if ( ! empty( $_FILES['muti_files'] ) ) {
$files = $_FILES['muti_files'];
foreach ($files['name'] as $key => $value){
if ($files['name'][$key]){
$file = array(
'name' => $files['name'][$key],
'type' => $files['type'][$key],
'tmp_name' => $files['tmp_name'][$key],
'error' => $files['error'][$key],
'size' => $files['size'][$key]
);
}
$_FILES = array("muti_files" => $file);
$i=1;
foreach ($_FILES as $file => $array) {
if ($_FILES[$file]['error'] !== UPLOAD_ERR_OK) __return_false();
require_once(ABSPATH . "wp-admin" . '/includes/image.php');
require_once(ABSPATH . "wp-admin" . '/includes/file.php');
require_once(ABSPATH . "wp-admin" . '/includes/media.php');
$attachment_id = media_handle_upload($file, $post_id);
$vv .= $attachment_id . ",";
$i++;
}
update_post_meta($post_id, '_product_image_gallery', $vv);
}
}