name : sync-post-metas.php <?php /** * A class to manage copy and synchronization of post metas * * @since 2.3 */ class PLL_Sync_Post_Metas extends PLL_Sync_Metas { public $options; /** * Constructor * * @since 2.3 * * @param object $polylang */ public function __construct( &$polylang ) { $this->meta_type = 'post'; parent::__construct( $polylang ); $this->options = &$polylang->options; add_filter( 'pll_translate_post_meta', array( $this, 'translate_thumbnail_id' ), 10, 3 ); } /** * Get the custom fields to copy or synchronize * * @since 2.3 * * @param int $from Id of the post from which we copy informations * @param int $to Id of the post to which we paste informations * @param string $lang Language slug * @param bool $sync True if it is synchronization, false if it is a copy * @return array List of meta keys */ protected function get_metas_to_copy( $from, $to, $lang, $sync = false ) { // Copy or synchronize post metas and allow plugins to do the same $metas = get_post_custom( $from ); $keys = array(); // Get public meta keys ( including from translated post in case we just deleted a custom field ) if ( ! $sync || in_array( 'post_meta', $this->options['sync'] ) ) { foreach ( $keys = array_unique( array_merge( array_keys( $metas ), array_keys( get_post_custom( $to ) ) ) ) as $k => $meta_key ) { if ( is_protected_meta( $meta_key ) ) { unset( $keys[ $k ] ); } } } // Add page template and featured image foreach ( array( '_wp_page_template', '_thumbnail_id' ) as $meta ) { if ( ! $sync || in_array( $meta, $this->options['sync'] ) ) { $keys[] = $meta; } } if ( $this->options['media_support'] ) { $keys[] = '_wp_attached_file'; $keys[] = '_wp_attachment_metadata'; $keys[] = '_wp_attachment_backup_sizes'; $keys[] = '_wp_attachment_is_custom_header'; // Random header image } /** This filter is documented in modules/sync/sync-metas.php */ return array_unique( apply_filters( 'pll_copy_post_metas', $keys, $sync, $from, $to, $lang ) ); } /** * Translates the thumbnail id * * @since 2.3 * * @param int $value Thumbnail id * @param string $key Meta key * @param string $lang Language code * @return int */ public function translate_thumbnail_id( $value, $key, $lang ) { return ( $this->options['media_support'] && '_thumbnail_id' === $key && $to_value = $this->model->post->get_translation( $value, $lang ) ) ? $to_value : $value; } }