web2

web2

知识点

strrev()函数将字符串进行颠倒输出

ord()函数返回字符的ascii值

chr()函数返回ascii表中数字对应的字符

解题代码

<?php
$miwen="a1zLbgQsCESEIqRLwuQAyMwLyq2L5VwBxqGA3RQAyumZ0tmMvSGM2ZwB4tws";
function decode($str){
    $_='';
    $str=base64_decode(strrev(str_rot13($str)));
    for($_0=0;$_0<strlen($str);$_0++){
        $_c=substr($str,$_0,1);
        $__=ord($_c)-1;
        $_c=chr($__);
        $_=$_.$_c;
    }
    return $_;
}
var_dump(strrev(decode($miwen)));
?>