Extend the export of WordPress for media

wordpress-extend-export-for-media.php

<?php

define( 'DOING_AJAX', true );
define( 'WP_ADMIN', true );
define( 'WP_IMPORTING', true );

$err = array();

/** Load WordPress Bootstrap */
require_once 'wp-load.php';
require_once 'wp-admin/includes/image.php';

$args = array(
	'post_type' => get_post_types(),
	'posts_per_page' => -1,
	'post_status'    => 'any',
	'meta_query'     => array(
		'relation' => 'AND',
		array(
			'key'     => '_thumbnail_id',
			'compare' => 'EXISTS',
		),
	),
);

$query = new \WP_Query( $args );

if($query ->have_posts()) :

    while($query->have_posts()) : $query->the_post();

	    set_time_limit( 120 );

	    $post_id = get_the_ID();

	    $thumbnailId = get_post_meta( $post_id, '_thumbnail_id', true );

	    $wpAttachedFile = get_post_meta($thumbnailId, '_wp_attached_file', 1 );

	    if (!empty($wpAttachedFile)) {
		    update_post_meta($post_id , '_thumbnail_file', $wpAttachedFile );
	    }

	    printf(
		    __( 'Importing %s ... %s' ) . PHP_EOL,
		    get_the_title(),
		    $wpAttachedFile
	    );

    endwhile;

endif;