".$url."=0; $i--) { $position = 1; if($i = 0) { $str = 'a'.$str; } if ($str[$i] = strlen($possibilities)) { $str[$i] = $possibilities[$position]; if(strpos($possibilities, $str[$i-1])+1 <= strlen($possibilites)) { $str[$i-1] = $possibilities[strpos($possibilities, $str[$i-1])+1]; } } } } return $str; } /////////////////////////////////////////////////////////////////////////////// $str=$_GET['str']; $str=getnext($str); //sleep(3); echo ""; ?>