Eval encoded file decoder

[Tungesh]

I am making a project in PHP where i am facing some issues with purchase script where i am using a very simple eval based encoding system i have try to think a lot and finally i have came to know how to decode the file by hand and following are the code for the same.

PHP Code:

<?php
// Open and read the content of the encoded file into a variable
$file = file_get_contents('encoded_file1.php');

// Strip php tags
$file = str_replace('<?php', "", $file);
$file = str_replace('<?', "", $file);   // Make sure to get rid of short tags....
$file = str_replace('?>', "", $file);

// Strip new lines
$file = str_replace("\n", "", $file);

// Add semi colon to get around a parsing issue.
$file = $file.';';

// Change the Eval function
$file = str_replace('eval', 'echo ', $file);

// Function to eval the new string
function demo()
{
  global $file;
  ob_start();
  eval($file);
  $contents = ob_get_contents();
  ob_end_clean(); 
  return($contents);
}  

// Run the code thru once
$file = demol(); 

// Counter
$cnt = 1;

// Loop it till it's decoded
while(preg_match('/^\?><\?php eval/', $file))
{
  $file = str_replace('?><?php eval', 'echo', $file);
  $file = str_replace('?><?', "", $file);
  $file = deval();
  ++$cnt;
}

//clean up some tags
$file = str_replace('?><?php', "", $file);
$file = str_replace('?><?', "", $file);

echo $cnt,' iterations<br/><br/>';
echo '<pre>';
echo $file;
echo '</pre>';
?>

[opaper]

After thinking a lot and taking many people and resources from different sites and book i have created code for ByteRun's encoding and at the same time i had a check it's really working very fine so there is no need of having any tension about the code if anyone finds more such kinds of code then please reply to this thread

PHP Code:

// Function to eval the new string 
function test() 
{ 
  global $file1, $_F, $_X; 
   
  ob_start(); 
  eval($file1); 
  $contents = ob_get_contents(); 
  ob_end_clean(); 
  return($contents); 
} 

// Run the code 
$file1 = test(); 

$_X = base64_decode($_X); 

$file1 = str_replace('$_X=base64_decode($_X);', "", $file1); 


preg_match('/\$_X=strtr.*?\'\);/', $file1, $match2); 

$file1 = str_replace($match2[0], "", $file1); 

eval($match2[0]); 

$_R=ereg_replace('__FILE__',"'".$_F."'",$_X); 

$_R = ltrim($_R, '?><?php'); 
$_R = rtrim($_R, '?>'); 

echo $_R; 
?>