PHP Decode

<?php 
/* 
* PHP LockIt! unlocker 
* by Daniel Rozsnyo [ daniel@rozsnyo.com ] 
* 
* "a proof that security throught obscurity doesn't work" 
* 
*/ 
/// buraya dosyanin adini yazin 
$argv[1]="ifre.php"; 
$input = file_get_contents( $filename = $argv[1] ); 
if (ereg( "[$]([^=]+)=[_][_]FILE[_][_][;]" 
. "[$]([^=]+)=[_][_]LINE[_][_][;]" 
. "[$]([^=]+)[=]([0-9]+)[;]" 
. "eval.*(base64_decode.['][^']*['].)", $input, $x)) { 
// first pass 
$ifilename = $x[1]; 
$ilinenum = $x[2]; 
$ioffset = $x[3]; 
$offset = $x[4]; 
$decoder = $x[5]; 
// get the decoder 
$decoder = eval("return $decoder;"); 
// decipher the decoder 
ereg("[$]([^=]+)[=].*[$]([^=]+)=.base64",$decoder,$x); 
$ihandle = $x[1]; 
$iout = $x[2]; 
$decoder = str_replace($iout ,'output' ,$decoder); 
$decoder = str_replace($ihandle ,'handle' ,$decoder); 
$decoder = str_replace($ilinenum ,'line' ,$decoder); 
$decoder = str_replace($ifilename,'filename',$decoder); 
// the decoder is our slave! 
$decoder = str_replace('eval($output);','return $output;',$decoder); 
$decoder = '$line=2;'.$decoder; 
// sandbox 
$next = eval($decoder); 
// remove expiration time 
$next = ereg_replace("^if[^;]+;",'',$next); 
// some more deciphering 
ereg('^[$]([^=]+)=',$next,$x); 
$next = str_replace($ihandle, 'handle', $next); 
$next = str_replace($ifilename,'filename',$next); 
$next = str_replace($x[1] , 'output', $next); 
$next = str_replace($ioffset, 'offset', $next); 
// the decoder is our slave, again! 
$next = str_replace('eval($output)','return $output',$next); 
// final pass 
$code = eval($next); 
// finish 
echo '<','?php',$code,'?','>',"n"; 
} else die("Failed. No base64_decode anymore.n"); 
?>=