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/**
 * Metadata API
 *
 * Functions for retrieving and manipulating metadata of various WordPress object types. Metadata
 * for an object is a represented by a simple key-value pair. Objects may contain multiple
 * metadata entries that share the same key and differ only in their value.
 *
 * @package WordPress
 * @subpackage Meta
 * @since 2.9.0
 */

/**
 * Add metadata for the specified object.
 *
 * @since 2.9.0
 * @uses $wpdb WordPress database object for queries.
 *
 * @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 bool $unique Optional, default is false. Whether the specified metadata key should be
 * 		unique for the object. If true, and the object already has a value for the specified
 * 		metadata key, no change will be made
 * @return int|bool The meta ID on success, false on failure.
 */
function add_metadata($meta_type, $object_id, $meta_key, $meta_value, $unique = false) {
	if ( !$meta_type || !$meta_key )
		return false;

	if ( !$object_id = absint($object_id) )
		return false;

	if ( ! $table = _get_meta_table($meta_type) )
		return false;

	global $wpdb;

	$column = sanitize_key($meta_type . &#039;_id&#039;);

	// expected_slashed ($meta_key)
	$meta_key = wp_unslash($meta_key);
	$meta_value = wp_unslash($meta_value);
	$meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type );

	/**
	 * Filter whether to add 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 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.
	 */
	$check = apply_filters( &quot;add_{$meta_type}_metadata&quot;, null, $object_id, $meta_key, $meta_value, $unique );
	if ( null !== $check )
		return $check;

	if ( $unique &amp;&amp; $wpdb-&gt;get_var( $wpdb-&gt;prepare(
		&quot;SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d&quot;,
		$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  $meta_value Meta value.
	 */
	do_action( &quot;add_{$meta_type}_meta&quot;, $object_id, $meta_key, $_meta_value );

	$result = $wpdb-&gt;insert( $table, array(
		$column =&gt; $object_id,
		&#039;meta_key&#039; =&gt; $meta_key,
		&#039;meta_value&#039; =&gt; $meta_value
	) );

	if ( ! $result )
		return false;

	$mid = (int) $wpdb-&gt;insert_id;

	wp_cache_delete($object_id, $meta_type . &#039;_meta&#039;);

	/**
	 * 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  $meta_value Meta value.
	 */
	do_action( &quot;added_{$meta_type}_meta&quot;, $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
 * @uses $wpdb WordPress database object for queries.
 *
 * @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 $prev_value Optional. If specified, only update existing metadata entries with
 * 		the specified value. Otherwise, update all entries.
 * @return int|bool Meta ID if the key didn&#039;t exist, true on successful update, false on failure.
 */
function update_metadata($meta_type, $object_id, $meta_key, $meta_value, $prev_value = &#039;&#039;) {
	if ( !$meta_type || !$meta_key )
		return false;

	if ( !$object_id = absint($object_id) )
		return false;

	if ( ! $table = _get_meta_table($meta_type) )
		return false;

	global $wpdb;

	$column = sanitize_key($meta_type . &#039;_id&#039;);
	$id_column = &#039;user&#039; == $meta_type ? &#039;umeta_id&#039; : &#039;meta_id&#039;;

	// 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.
	 */
	$check = apply_filters( &quot;update_{$meta_type}_metadata&quot;, 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;
		}
	}

	if ( ! $meta_id = $wpdb-&gt;get_var( $wpdb-&gt;prepare( &quot;SELECT $id_column FROM $table WHERE meta_key = %s AND $column = %d&quot;, $meta_key, $object_id ) ) )
		return add_metadata($meta_type, $object_id, $meta_key, $passed_value);

	$_meta_value = $meta_value;
	$meta_value = maybe_serialize( $meta_value );

	$data  = compact( &#039;meta_value&#039; );
	$where = array( $column =&gt; $object_id, &#039;meta_key&#039; =&gt; $meta_key );

	if ( !empty( $prev_value ) ) {
		$prev_value = maybe_serialize($prev_value);
		$where[&#039;meta_value&#039;] = $prev_value;
	}

