Online PHP editor | refs for 1ErUr

<?php function addSchema($url, $shemaToAdd = 'http') { $allowedShemas = array('http', 'https'); if(!in_array($shemaToAdd, $allowedShemas)) { throw new Exception('Shema is not allowed: ' .$shemaToAdd); } foreach($allowedShemas as $shema) { $shema.= '://'; if(substr($url, 0, strlen($shema)) === $shema) { $url = substr($url, 0, strlen($shema)); break; } } return $shemaToAdd . '://' . $url; } $url = ' http://exkavator.ru/trade/parts/message/7113.html'; echo addSchema($url);