Search Engine Friendly String converter.

SEF_Converter.php

<?php

function generate_seo_link($string, $replace = '-'){
	$string = strtolower($string);

	//remove query string
	if(preg_match("#^http(s)?://[a-z0-9-_.]+\.[a-z]{2,4}#i",$string)){
		$parsed_url = parse_url($string);
		$string = $parsed_url['host'].' '.$parsed_url['path'];
	}

	//replace / and . with white space
	$string = preg_replace("/[\/\.]/", " ", $string);

	$string = preg_replace("/[^a-z0-9_\s-]/", "", $string);

	//remove multiple dashes or whitespaces
	$string = preg_replace("/[\s-]+/", " ", $string);

	//convert whitespaces and underscore to $replace
	$string = preg_replace("/[\s_]/", $replace, $string);

	//limit the slug size
	$string = substr($string, 0, 100);

	//seo link is generated
	return $string;
}    

?>