	/**
	 * 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  $meta_value Meta value.
	 */
	do_action( &quot;update_{$meta_type}_meta&quot;, $meta_id, $object_id, $meta_key, $_meta_value );

	if ( &#039;post&#039; == $meta_type )
		/**
		 * Fires immediately before updating a post&#039;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( &#039;update_postmeta&#039;, $meta_id, $object_id, $meta_key, $meta_value );

	$result = $wpdb-&gt;update( $table, $data, $where );
	if ( ! $result )
		return false;

	wp_cache_delete($object_id, $meta_type . &#039;_meta&#039;);

	/**
	 * 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  $meta_value Meta value.
	 */
	do_action( &quot;updated_{$meta_type}_meta&quot;, $meta_id, $object_id, $meta_key, $_meta_value );

	if ( &#039;post&#039; == $meta_type ) {
		/**
		 * Fires immediately after updating a post&#039;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( &#039;updated_postmeta&#039;, $meta_id, $object_id, $meta_key, $meta_value );
	}

	return true;
}

/**
 * Delete metadata for the specified object.
 *
 * @since 2.9.0
 * @uses $wpdb WordPress database object for queries.
 *
 * @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 = &#039;&#039;, $delete_all = false) {
	if ( !$meta_type || !$meta_key )
		return false;

	if ( (!$object_id = absint($object_id)) &amp;&amp; !$delete_all )
		return false;

	if ( ! $table = _get_meta_table($meta_type) )
		return false;

	global $wpdb;

	$type_column = sanitize_key($meta_type . &#039;_id&#039;);
	$id_column = &#039;user&#039; == $meta_type ? &#039;umeta_id&#039; : &#039;meta_id&#039;;
	// expected_slashed ($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.
	 */
	$check = apply_filters( &quot;delete_{$meta_type}_metadata&quot;, 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-&gt;prepare( &quot;SELECT $id_column FROM $table WHERE meta_key = %s&quot;, $meta_key );

	if ( !$delete_all )
		$query .= $wpdb-&gt;prepare(&quot; AND $type_column = %d&quot;, $object_id );

	if ( $meta_value )
		$query .= $wpdb-&gt;prepare(&quot; AND meta_value = %s&quot;, $meta_value );

	$meta_ids = $wpdb-&gt;get_col( $query );
	if ( !count( $meta_ids ) )
		return false;

	if ( $delete_all )
		$object_ids = $wpdb-&gt;get_col( $wpdb-&gt;prepare( &quot;SELECT $type_column FROM $table WHERE meta_key = %s&quot;, $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  $meta_value Meta value.
	 */
	do_action( &quot;delete_{$meta_type}_meta&quot;, $meta_ids, $object_id, $meta_key, $_meta_value );

	// Old-style action.
	if ( &#039;post&#039; == $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( &#039;delete_postmeta&#039;, $meta_ids );
	}

	$query = &quot;DELETE FROM $table WHERE $id_column IN( &quot; . implode( &#039;,&#039;, $meta_ids ) . &quot; )&quot;;

	$count = $wpdb-&gt;query($query);

	if ( !$count )
		return false;

	if ( $delete_all ) {
		foreach ( (array) $object_ids as $o_id ) {
			wp_cache_delete($o_id, $meta_type . &#039;_meta&#039;);
		}
	} else {
		wp_cache_delete($object_id, $meta_type . &#039;_meta&#039;);
	}

	/**
	 * 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  $meta_value Meta value.
	 */
	do_action( &quot;deleted_{$meta_type}_meta&quot;, $meta_ids, $object_id, $meta_key, $_meta_value );

	// Old-style action.
	if ( &#039;post&#039; == $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( &#039;deleted_postmeta&#039;, $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 $single Optional, default is false. If true, return only the first value of the
 * 		specified meta_key. This parameter has no effect if meta_key is not specified.
 * @return string|array Single metadata value, or array of values
 */
function get_metadata($meta_type, $object_id, $meta_key = &#039;&#039;, $single = false) {
	if ( !$meta_type )
		return false;

	if ( !$object_id = absint($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.
	 */
	$check = apply_filters( &quot;get_{$meta_type}_metadata&quot;, null, $object_id, $meta_key, $single );
	if ( null !== $check ) {
		if ( $single &amp;&amp; is_array( $check ) )
			return $check[0];
		else
			return $check;
	}

