<?php           
function makeMyUrlFriendly($url){
    $output = preg_replace("/\s+/" , "_" , trim($url));
    $output = preg_replace("/\W+/" , "" , $output);
    $output = preg_replace("/_/" , "-" , $output);
    return strtolower($output);
}
?>

http://www.apphp.com/index.php?snippet=php-seo-friendly-links

This code removes all special characters from the given URL and make it SEO friendly.

SEO friendly links in PHP

php, links

PHP