Hvorfor virker dette IP ikke?

Jeg bruger:

<?php
    $IP = (getenv(\"HTTP_X_FORWARDED_FOR\") != \"\") ? array_shift(explode(\",\",getenv(\"HTTP_X_FORWARDED_FOR\"))) : getenv(\"REMOTE_ADDR\");

    print $IP;
?>

... men det giver følgende fejl:

Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /mounted-storage/home21b/sub001/sc20616-DXDH/studiemedia.dk/merde/index.php on line 252

Parse error: syntax error, unexpected $end in /mounted-storage/home21b/sub001/sc20616-DXDH/studiemedia.dk/merde/index.php on line

Nogen løsninger? :)