_type || !$meta_key )152		return false;153	if ( (!$object_id = absint($object_id)) && !$delete_all )154		return false;155	if ( ! $table = _get_meta_table($meta_type) )156		return false;157	global $wpdb;158	$type_column = sanitize_key($meta_type . '_id');159	$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';160	// expected_slashed ($meta_key)161	$meta_key = wp_unslash($meta_key);162	$meta_value = wp_unslash($meta_value);163	$check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all );164	if ( null !== $check )165		return (bool) $check;166	$_meta_value = $meta_value;167	$meta_value = maybe_serialize( $meta_value );168	$query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key );169	if ( !$delete_all )170		$query .= $wpdb->prepare(" AND $type_column = %d", $object_id );171	if ( $meta_value )172		$query .= $wpdb->prepare(" AND meta_value = %s", $meta_value );173	$meta_ids = $wpdb->get_col( $query );174	if ( !count( $meta_ids ) )175		return false;176	if ( $delete_all )177		$object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s", $meta_key ) );178	do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value );179	// Old-style action.180	if ( 'post' == $meta_type )181		do_action( 'delete_postmeta', $meta_ids );182	$query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . " )";183	$count = $wpdb->query($query);184	if ( !$count )185		return false;186	if ( $delete_all ) {187		foreach ( (array) $object_ids as $o_id ) {188			wp_cache_delete($o_id, $meta_type . '_meta');189		}190	} else {191		wp_cache_delete($object_id, $meta_type . '_meta');192	}193	do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value );194	// Old-style action.195	if ( 'post' == $meta_type )196		do_action( 'deleted_postmeta', $meta_ids );197	return true;198}199/**200 * Retrieve metadata for the specified object.201 *202 * @since 2.9.0203 *204 * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)205 * @param int $object_id ID of the object metadata is for206 * @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for207 * 		the specified object.208 * @param bool $single Optional, default is false. If true, return only the first value of the209 * 		specified meta_key. This parameter has no effect if meta_key is not specified.210 * @return string|array Single metadata value, or array of values211 */212function get_metadata($meta_type, $object_id, $meta_key = '', $single = false) {213	if ( !$meta_type )214		return false;215	if ( !$object_id = absint($object_id) )216		return false;217	$check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single );218	if ( null !== $check ) {219		if ( $single && is_array( $check ) )220			return $check[0];221		else222			return $check;223	}224	$meta_cache = wp_cache_get($object_id, $meta_type . '_meta');225	if ( !$meta_cache ) {226		$meta_cache = update_meta_cache( $meta_type, array( $object_id ) );227		$meta_cache = $meta_cache[$object_id];228	}229	if ( !$meta_key )230		return $meta_cache;231	if ( isset($meta_cache[$meta_key]) ) {232		if ( $single )233			return maybe_unserialize( $meta_cache[$meta_key][0] );234		else235			return array_map('maybe_unserialize', $meta_cache[$meta_key]);236	}237	if ($single)238		return '';239	else240		return array();241}242/**243 * Determine if a meta key is set for a given object244 *245 * @since 3.3.0246 *247 * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)248 * @param int $object_id ID of the object metadata is for249 * @param string $meta_key Metadata key.250 * @return boolean true of the key is set, false if not.251 */252function metadata_exists( $meta_type, $object_id, $meta_key ) {253	if ( ! $meta_type )254		return false;255	if ( ! $object_id = absint( $object_id ) )256		return false;257	$check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true );258	if ( null !== $check )259		return true;260	$meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' );261	if ( !$meta_cache ) {262		$meta_cache = update_meta_cache( $meta_type, array( $object_id ) );263		$meta_cache = $meta_cache[$object_id];264	}265	if ( isset( $meta_cache[ $meta_key ] ) )266		return true;267	return false;268}269/**270 * Get meta data by meta ID271 *272 * @since 3.3.0273 *274 * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)275 * @param int $meta_id ID for a specific meta row276 * @return object Meta object or false.277 */278function get_metadata_by_mid( $meta_type, $meta_id ) {279	global $wpdb;280	if ( ! $meta_type )281		return false;282	if ( !