	$meta_cache = wp_cache_get($object_id, $meta_type . &#039;_meta&#039;);

	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(&#039;maybe_unserialize&#039;, $meta_cache[$meta_key]);
	}

	if ($single)
		return &#039;&#039;;
	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 )
		return false;

	if ( ! $object_id = absint( $object_id ) )
		return false;

	/** This filter is documented in wp-includes/meta.php */
	$check = apply_filters( &quot;get_{$meta_type}_metadata&quot;, null, $object_id, $meta_key, true );
	if ( null !== $check )
		return (bool) $check;

	$meta_cache = wp_cache_get( $object_id, $meta_type . &#039;_meta&#039; );

	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 )
		return false;

	if ( !$meta_id = absint( $meta_id ) )
		return false;

	if ( ! $table = _get_meta_table($meta_type) )
		return false;

	$id_column = ( &#039;user&#039; == $meta_type ) ? &#039;umeta_id&#039; : &#039;meta_id&#039;;

	$meta = $wpdb-&gt;get_row( $wpdb-&gt;prepare( &quot;SELECT * FROM $table WHERE $id_column = %d&quot;, $meta_id ) );

	if ( empty( $meta ) )
		return false;

	if ( isset( $meta-&gt;meta_value ) )
		$meta-&gt;meta_value = maybe_unserialize( $meta-&gt;meta_value );

	return $meta;
}

/**
 * Update meta data by meta ID
 *
 * @since 3.3.0
 *
 * @uses get_metadata_by_mid() Calls get_metadata_by_mid() to fetch the meta key, value
 *		and object_id of the given meta_id.
 *
 * @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 )
		return false;

	if ( ! $meta_id = absint( $meta_id ) )
		return false;

	if ( ! $table = _get_meta_table( $meta_type ) )
		return false;

	$column = sanitize_key($meta_type . &#039;_id&#039;);
	$id_column = &#039;user&#039; == $meta_type ? &#039;umeta_id&#039; : &#039;meta_id&#039;;

	// Fetch the meta and go on if it&#039;s found.
	if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) {
		$original_key = $meta-&gt;meta_key;
		$original_value = $meta-&gt;meta_value;
		$object_id = $meta-&gt;{$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(
			&#039;meta_key&#039; =&gt; $meta_key,
			&#039;meta_value&#039; =&gt; $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( &quot;update_{$meta_type}_meta&quot;, $meta_id, $object_id, $meta_key, $_meta_value );

		if ( &#039;post&#039; == $meta_type ) {
			/** This action is documented in wp-includes/meta.php */
			do_action( &#039;update_postmeta&#039;, $meta_id, $object_id, $meta_key, $meta_value );
		}

		// Run the update query, all fields in $data are %s, $where is a %d.
		$result = $wpdb-&gt;update( $table, $data, $where, &#039;%s&#039;, &#039;%d&#039; );
		if ( ! $result )
			return false;

		// Clear the caches.
		wp_cache_delete($object_id, $meta_type . &#039;_meta&#039;);

		/** This action is documented in wp-includes/meta.php */
		do_action( &quot;updated_{$meta_type}_meta&quot;, $meta_id, $object_id, $meta_key, $_meta_value );

		if ( &#039;post&#039; == $meta_type ) {
			/** This action is documented in wp-includes/meta.php */
			do_action( &#039;updated_postmeta&#039;, $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
 *
 * @uses get_metadata_by_mid() Calls get_metadata_by_mid() to fetch the meta key, value
 *		and object_id of the given meta_id.
 *
 * @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 )
		return false;

	if ( ! $meta_id = absint( $meta_id ) )
		return false;

	if ( ! $table = _get_meta_table( $meta_type ) )
		return false;

	// object and id columns
	$column = sanitize_key($meta_type . &#039;_id&#039;);
	$id_column = &#039;user&#039; == $meta_type ? &#039;umeta_id&#039; : &#039;meta_id&#039;;

	// Fetch the meta and go on if it&#039;s found.
	if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) {
		$object_id = $meta-&gt;{$column};

		/** This action is documented in wp-includes/meta.php */
		do_action( &quot;delete_{$meta_type}_meta&quot;, (array) $meta_id, $object_id, $meta-&gt;meta_key, $meta-&gt;meta_value );

