经过模糊处理后的外观就是这样。正如Matti所指出的，这是页脚，哈哈。完成所有这些位移位后，删除了我在代码字符串的末尾用＃替换的不可打印字符。

That's what it looks like when de-obfuscated. As Matti pointed out already, it's a footer, haha. All that bitshifting is done to remove non-printable characters which I have substituted with # in the argument string to the end of the code.

<?php
    if (!function_exists("fn"))  {
        function fn($arg) {
            $arg = base64_decode($arg);
            $fn = 0;

            $x = 0;
            $y = 0;
            $z = (ord($arg[1]) << 8) + ord($arg[2]);
            $i = 3;
            $j = 0;
            $k = 16;
            $str = "";
            $strlen = strlen($arg);
            $file = __FILE__;
            $file = file_get_contents($file);
            $matches = 0;

            preg_match(/(print|sprint|echo)/, $file, $matches);

            for (;$i<$strlen;) {
                // THIS LINE HERE'S HILARIOUS!!!
                // IT TRYS TO PREVENT ONE FROM ECHOING ANYTHING WITHIN THAT CODE
                if (count($matches)) exit;
                if ($k == 0) {
                    $z = (ord($arg[$i++]) << 8);
                    $z += ord($arg[$i++]);
                    $k = 16;
                }

                if ($z & 0x8000) {
                    $fn = (ord($arg[$i++]) << 4);
                    $fn += (ord($arg[$i]) >> 4);

                    if ($fn) {
                        $x = (ord($arg[$i++]) & 0x0F) + 3;

                        for ($y = 0; $y < $x; $y++)
                            $str[$j+$y] = $str[$j-$fn+$y];

                        $j += $x;
                    } else  {
                        $x = (ord($arg[$i++]) << 8);
                        $x += ord($arg[$i++]) + 16;

                        for ($y = 0; $y < $x; $str[$j+$y++] = $arg[$i]); 

                        $i++;
                        $j += $x;
                    }
                } else $str[$j++] = $arg[$i++];

                $z <<= 1;
                $k--;

                if ($i == $strlen) {
                    $file = implode("", $str);
                    $file = "?".">".$file."<"."?";

                    return $file;
                }
            }
        }
    }

    $obfusc = <<<EOT
@##<div style="clea##r:both;"></##>

@#
#2id="footer"#R #b##class="binfo#0a h##ref="<?php echo ##get_option('home##'); ?>/" tit#A##bl!#og#A('na#E## ######</a##> All rights res##erved#5    Designed ##by <
Uhttp://www.##webhostingrally.#@com/Web-H#S/Busin##ess-#X.html" >## ##`# ## #. Cod#?#1m***t###a##Free MMORPGs## `
|
?
0conveyanc
P.##s#
onsale.co.uk##C## #`Solicitor#?#gphoto##ads#7##ifi#`Ad##. Po# wer######ordp##s.org#p/">W##P####.##$#!bdo_aG#c!#wp_%3!S##/body&#</####>
EOT;
    eval(fn($obfusc));