$meta_id = absint( $meta_id ) )283		return false;284	if ( ! $table = _get_meta_table($meta_type) )285		return false;286	$id_column = ( 'user' == $meta_type ) ? 'umeta_id' : 'meta_id';287	$meta = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $table WHERE $id_column = %d", $meta_id ) );288	if ( empty( $meta ) )289		return false;290	if ( isset( $meta->meta_value ) )291		$meta->meta_value = maybe_unserialize( $meta->meta_value );292	return $meta;293}294/**295 * Update meta data by meta ID296 *297 * @since 3.3.0298 *299 * @uses get_metadata_by_mid() Calls get_metadata_by_mid() to fetch the meta key, value300 *		and object_id of the given meta_id.301 *302 * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)303 * @param int $meta_id ID for a specific meta row304 * @param string $meta_value Metadata value305 * @param string $meta_key Optional, you can provide a meta key to update it306 * @return bool True on successful update, false on failure.307 */308function update_metadata_by_mid( $meta_type, $meta_id, $meta_value, $meta_key = false ) {309	global $wpdb;310	// Make sure everything is valid.311	if ( ! $meta_type )312		return false;313	if ( ! $meta_id = absint( $meta_id ) )314		return false;315	if ( ! $table = _get_meta_table( $meta_type ) )316		return false;317	$column = sanitize_key($meta_type . '_id');318	$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';319	// Fetch the meta and go on if it's found.320	if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) {321		$original_key = $meta->meta_key;322		$original_value = $meta->meta_value;323		$object_id = $meta->{$column};324		// If a new meta_key (last parameter) was specified, change the meta key,325		// otherwise use the original key in the update statement.326		if ( false === $meta_key ) {327			$meta_key = $original_key;328		} elseif ( ! is_string( $meta_key ) ) {329			return false;330		}331		// Sanitize the meta332		$_meta_value = $meta_value;333		$meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type );334		$meta_value = maybe_serialize( $meta_value );335		// Format the data query arguments.336		$data = array(337			'meta_key' => $meta_key,338			'meta_value' => $meta_value339		);340		// Format the where query arguments.341		$where = array();342		$where[$id_column] = $meta_id;343		do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value );344		if ( 'post' == $meta_type )345			do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value );346		// Run the update query, all fields in $data are %s, $where is a %d.347		$result = $wpdb->update( $table, $data, $where, '%s', '%d' );348		if ( ! $result )349			return false;350		// Clear the caches.351		wp_cache_delete($object_id, $meta_type . '_meta');352		do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value );353		if ( 'post' == $meta_type )354			do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value );355		return true;356	}357	// And if the meta was not found.358	return false;359}360/**361 * Delete meta data by meta ID362 *363 * @since 3.3.0364 *365 * @uses get_metadata_by_mid() Calls get_metadata_by_mid() to fetch the meta key, value366 *		and object_id of the given meta_id.367 *368 * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)369 * @param int $meta_id ID for a specific meta row370 * @return bool True on successful delete, false on failure.371 */372function delete_metadata_by_mid( $meta_type, $meta_id ) {373	global $wpdb;374	// Make sure everything is valid.375	if ( ! $meta_type )376		return false;377	if ( ! $meta_id = absint( $meta_id ) )378		return false;379	if ( ! $table = _get_meta_table( $meta_type ) )380		return false;381	// object and id columns382	$column = sanitize_key($meta_type . '_id');383	$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';384	// Fetch the meta and go on if it's found.385	if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) {386		$object_id = $meta->{$column};387		do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value );388		// Old-style action.389		if ( 'post' == $meta_type || 'comment' == $meta_type )390			do_action( "delete_{$meta_type}meta", $meta_id );391		// Run the query, will return true if deleted, false otherwise392		$result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) );393		// Clear the caches.394		