		// Old-style action.
		if ( &#039;post&#039; == $meta_type || &#039;comment&#039; == $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 $meta_id ID of the metadata entry to delete.
			 */
			do_action( &quot;delete_{$meta_type}meta&quot;, $meta_id );
		}

		// Run the query, will return true if deleted, false otherwise
		$result = (bool) $wpdb-&gt;delete( $table, array( $id_column =&gt; $meta_id ) );

		// Clear the caches.
		wp_cache_delete($object_id, $meta_type . &#039;_meta&#039;);

		/** This action is documented in wp-includes/meta.php */
		do_action( &quot;deleted_{$meta_type}_meta&quot;, (array) $meta_id, $object_id, $meta-&gt;meta_key, $meta-&gt;meta_value );

		// Old-style action.
		if ( &#039;post&#039; == $meta_type || &#039;comment&#039; == $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 $meta_ids Deleted metadata entry ID.
			 */
			do_action( &quot;deleted_{$meta_type}meta&quot;, $meta_id );
		}

		return $result;

	}

	// Meta id was not found.
	return false;
}

/**
 * Update the metadata cache for the specified objects.
 *
 * @since 2.9.0
 * @uses $wpdb WordPress database object for queries.
 *
 * @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) {
	if ( empty( $meta_type ) || empty( $object_ids ) )
		return false;

	if ( ! $table = _get_meta_table($meta_type) )
		return false;

	$column = sanitize_key($meta_type . &#039;_id&#039;);

	global $wpdb;

	if ( !is_array($object_ids) ) {
		$object_ids = preg_replace(&#039;|[^0-9,]|&#039;, &#039;&#039;, $object_ids);
		$object_ids = explode(&#039;,&#039;, $object_ids);
	}

	$object_ids = array_map(&#039;intval&#039;, $object_ids);

	$cache_key = $meta_type . &#039;_meta&#039;;
	$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( &#039;,&#039;, $ids );
	$id_column = &#039;user&#039; == $meta_type ? &#039;umeta_id&#039; : &#039;meta_id&#039;;
	$meta_list = $wpdb-&gt;get_results( &quot;SELECT $column, meta_key, meta_value FROM $table WHERE $column IN ($id_list) ORDER BY $id_column ASC&quot;, ARRAY_A );

	if ( !empty($meta_list) ) {
		foreach ( $meta_list as $metarow) {
			$mpid = intval($metarow[$column]);
			$mkey = $metarow[&#039;meta_key&#039;];
			$mval = $metarow[&#039;meta_value&#039;];

			// 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
 * @param string $primary_id_column
 * @param object $context (optional) The main query object
 * @return array( &#039;join&#039; =&gt; $join_sql, &#039;where&#039; =&gt; $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-&gt;get_sql( $type, $primary_table, $primary_id_column, $context );
}

/**
 * Container class for a multiple metadata query
 *
 * @since 3.2.0
 */
class WP_Meta_Query {
	/**
	* List of metadata queries. A single query is an associative array:
	* - &#039;key&#039; string The meta key
	* - &#039;value&#039; string|array The meta value
	* - &#039;compare&#039; (optional) string How to compare the key to the value.
	*              Possible values: &#039;=&#039;, &#039;!=&#039;, &#039;&gt;&#039;, &#039;&gt;=&#039;, &#039;&lt;&#039;, &#039;&lt;=&#039;, &#039;LIKE&#039;, &#039;NOT LIKE&#039;, &#039;IN&#039;, &#039;NOT IN&#039;,
	*              &#039;BETWEEN&#039;, &#039;NOT BETWEEN&#039;, &#039;REGEXP&#039;, &#039;NOT REGEXP&#039;, &#039;RLIKE&#039;.
	*              Default: &#039;=&#039;
	* - &#039;type&#039; string (optional) The type of the value.
	*              Possible values: &#039;NUMERIC&#039;, &#039;BINARY&#039;, &#039;CHAR&#039;, &#039;DATE&#039;, &#039;DATETIME&#039;, &#039;DECIMAL&#039;, &#039;SIGNED&#039;, &#039;TIME&#039;, &#039;UNSIGNED&#039;.
	*              Default: &#039;CHAR&#039;
	*
	* @since 3.2.0
	* @access public
	* @var array
	*/
	public $queries = array();

