Micro Shield PHP scripting encryption expert PHP decryption algorithm

Copy CodeThe code is as follows:
<?php
/***********************************
* Granville Shield PHP encryption expert decryption algorithm BY:NEEAO
*http://neeao.com
*2009-09-10
***********************************/

$filename = "play-js.php";//Files to decrypt
$lines = file ($filename);//0,1,2 Line

The first time Base64 decryption
$content = "";
if (Preg_match ("/o0o0000o0\" ('. * ')/", $lines [1], $y))
{
$content =str_replace ("O0o0000o0", "", $y [0]);
$content =str_replace ("')", "", $content);
$content =base64_decode ($content);
}
Find the key in the first Base64 decrypted content
$decode _key= "";
if (Preg_match ("/\"), '. * ',/', $content, $k))
{
$decode _key=str_replace ("), '", "", $k [0]);
$decode _key=str_replace ("',", "", $decode _key);
}
Find the length of the string to intercept
$str _length= "";
if (Preg_match ("/,\d*\),/", $content, $k))
{
$str _length=str_replace ("),", "", $k [0]);
$str _length=str_replace (",", "", $str _length);
}
Encrypted ciphertext after intercepting the file
$Secret =substr ($lines [2], $str _length);
Echo $Secret;

Direct Restore ciphertext output
echo "<?php\n". Base64_decode (Strtr ($Secret, $decode _key, ' abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/')). "? > ";
?>