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Editing: sync-post-metas.php

<?php
/**
 * @package Polylang
 */

/**
 * A class to manage copy and synchronization of post metas
 *
 * @since 2.3
 */
class PLL_Sync_Post_Metas extends PLL_Sync_Metas {
	/**
	 * Stores the plugin options.
	 *
	 * @var array
	 */
	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 string[] List of meta keys.
	 */
	protected function get_metas_to_copy( $from, $to, $lang, $sync = false ) {
		$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'] ) ) {
			$from_keys = (array) get_post_custom_keys( $from );
			$to_keys   = (array) get_post_custom_keys( $to );

$keys = array_unique( array_merge( $from_keys, $to_keys ) );
			foreach ( $keys 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;
	}
}

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