silverstripe-externallinks/src/Tasks/LinkChecker.php

<?php

namespace SilverStripe\ExternalLinks\Tasks;

/**
 * Provides an interface for checking that a link is valid
 */
interface LinkChecker
{
    
    /**
     * Determine the http status code for a given link
     *
     * @param string $href URL to check
     * @return int HTTP status code, or null if not checkable (not a link)
     */
    public function checkLink($href);
}