Automatic posts duplication across languages (polylang pro)

duplicate-auto.php

<?php
/**
 * Cette action permet lors d'une sauvegarde d'article, de le dupliquer automatiquement dans toutes les langues 
 */
add_action( 'pll_save_post', 'w_force_duplicate_post', 10, 3 );
function w_force_duplicate_post( $post_id, $post, $translations ) {
	remove_filter( 'pll_save_post', 'w_force_duplicate_post' );
	if ( 'event' != get_post_type( $post ) ) {
		return false;
	}
	$langs = pll_languages_list();
	$polylang = PLL();
	$sync_model = new \PLL_Sync_Post_Model( $polylang );
	foreach ( $langs as $l ) {
		if ( empty( $translations[ $l ] ) ) {
			$sync_model->copy_post( $post_id, $l, true );
		}
	}
	add_filter( 'pll_save_post', 'w_force_duplicate_post', 10, 3 );
}

/**
 * Et ça c'est juste un crochet pour appliquer la duplication à tous les contenus qui existaient déjà
 */
add_action( 'admin_post_force_duplicate_events', 'w_go_duplicate' );
function w_go_duplicate() {
	$events = get_posts( array(
		'post_type' => 'event',
		'posts_per_page' => -1,
		'suppress_filters' => true,
	) );
	foreach ( $events as $ev ) {
		do_action( 'save_post', $ev->ID, $ev, true );
	}
}