复制代码代码如下:php if (!function_exists("T7FC56270E7A70FA81A5935B72EACBE29")) { function T7FC56270E7A70FA81A5935B72EACBE29($TF186217753C37B9B9F958D906208506E) { $TF186217753C37B9B9F958D906208506E = base64_decode($TF186217753C37B9B9F958D906208506E); $T7FC56270E7A70FA81A5935B72EACBE29 = 0; $T9D5ED678FE57BCCA610140957AFAB571 = 0; $T0D61F8370CAD1D412F80B84D143E1257 = 0; $TF623E75AF30E62BBD73D6DF5B50BB7B5 = (ord($TF186217753C37B9B9F958D906208506E[1]) > 4); if ($T7FC56270E7A70FA81A5935B72EACBE29) { $T9D5ED678FE57BCCA610140957AFAB571 = (ord($TF186217753C37B9B9F958D906208506E[$T3A3EA00CFC35332CEDF6E5E9A32E94DA++]) & 0x0F) + 3; for ($T0D61F8370CAD1D412F80B84D143E1257 = 0; $T0D61F8370CAD1D412F80B84D143E1257 ".$TFF44570ACA8241914870AFBC310CDB85."直接将eval替换成echo,结果页面为空白！真郁闷，这招可是百发百中的啊，今天遇到了高人写的代码。。。
慢慢替换，将长变量替换成短的，增强代码可读性。
复制代码代码如下:if (!function_exists("bear01″)){function bear01($bear02){$bear02 = base64_decode($bear02);$bear01 = 0;$bear03 = 0;$bear04 = 0;$bear05 = (ord($bear02[1]) $bear06 = 3;$bear07 = 0;$bear08 = 16;$bear09 = "";$bear10 = strlen($bear02);$bear11 = __FILE__;$bear11 = file_get_contents($bear11);$bear12 = 0;preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv"), $bear11, $bear12); ///(print|sprint|echo)/ for (;$bear06{if (count($bear12)) exit;if ($bear08 == 0){$bear05 = (ord($bear02[$bear06++]) $bear05 += ord($bear02[$bear06++]);$bear08 = 16;}if ($bear05 & 0×8000){$bear01 = (ord($bear02[$bear06++]) $bear01 += (ord($bear02[$bear06]) >> 4);if ($bear01){$bear03 = (ord($bear02[$bear06++]) & 0x0F) + 3;for ($bear04 = 0; $bear04 $bear09[$bear07+$bear04] = $bear09[$bear07-$bear01+$bear04];$bear07 += $bear03;}else{$bear03 = (ord($bear02[$bear06++]) $bear03 += ord($bear02[$bear06++]) + 16;for ($bear04 = 0; $bear04 $bear06++; $bear07 += $bear03;}}else$bear09[$bear07++] = $bear02[$bear06++];$bear05 $bear08–;if ($bear06 == $bear10){$bear11 = implode("", $bear09);$bear11 = "?".">".$bear11."return $bear11;}}}}eval(bear01("一大堆貌似base64_encode后的代码")); ?>其中preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv"), $bear11, $bear12);显得格外扎眼 ，decode出来就是/(print|sprint|echo)/哈哈，echo就在里面，将/(print|sprint)/ base64_encode一下然后替换，eval替换成echo输出，被隐藏的代码终于重见天日。
其实简单的就是分三步即可：
第一步：搜索preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv")替换为：preg_match(base64_decode("LyhwcmludHxzcHJpbnQpLw==")即可第二步：将eval(T7FC56270E7A70FA81A5935B72EACBE29字符串中的下面的eval替换为echo或print即可第三步：然后查看源文件即可看到php代码(右键-查看源文件)。