	/**
	 * The relation between the queries. Can be one of &#039;AND&#039; or &#039;OR&#039;.
	 *
	 * @since 3.2.0
	 * @access public
	 * @var string
	 */
	public $relation;

	/**
	 * Constructor
	 *
	 * @param array $meta_query (optional) A meta query
	 */
	function __construct( $meta_query = false ) {
		if ( !$meta_query )
			return;

		if ( isset( $meta_query[&#039;relation&#039;] ) &amp;&amp; strtoupper( $meta_query[&#039;relation&#039;] ) == &#039;OR&#039; ) {
			$this-&gt;relation = &#039;OR&#039;;
		} else {
			$this-&gt;relation = &#039;AND&#039;;
		}

		$this-&gt;queries = array();

		foreach ( $meta_query as $key =&gt; $query ) {
			if ( ! is_array( $query ) )
				continue;

			$this-&gt;queries[] = $query;
		}
	}

	/**
	 * Constructs a meta query based on &#039;meta_*&#039; query vars
	 *
	 * @since 3.2.0
	 * @access public
	 *
	 * @param array $qv The query variables
	 */
	function parse_query_vars( $qv ) {
		$meta_query = array();

		// Simple query needs to be first for orderby=meta_value to work correctly
		foreach ( array( &#039;key&#039;, &#039;compare&#039;, &#039;type&#039; ) as $key ) {
			if ( !empty( $qv[ &quot;meta_$key&quot; ] ) )
				$meta_query[0][ $key ] = $qv[ &quot;meta_$key&quot; ];
		}

		// WP_Query sets &#039;meta_value&#039; = &#039;&#039; by default
		if ( isset( $qv[ &#039;meta_value&#039; ] ) &amp;&amp; &#039;&#039; !== $qv[ &#039;meta_value&#039; ] &amp;&amp; ( ! is_array( $qv[ &#039;meta_value&#039; ] ) || $qv[ &#039;meta_value&#039; ] ) )
			$meta_query[0][&#039;value&#039;] = $qv[ &#039;meta_value&#039; ];

		if ( !empty( $qv[&#039;meta_query&#039;] ) &amp;&amp; is_array( $qv[&#039;meta_query&#039;] ) ) {
			$meta_query = array_merge( $meta_query, $qv[&#039;meta_query&#039;] );
		}

		$this-&gt;__construct( $meta_query );
	}

	/**
	 * Given a meta type, return the appropriate alias if applicable
	 *
	 * @since 3.7.0
	 *
	 * @param string $type MySQL type to cast meta_value
	 * @return string MySQL type
	 */
	function get_cast_for_type( $type = &#039;&#039; ) {
		if ( empty( $type ) )
			return &#039;CHAR&#039;;

		$meta_type = strtoupper( $type );

		if ( ! preg_match( &#039;/^(?:BINARY|CHAR|DATE|DATETIME|SIGNED|UNSIGNED|TIME|NUMERIC(?:\(\d+(?:,\s?\d+)?\))?|DECIMAL(?:\(\d+(?:,\s?\d+)?\))?)$/&#039;, $meta_type ) )
			return &#039;CHAR&#039;;

		if ( &#039;NUMERIC&#039; == $meta_type )
			$meta_type = &#039;SIGNED&#039;;

		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
	 * @param string $primary_table
	 * @param string $primary_id_column
	 * @param object $context (optional) The main query object
	 * @return array( &#039;join&#039; =&gt; $join_sql, &#039;where&#039; =&gt; $where_sql )
	 */
	function get_sql( $type, $primary_table, $primary_id_column, $context = null ) {
		global $wpdb;

		if ( ! $meta_table = _get_meta_table( $type ) )
			return false;

		$meta_id_column = sanitize_key( $type . &#039;_id&#039; );

		$join = array();
		$where = array();

		$key_only_queries = array();
		$queries = array();

