Signature generator and IPB profile page

Trying to get a more dynamic signature generator built for a forum based off of IPB, here is some of the code:

Code:

<?php
function GetUserInfo($ProfileURL){
        $pagecontent = file_get_contents($ProfileURL);
        $start = strpos($pagecontent, "class='pp-name'")+17;
        $end = strpos($pagecontent, "</font> | <a",$start);
        $pagecontent = substr($pagecontent, $start, $end-$start);
        $start = strpos($pagecontent, "<h3")+27;
        $pagecontent = substr($pagecontent, $start, strlen($pagecontent));
        $pagecontent = str_replace("<font color=\"green\">TR: ","",$pagecontent);
        $pagecontent = str_replace(" (","|",$pagecontent);
        $iArray = explode("|",$pagecontent);
        return $iArray;
    }
  			$pronumber = $_POST["pronumber"];

				//$userinfo = GetUserInfo("http://www.anything4free.com/forums/index.php?showuser=16501");

        $userinfo = GetUserInfo("http://www.anything4free.com/forums/index.php?showuser='$pronumber'");
        echo $userinfo[0] . "<br>";
        echo $userinfo[1];
        
?>

PHP:

new to php, the

//$userinfo = GetUserInfo("http://www.anything4free.com/forums/index.php?showuser=16501");

PHP:

line works,

but

$userinfo = GetUserInfo("http://www.anything4free.com/forums/index.php?showuser='$pronumber'");

PHP:

returns plaintext html garbage, instead of stripping the page down and returning

timelf123
6

Code (markup):

What is wrong with my syntax?

Tim