metadata_exists

函数



      metadata_exists ( $meta_type, $object_id, $meta_key )

参数

(string)
$meta_type
Type of object metadata is for. Accepts ‘post’, ‘comment’, ‘term’, ‘user’, or any other object type with an associated meta table.
Required: 是
(int)
$object_id
ID of the object metadata is for.
Required: 是
(string)
$meta_key
Metadata key.
Required: 是

返回值

(bool) Whether a meta field with the given key exists.

定义位置

wp-includes/meta.php
, line 734

引入: 3.3.0

弃用: –

确定给定对象ID是否存在具有给定键的元字段。

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, $meta_type );
	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;
}

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