wp_ajax_set_attachment_thumbnail()

Source

function wp_ajax_set_attachment_thumbnail() {	if ( empty( $_POST['urls'] ) || ! is_array( $_POST['urls'] ) ) {	wp_send_json_error();	}	$thumbnail_id = (int) $_POST['thumbnail_id'];	if ( empty( $thumbnail_id ) ) {	wp_send_json_error();	}	if ( false === check_ajax_referer( 'set-attachment-thumbnail', '_ajax_nonce', false ) ) {	wp_send_json_error();	}	$post_ids = array();	// For each URL, try to find its corresponding post ID.	foreach ( $_POST['urls'] as $url ) {	$post_id = attachment_url_to_postid( $url );	if ( ! empty( $post_id ) ) {	$post_ids[] = $post_id;	}	}	if ( empty( $post_ids ) ) {	wp_send_json_error();	}	$success = 0;	// For each found attachment, set its thumbnail.	foreach ( $post_ids as $post_id ) {	if ( ! current_user_can( 'edit_post', $post_id ) ) {	continue;	}	if ( set_post_thumbnail( $post_id, $thumbnail_id ) ) {	++$success;	}	}	if ( 0 === $success ) {	wp_send_json_error();	} else {	wp_send_json_success();	}	wp_send_json_error(); } 

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