		// Split out the queries with empty arrays as value
		foreach ( $this-&gt;queries as $k =&gt; $q ) {
			if ( isset( $q[&#039;value&#039;] ) &amp;&amp; is_array( $q[&#039;value&#039;] ) &amp;&amp; empty( $q[&#039;value&#039;] ) ) {
				$key_only_queries[$k] = $q;
				unset( $this-&gt;queries[$k] );
			}
		}

		// Split out the meta_key only queries (we can only do this for OR)
		if ( &#039;OR&#039; == $this-&gt;relation ) {
			foreach ( $this-&gt;queries as $k =&gt; $q ) {
				if ( ( empty( $q[&#039;compare&#039;] ) || &#039;NOT EXISTS&#039; != $q[&#039;compare&#039;] ) &amp;&amp; ! array_key_exists( &#039;value&#039;, $q ) &amp;&amp; ! empty( $q[&#039;key&#039;] ) )
					$key_only_queries[$k] = $q;
				else
					$queries[$k] = $q;
			}
		} else {
			$queries = $this-&gt;queries;
		}

		// Specify all the meta_key only queries in one go
		if ( $key_only_queries ) {
			$join[]  = &quot;INNER JOIN $meta_table ON $primary_table.$primary_id_column = $meta_table.$meta_id_column&quot;;

			foreach ( $key_only_queries as $key =&gt; $q )
				$where[&quot;key-only-$key&quot;] = $wpdb-&gt;prepare( &quot;$meta_table.meta_key = %s&quot;, trim( $q[&#039;key&#039;] ) );
		}

		foreach ( $queries as $k =&gt; $q ) {
			$meta_key = isset( $q[&#039;key&#039;] ) ? trim( $q[&#039;key&#039;] ) : &#039;&#039;;
			$meta_type = $this-&gt;get_cast_for_type( isset( $q[&#039;type&#039;] ) ? $q[&#039;type&#039;] : &#039;&#039; );

			if ( array_key_exists( &#039;value&#039;, $q ) &amp;&amp; is_null( $q[&#039;value&#039;] ) )
				$q[&#039;value&#039;] = &#039;&#039;;

			$meta_value = isset( $q[&#039;value&#039;] ) ? $q[&#039;value&#039;] : null;

			if ( isset( $q[&#039;compare&#039;] ) )
				$meta_compare = strtoupper( $q[&#039;compare&#039;] );
			else
				$meta_compare = is_array( $meta_value ) ? &#039;IN&#039; : &#039;=&#039;;

			if ( ! in_array( $meta_compare, array(
				&#039;=&#039;, &#039;!=&#039;, &#039;&gt;&#039;, &#039;&gt;=&#039;, &#039;&lt;&#039;, &#039;&lt;=&#039;,
				&#039;LIKE&#039;, &#039;NOT LIKE&#039;,
				&#039;IN&#039;, &#039;NOT IN&#039;,
				&#039;BETWEEN&#039;, &#039;NOT BETWEEN&#039;,
				&#039;NOT EXISTS&#039;,
				&#039;REGEXP&#039;, &#039;NOT REGEXP&#039;, &#039;RLIKE&#039;
			) ) )
				$meta_compare = &#039;=&#039;;

			$i = count( $join );
			$alias = $i ? &#039;mt&#039; . $i : $meta_table;

			if ( &#039;NOT EXISTS&#039; == $meta_compare ) {
				$join[$i]  = &quot;LEFT JOIN $meta_table&quot;;
				$join[$i] .= $i ? &quot; AS $alias&quot; : &#039;&#039;;
				$join[$i] .= &quot; ON ($primary_table.$primary_id_column = $alias.$meta_id_column AND $alias.meta_key = &#039;$meta_key&#039;)&quot;;

				$where[$k] = &#039; &#039; . $alias . &#039;.&#039; . $meta_id_column . &#039; IS NULL&#039;;

				continue;
			}

			$join[$i]  = &quot;INNER JOIN $meta_table&quot;;
			$join[$i] .= $i ? &quot; AS $alias&quot; : &#039;&#039;;
			$join[$i] .= &quot; ON ($primary_table.$primary_id_column = $alias.$meta_id_column)&quot;;

