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metadata_exists › WordPress Function
Since3.3.0
已弃用n/a
› metadata_exists ( $meta_type, $object_id, $meta_key )
参数: (3) |
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返回: |
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定义在: |
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Determines if a meta field with the given key exists for the given object ID.
源码
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; }