Can You Understand This Code !!

<?php
// Set execution time : 5 mins
set_time_limit(300);
error_reporting(0);
// Should be same as defined in java constant file.
// should be between 1-50
$encKey =20;
/*
$myFile = "log.txt";
$fh = fopen($myFile, 'w') or die("can't open file");
fclose($fh);
$myFile = "log.txt";
$fh = fopen($myFile, 'a') or die("can't open file");
*/

$line = file_get_contents("php://input");
$encryptEnable = substr($line,0,1);
$line =  substr($line,1);


//fwrite($fh, ":INPUTTTTTTT:".$line.":INPUTTTTTTTTTTT:"); 

if($encryptEnable=="Y"){
$line = deccrypt_string($line);   }


$hostport = substr($line,0,61);
$bodyData = substr($line,61);
$line ='';

$host = substr($hostport,0,50);
$port = substr($hostport,50,10);
$issecure = substr($hostport,60,1);
//fwrite($fh, $host); fwrite($fh, $port);  fwrite($fh, $issecure); 

if($issecure=="Y"){
$host = "ssl://".$host;
}

$fsok = fsockopen(trim($host) , intval(trim($port))); 
if(FALSE == $fsok ) {echo "Target Host not Found/Down"; return ;}
fwrite($fsok, $bodyData ); 
$port ='';$host ='';$hostport= '';$bodyData='';

while ($line = fread($fsok, 25000))
{
if($encryptEnable=="Y")
echo encrypt_string($line);
else
echo $line;
}

fclose($fsok); 
//fclose($fh); 


///////////////////////////////////////////////////////////////////////////////////////

// Sample encrypt.Keeping the ouput size same.
function encrypt_string($input)   
{
global $encKey;   
$line="";
for($i=0;$i<strlen($input);$i++){
$line .= chr(ord($input[$i])+$encKey); 
}
    return $line;   
}   
  
// Sample decrypt.Keeping the ouput size same.
function deccrypt_string($input)   
{   
global $encKey; 
$line="";
for($i=0;$i<strlen($input);$i++){
$line .= chr(ord($input[$i])-$encKey); 
}
    return $line;   
}   

?>

PHP:

Pls If you understand what is happening in this code I really need your help cos am new in PHP..

 

This script:
- gets string from the input stream
- decrypts it if necessary
- parses the host, port and data from this string
- connects to the host: port and sends the data
- receives the answer
- crypts it if necessary
- sends it back

 

@Badhim, thanks its what it does, actually a kind of proxy...my problem is that i would like to be able to display an additional info for everyone that uses the script, would like the info to appear at the bottom of the pages...pls can u help me with where to add the code n how to do it...