Fehlermeldung Cannot modify header information...

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<php
phpinfo();
?>

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if(version_compare($phpversion, "4.1.0") == -1){
     $_REQUEST    =  array_merge($HTTP_COOKIE_VARS, $HTTP_POST_VARS, $HTTP_GET_VARS);
     $_COOKIE    =& $HTTP_COOKIE_VARS;
     $_SERVER    =& $HTTP_SERVER_VARS;
     $_FILES        =& $HTTP_POST_FILES;
     $_GET        =& $HTTP_GET_VARS;
     $_POST        =& $HTTP_POST_VARS;
}

// GD-Version
ob_start();
phpinfo(8);
$phpinfo    = ob_get_contents();
              ob_end_clean();
$phpinfo    = strip_tags($phpinfo);
$phpinfo    = stristr($phpinfo,"gd version");
$end        = strpos($phpinfo,"Free");
$phpinfo1    = substr($phpinfo,0,$end);
$phpinfo1    = str_replace("GD Version","",$phpinfo1);