raplace text/url with dots after 20 letters [....]

i have a piece of code that collects url from a database then i con call this in another file but i would like to replace the text after 20 letters the several dots here is the code

		
//print_r($row);
$info['results'][$num]['number']=$num+1;
$info['results'][$num]['url']=$row[0];
$info['results'][$num]['title']=$row[1];
$info['results'][$num]['type']=$row[2];
if($row[3]) $info['results'][$num]['filesize']=", FileSize: ".$row[3]; //number_format($row[3],0,"."," ");
		else $info['results'][$num]['filesize']="<font color=\"grey\"> Not Checked</font>";
		if($row[5])
		{
			if(strpos($row[5],"http://")!==false) $info['results'][$num]['source']=" <a href=\"".$row[5]."\" target=\"_blank\"><img src=\"templates/padlock.gif\"style=\"border-style: none\" alt=\"Source\" width=\"64\" height=\"16\" /></a>";
			else $info['results'][$num]['source']=" (<a href=\"http://".$row[5]."\" target=\"_blank\">source</a>)";
		}
		else 				$info['results'][$num]['source']=""; <-- think its this line
		$info['results'][$num]['relevance']=$row[4];

		$substr=strtolower(substr($info['results'][$num]['url'],-20));
		foreach($icons as $key => $value)

PHP:

 

change this
$substr=strtolower(substr($info['results'][$num]['url'],-20));
to
$substr=strtolower(substr($info['results'][$num]['url'],20));

 

naope it not doing anything

 

For sanities sakes, I'll just use placeholders...

// our string
$string = $myarray['location1'];
// start at position 0 and continue until position 20
$string = substr($string, 0, 20);
// lower everything
$string = strtolower($string);

// all in one - harder to debug
$string = strtolower(substr($string, 0, 20))."...";

Code (markup):

 

that aint workin aswell i cant clock on myself

 

What is it doing, not doing, etc? Errors, samples?

 

<style type="text/css">
.mydiv
{
	height: 20px;
	width: 150px;
	overflow:hidden;
        text-overflow: ellipse;
}
</style>

<div class="mydiv">This is long text. This is long text. This is long text. This is long text.</div>

Code (markup):

 

<?php

echo substr($string,0,20)."...";
?>

PHP:

didnt realize everyone else said to use substr