pi.auto_link.php

/**
 * Add http:// to links if there isn't one
 */
public function auto_link() {
	$url = $this->EE->TMPL->fetch_param('url', NULL);

	if ($url) {
		$http = stripos($url, 'http://');
		$https = stripos($url, 'https://');

		if ($http === FALSE && $https === FALSE) {
			$url = 'http://' . $url;
		}
	}

	return $url;
}