seo-friendly.php

<?php 

function seoFriendly($string, $separator) {

  //Only accept dashes or underscores
  if( $separator == "-" || $separator == "_" )  {
    $separator = $separator;
  } else {
    $separator = "-";
  }
  
  //Lower case everything
  $string = strtolower($string);
  //Make alphanumeric (removes all other characters)
  $string = preg_replace("/[^a-z0-9_\s-]/", "", $string);
  //Clean up multiple dashes or whitespaces
  $string = preg_replace("/[\s-]+/", " ", $string);
  //Convert whitespaces and underscore to dash
  $string = preg_replace("/[\s_]/", "-", $string);
  return $string;
}



?>