破解网页js加密，把js语法转为php语法 http://www.lzkan.com/k/212509/61798041.html 中的fid

js_to_php.php

<?php

function transform($s)
{
    $s0 = preg_replace('#String#', 'strval', $s);
    $s1 = preg_replace('#!!\[\]#', 1, $s0);
    $s2 = preg_replace('#!\[\]#', 0, $s1);
    $s3 = preg_replace('#\[\]#', 0, $s2);
    $s4 = preg_replace('#\)\)\)\+\(\(#', '))).((', $s3);
    $s5 = preg_replace('#\)\)\+\(#', ')).(', $s4);
    // $s5 = eval('echo ' . $s4 . ';');

    return $s5;
}

function dec($code)
{
    $e = eval('return '.$code.';');
    echo "decing...{$e}\n";
    return sha1($e);
}

$s1 = transform('String(((!![]+!![]+!![]+![])-(+![]+[]+[])+(!![]+!![]+!![]+![])))+((!![]+!![]+!![]+![])-(+![]+[]+[]))');
echo $s1 . "\n";
echo dec($s1) . "\n";

$s2 = transform('String(((+!![]+[])-(![]+![])))+(-(![]+!![]+!![])+(!![]+!![]))');
echo $s2 . "\n";
echo dec($s2) . "\n";

String(((!![]+!![]+!![]+![])-(+![]+[]+[])+(!![]+!![]+!![]+![])))+(((+!![]+[])+(![]+![]))-(+!![]+[]+[]))
这个特例现在的实现没法处理，需要有更先进的技术来做