Can someone help to solve a error with my index.php=Blank Page?

Can someone help to solve a error with my index.php=Blank Page?

pI'm trying to do a Random Redirect Urls for a work./p precodelt;?php
$urlist=file(http://www.votrecaf.borna... ); $nl=count($urlist);
$np=rand(0, 4); $url=($urlist[$np]); header(Location: $url); // a
mysterious error appears exit; ?gt; /code/pre