			$where[$k] = &#039;&#039;;
			if ( !empty( $meta_key ) )
				$where[$k] = $wpdb-&gt;prepare( &quot;$alias.meta_key = %s&quot;, $meta_key );

			if ( is_null( $meta_value ) ) {
				if ( empty( $where[$k] ) )
					unset( $join[$i] );
				continue;
			}

			if ( in_array( $meta_compare, array( &#039;IN&#039;, &#039;NOT IN&#039;, &#039;BETWEEN&#039;, &#039;NOT BETWEEN&#039; ) ) ) {
				if ( ! is_array( $meta_value ) )
					$meta_value = preg_split( &#039;/[,\s]+/&#039;, $meta_value );

				if ( empty( $meta_value ) ) {
					unset( $join[$i] );
					continue;
				}
			} else {
				$meta_value = trim( $meta_value );
			}

			if ( &#039;IN&#039; == substr( $meta_compare, -2) ) {
				$meta_compare_string = &#039;(&#039; . substr( str_repeat( &#039;,%s&#039;, count( $meta_value ) ), 1 ) . &#039;)&#039;;
			} elseif ( &#039;BETWEEN&#039; == substr( $meta_compare, -7) ) {
				$meta_value = array_slice( $meta_value, 0, 2 );
				$meta_compare_string = &#039;%s AND %s&#039;;
			} elseif ( &#039;LIKE&#039; == substr( $meta_compare, -4 ) ) {
				$meta_value = &#039;%&#039; . like_escape( $meta_value ) . &#039;%&#039;;
				$meta_compare_string = &#039;%s&#039;;
			} else {
				$meta_compare_string = &#039;%s&#039;;
			}

			if ( ! empty( $where[$k] ) )
				$where[$k] .= &#039; AND &#039;;

			$where[$k] = &#039; (&#039; . $where[$k] . $wpdb-&gt;prepare( &quot;CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$meta_compare_string})&quot;, $meta_value );
		}

		$where = array_filter( $where );

		if ( empty( $where ) )
			$where = &#039;&#039;;
		else
			$where = &#039; AND (&#039; . implode( &quot;\n{$this-&gt;relation} &quot;, $where ) . &#039; )&#039;;

		$join = implode( &quot;\n&quot;, $join );
		if ( ! empty( $join ) )
			$join = &#039; &#039; . $join;

		/**
		 * Filter the meta query&#039;s generated SQL.
		 *
		 * @since 3.1.0
		 *
		 * @param array $args {
		 *     An array of arguments.
		 *
		 *     @type array  $clauses           Array containing the query&#039;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( &#039;get_meta_sql&#039;, array( compact( &#039;join&#039;, &#039;where&#039; ), $this-&gt;queries, $type, $primary_table, $primary_id_column, $context ) );
	}
}

/**
 * Retrieve the name of the metadata table for the specified object type.
 *
 * @since 2.9.0
 * @uses $wpdb WordPress database object for queries.
 *
 * @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 . &#039;meta&#039;;

	if ( empty($wpdb-&gt;$table_name) )
		return false;

	return $wpdb-&gt;$table_name;
}

/**
 * Determine whether a meta key is protected.
 *
 * @since 3.1.3
 *
 * @param string $meta_key Meta key
 * @return bool True if the key is protected, false otherwise.
 */
function is_protected_meta( $meta_key, $meta_type = null ) {
	$protected = ( &#039;_&#039; == $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( &#039;is_protected_meta&#039;, $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 $meta_type  Meta type.
	 */
	return apply_filters( &quot;sanitize_{$meta_type}_meta_{$meta_key}&quot;, $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.
 * @param array $args Arguments
 */
function register_meta( $meta_type, $meta_key, $sanitize_callback, $auth_callback = null ) {
	if ( is_callable( $sanitize_callback ) )
		add_filter( &quot;sanitize_{$meta_type}_meta_{$meta_key}&quot;, $sanitize_callback, 10, 3 );

	if ( empty( $auth_callback ) ) {
		if ( is_protected_meta( $meta_key, $meta_type ) )
			$auth_callback = &#039;__return_false&#039;;
		else
			$auth_callback = &#039;__return_true&#039;;
	}

	if ( is_callable( $auth_callback ) )
		add_filter( &quot;auth_{$meta_type}_meta_{$meta_key}&quot;, $auth_callback, 10, 6 );
}
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