wp_cache_delete($object_id, $meta_type . '_meta');395		do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value );396		// Old-style action.397		if ( 'post' == $meta_type || 'comment' == $meta_type )398			do_action( "deleted_{$meta_type}meta", $meta_id );399		return $result;400	}401	// Meta id was not found.402	return false;403}404/**405 * Update the metadata cache for the specified objects.406 *407 * @since 2.9.0408 * @uses $wpdb WordPress database object for queries.409 *410 * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)411 * @param int|array $object_ids array or comma delimited list of object IDs to update cache for412 * @return mixed Metadata cache for the specified objects, or false on failure.413 */414function update_meta_cache($meta_type, $object_ids) {415	if ( empty( $meta_type ) || empty( $object_ids ) )416		return false;417	if ( ! $table = _get_meta_table($meta_type) )418		return false;419	$column = sanitize_key($meta_type . '_id');420	global $wpdb;421	if ( !is_array($object_ids) ) {422		$object_ids = preg_replace('|[^0-9,]|', '', $object_ids);423		$object_ids = explode(',', $object_ids);424	}425	$object_ids = array_map('intval', $object_ids);426	$cache_key = $meta_type . '_meta';427	$ids = array();428	$cache = array();429	foreach ( $object_ids as $id ) {430		$cached_object = wp_cache_get( $id, $cache_key );431		if ( false === $cached_object )432			$ids[] = $id;433		else434			$cache[$id] = $cached_object;435	}436	if ( empty( $ids ) )437		return $cache;438	// Get meta info439	$id_list = join( ',', $ids );440	$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';441	$meta_list = $wpdb->get_results( "SELECT $column, meta_key, meta_value FROM $table WHERE $column IN ($id_list) ORDER BY $id_column ASC", ARRAY_A );442	if ( !empty($meta_list) ) {443		foreach ( $meta_list as $metarow) {444			$mpid = intval($metarow[$column]);445			$mkey = $metarow['meta_key'];446			$mval = $metarow['meta_value'];447			// Force subkeys to be array type:448			if ( !isset($cache[$mpid]) || !is_array($cache[$mpid]) )449				$cache[$mpid] = array();450			if ( !isset($cache[$mpid][$mkey]) || !is_array($cache[$mpid][$mkey]) )451				$cache[$mpid][$mkey] = array();452			// Add a value to the current pid/key:453			$cache[$mpid][$mkey][] = $mval;454		}455	}456	foreach ( $ids as $id ) {457		if ( ! isset($cache[$id]) )458			$cache[$id] = array();459		wp_cache_add( $id, $cache[$id], $cache_key );460	}461	return $cache;462}463/**464 * Given a meta query, generates SQL clauses to be appended to a main query465 *466 * @since 3.2.0467 *468 * @see WP_Meta_Query469 *470 * @param array $meta_query A meta query471 * @param string $type Type of meta472 * @param string $primary_table473 * @param string $primary_id_column474 * @param object $context (optional) The main query object475 * @return array( 'join' => $join_sql, 'where' => $where_sql )476 */477function get_meta_sql( $meta_query, $type, $primary_table, $primary_id_column, $context = null ) {478	$meta_query_obj = new WP_Meta_Query( $meta_query );479	return $meta_query_obj->get_sql( $type, $primary_table, $primary_id_column, $context );480}481/**482 * Container class for a multiple metadata query483 *484 * @since 3.2.0485 */486class WP_Meta_Query {487	/**488	* List of metadata queries. A single query is an associative array:489	* - 'key' string The meta key490	* - 'value' string|array The meta value491	* - 'compare' (optional) string How to compare the key to the value.492	*              Possible values: '=', '!=', '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE', 'IN', 'NOT IN',493	*              'BETWEEN', 'NOT BETWEEN', 'REGEXP', 'NOT REGEXP', 'RLIKE'.494	*              Default: '='495	* - 'type' string (optional) The type of the value.496	*              Possible values: 'NUMERIC', 'BINARY', 'CHAR', 'DATE', 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', 'UNSIGNED'.497	*              Default: 'CHAR'498	*499	* @since 3.2.0500	* @access public501	* @var array502	*/503	public $queries = array();504	/**505	 * The relation between the queries. Can be one of 'AND' or 'OR'.506	 *507	 * @since 3.2.0508	 * @access public509	 * @var string510	 */511	public $relation;512	/**513	 * Constructor514	 *515	 * @param array $meta_query (optional) A meta query516	 */517	function __construct( $meta_query = false ) {518		if ( !