php plugin

[Ghostt]

how to include this php code to vbulletin ? i think wirh plugin and Global start but inst working like that. this script should only be at the showthread.php


function: if the user is logged in.
That special link is disepearing from all post.

PHP Code:

<if condition="$bbuserinfo['userid']">

function callback($buffer)
{

  return (str_replace("http://example.com", "", $buffer));
}

ob_start("callback");
<else />
</if>