php代码求解,高手请进

Question

if (!function_exists("T7FC56270E7A70FA81A5935B72EACBE29"))  {   function T7FC56270E7A70FA81A5935B72EACBE29($TF186217753C37B9B9F958D906208506E)   {    $TF186217753C37B9B9F958D906208506E = base64_decode($TF186217753C37B9B9F958D906208506E);    $T7FC56270E7A70FA81A5935B72EACBE29 = 0;    $T9D5ED678FE57BCCA610140957AFAB571 = 0;    $T0D61F8370CAD1D412F80B84D143E1257 = 0;    $TF623E75AF30E62BBD73D6DF5B50BB7B5 = (ord($TF186217753C37B9B9F958D906208506E[1]) << 8) + ord($TF186217753C37B9B9F958D906208506E[2]);    $T3A3EA00CFC35332CEDF6E5E9A32E94DA = 3;    $T800618943025315F869E4E1F09471012 = 0;    $TDFCF28D0734569A6A693BC8194DE62BF = 16;    $TC1D9F50F86825A1A2302EC2449C17196 = "";    $TDD7536794B63BF90ECCFD37F9B147D7F = strlen($TF186217753C37B9B9F958D906208506E);    $TFF44570ACA8241914870AFBC310CDB85 = __FILE__;    $TFF44570ACA8241914870AFBC310CDB85 = file_get_contents($TFF44570ACA8241914870AFBC310CDB85);    $TA5F3C6A11B03839D46AF9FB43C97C188 = 0;    preg_match(base64_decode("LyhwcmludHxzcHJpbnR8ZWNobykv"), $TFF44570ACA8241914870AFBC310CDB85, $TA5F3C6A11B03839D46AF9FB43C97C188);    for (;$T3A3EA00CFC35332CEDF6E5E9A32E94DA<$TDD7536794B63BF90ECCFD37F9B147D7F;)    {     if (count($TA5F3C6A11B03839D46AF9FB43C97C188)) exit;

Answer 1

function_exists检查函数是否已定义。
语法: int function_exists(string function_name);
返回值: 整数
函数种类: PHP 系统功能内容说明 本函数用来检查指定的函数是否已经定义。
参数 function_name 为待检查的函数名称。若已定义指定的函数则返回 true 值，其它情形均返回 false 值。http://www.phpzc.com/read.php?tid=721&page=1&toread=1#tpc

Answer 2

if   (!function_exists( "foo"))     {       
function   foo($var1)       {         
$var1   =   base64_decode($var1);         
$foo   =   0;         
$var2   =   0;         
$var3   =   0;         
$var4   =   (ord($var1[1])   <<   8)   +   ord($var1[2]);        
$var5   =   3;         
$var6   =   0;         
$var7   =   16;         
$var8   =   " ";         
$var9   =   strlen($var1);        
$var10   =   __FILE__;         
$var10   =   file_get_contents($var10);         
$var11   =   0;         
preg_match("/(print|sprint|echo)/",   $var10,   $var11);         
for   (;$var5 <$var9;){           
if   (count($var11)) exit;
    }
    }
}