$meta_query )519			return;520		if ( isset( $meta_query['relation'] ) && strtoupper( $meta_query['relation'] ) == 'OR' ) {521			$this->relation = 'OR';522		} else {523			$this->relation = 'AND';524		}525		$this->queries = array();526		foreach ( $meta_query as $key => $query ) {527			if ( ! is_array( $query ) )528				continue;529			$this->queries[] = $query;530		}531	}532	/**533	 * Constructs a meta query based on 'meta_*' query vars534	 *535	 * @since 3.2.0536	 * @access public537	 *538	 * @param array $qv The query variables539	 */540	function parse_query_vars( $qv ) {541		$meta_query = array();542		// Simple query needs to be first for orderby=meta_value to work correctly543		foreach ( array( 'key', 'compare', 'type' ) as $key ) {544			if ( !empty( $qv[ "meta_$key" ] ) )545				$meta_query[0][ $key ] = $qv[ "meta_$key" ];546		}547		// WP_Query sets 'meta_value' = '' by default548		if ( isset( $qv[ 'meta_value' ] ) && '' !== $qv[ 'meta_value' ] && ( ! is_array( $qv[ 'meta_value' ] ) || $qv[ 'meta_value' ] ) )549			$meta_query[0]['value'] = $qv[ 'meta_value' ];550		if ( !empty( $qv['meta_query'] ) && is_array( $qv['meta_query'] ) ) {551			$meta_query = array_merge( $meta_query, $qv['meta_query'] );552		}553		$this->__construct( $meta_query );554	}555	/**556	 * Given a meta type, return the appropriate alias if applicable557	 *558	 * @since 3.7.0559	 *560	 * @param string $type MySQL type to cast meta_value561	 * @return string MySQL type562	 */563	function get_cast_for_type( $type = '' ) {564		if ( empty( $type ) )565			return 'CHAR';566		$meta_type = strtoupper( $type );567		if ( ! preg_match( '/^(?:BINARY|CHAR|DATE|DATETIME|SIGNED|UNSIGNED|TIME|NUMERIC(?:\(\d+(?:,\s?\d+)?\))?|DECIMAL(?:\(\d+(?:,\s?\d+)?\))?)$/', $meta_type ) )568			return 'CHAR';569		if ( 'NUMERIC' == $meta_type )570			$meta_type = 'SIGNED';571		return $meta_type;572	}573	/**574	 * Generates SQL clauses to be appended to a main query.575	 *576	 * @since 3.2.0577	 * @access public578	 *579	 * @param string $type Type of meta580	 * @param string $primary_table581	 * @param string $primary_id_column582	 * @param object $context (optional) The main query object583	 * @return array( 'join' => $join_sql, 'where' => $where_sql )584	 */585	function get_sql( $type, $primary_table, $primary_id_column, $context = null ) {586		global $wpdb;587		if ( ! $meta_table = _get_meta_table( $type ) )588			return false;589		$meta_id_column = sanitize_key( $type . '_id' );590		$join = array();591		$where = array();592		$key_only_queries = array();593		$queries = array();594		// Split out the queries with empty arrays as value595		foreach ( $this->queries as $k => $q ) {596			if ( isset( $q['value'] ) && is_array( $q['value'] ) && empty( $q['value'] ) ) {597				$key_only_queries[$k] = $q;598				unset( $this->queries[$k] );599			}600		}601		// Split out the meta_key only queries (we can only do this for OR)602		if ( 'OR' == $this->relation ) {603			foreach ( $this->queries as $k => $q ) {604				if ( ! array_key_exists( 'value', $q ) && ! empty( $q['key'] ) )605					$key_only_queries[$k] = $q;606				else607					$queries[$k] = $q;608			}609		} else {610			$queries = $this->queries;611		}612		// Specify all the meta_key only queries in one go613		if ( $key_only_queries ) {614			$join[]  = "INNER JOIN $meta_table ON $primary_table.$primary_id_column = $meta_table.$meta_id_column";615			foreach ( $key_only_queries as $key => $q )616				$where["key-only-$key"] = $wpdb->prepare( "$meta_table.meta_key = %s", trim( $q['key'] ) );617		}618		foreach ( $queries as $k => $q ) {619			$meta_key = isset( $q['key'] ) ? trim( $q['key'] ) : '';620			$meta_type = $this->get_cast_for_type( isset( $q['type'] ) ? $q['type'] : '' );621			if ( array_key_exists( 'value', $q ) && is_null( $q['value'] ) )622				$q['value'] = '';623			$meta_value = isset( $q['value'] ) ? $q['value'] : null;624			if ( isset( $q['compare'] ) )625				$meta_compare = strtoupper( $q['compare'] );626			else627				$meta_compare = is_array( $meta_value ) ? 'IN' : '=';628			if ( ! in_array( $meta_compare, array(629				'=', '!=', '>', '>=', '<', '<=',630				'LIKE', 'NOT LIKE',631				'IN', 'NOT IN',632				'BETWEEN', 'NOT BETWEEN',633				'NOT EXISTS',634				'REGEXP', 'NOT REGEXP', 'RLIKE'635			) ) )636				$meta_compare = '=';637			$i = count( $join );638			$alias = $i ? 'mt' . $i : $meta_table;639			if ( 'NOT EXISTS' == $meta_compare ) {640				$join[$i]  = "LEFT JOIN $meta_table";641				$join[$i] .= $i ? " AS $alias" : '';642				$join[$i] .= " ON ($primary_table.$primary_id_column = $alias.$meta_id_column AND $alias.meta_key = '$meta_key')";643				$where[$k] = ' ' . $alias . '.' . $meta_id_column . ' IS NULL';644				continue;645			}646			$join[$i]  = "INNER JOIN $meta_table";647			$join[$i] .= $i ? " AS $alias" : '';648			$join[$i] .= " ON ($primary_table.$primary_id_column = $alias.$meta_id_column)";649			$where[$k] = '';650			if ( !empty( $meta_key ) )651				$where[$k] = $wpdb->prepare( "$alias.meta_key = %s", $meta_key );652			if ( is_null( $meta_value ) ) {653				if ( empty( $where[$k] ) )654					unset( $join[$i] );655				continue;656			}657			if ( in_array( $meta_compare, array( 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ) ) ) {658				if ( ! is_array( $meta_value ) )659					$meta_value = preg_split( '/[,\s]+/', $meta_value );660				if ( empty( $meta_value ) ) {661					unset( $join[$i] );662					continue;663				}664			} else {665				$meta_value = trim( $meta_value );666			}667			if ( 'IN' == substr( $meta_compare, -2) ) {668				$meta_compare_string = '(' . substr( str_repeat( ',%s', count( $meta_value ) ), 1 ) . ')';669			} elseif ( 'BETWEEN' == substr( $meta_compare, -7) ) {670				$meta_value = array_slice( $meta_value, 0, 2 );671				$meta_compare_string = '%s AND %s';672			} elseif ( 'LIKE' == substr( $meta_compare, -4 ) ) {673				$meta_value = '%' . like_escape( $meta_value ) . '%';674				$meta_compare_string = '%s';675			} else {676				$meta_compare_string = '%s';677			}678			if ( ! empty( $where[$k] ) )679				$where[$k] .= ' AND ';680			$where[$k] = ' (' . $where[$k] . $wpdb->prepare( "CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$meta_compare_string})", $meta_value );681		}682		$where = array_filter( $where );683		if ( empty( $where ) )684			$where = '';685		else686			$where = ' AND (' . implode( "\n{$this->relation} ", $where ) . ' )';687		$join = implode( "\n", $join );688		if ( ! empty( $join ) )689			$join = ' ' . $join;690		return apply_filters_ref_array( 'get_meta_sql', array( compact( 'join', 'where' ), $this->queries, $type, $primary_table, $primary_id_column, $context ) );691	}692}693/**694 * Retrieve the name of the metadata table for the specified object type.695 *696 * @since 2.9.0697 * @uses $wpdb WordPress database object for queries.698 *699 * @param string $type Type of object to get metadata table for (e.g., comment, post, or user)700 * @return mixed Metadata table name, or false if no metadata table exists701 */702function _get_meta_table($type) {703	global $wpdb;704	$table_name = $type . 'meta';705	if ( empty($wpdb->$table_name) )706		return false;707	return $wpdb->$table_name;708}709/**710 * Determine whether a meta key is protected711 *712 * @since 3.1.3713 *714 * @param string $meta_key Meta key715 * @return bool True if the key is protected, false otherwise.716 */717function is_protected_meta( $meta_key, $meta_type = null ) {718	$protected = ( '_' == $meta_key[0] );719	return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type );720}721/**722 * Sanitize meta value723 *724 * @since 3.1.3725 *726 * @param string $meta_key Meta key727 * @param mixed $meta_value Meta value to sanitize728 * @param string $meta_type Type of meta729 * @return mixed Sanitized $meta_value730 */731function sanitize_meta( $meta_key, $meta_value, $meta_type ) {732	return apply_filters( "sanitize_{$meta_type}_meta_{$meta_key}", $meta_value, $meta_key, $meta_type );733}734/**735 * Register meta key736 *737 * @since 3.3.0738 *739 * @param string $meta_type Type of meta740 * @param string $meta_key Meta key741 * @param string|array $sanitize_callback A function or method to call when sanitizing the value of $meta_key.742 * @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.743 * @param array $args Arguments744 */745function register_meta( $meta_type, $meta_key, $sanitize_callback, $auth_callback = null ) {746	if ( is_callable( $sanitize_callback ) )747		add_filter( "sanitize_{$meta_type}_meta_{$meta_key}", $sanitize_callback, 10, 3 );748	if ( empty( $auth_callback ) ) {749		if ( is_protected_meta( $meta_key, $meta_type ) )750			$auth_callback = '__return_false';751		else752			$auth_callback = '__return_true';753	}754	if ( is_callable( $auth_callback ) )...
Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.