网上看，比如一个URL www.xx.com/news.php?id=3 这样一个链接，在后面加上一个 ' 符号就报错了，或者是 and 1=1 然后 and 1=2 如果两个返回值不一样就可以判断有注入点，
那比如 www.xx.com/news.php?id=3 这个地方，我的sql是这样的 select * from news where id='3' 在地址栏加一个 ' 符号以后为什么会出错了，and 1=1 和and 1=2 为什么就可以判断有注入点呢，
回复讨论(解决方案)
加上'就报错，不知道提示什么错误，如果加上'，传值就当做字符处理，但是如果你开启agic_quotes_gpc为on
引号就被转义，至于and 1 = 1，比如有
SELECT * FROM tbl_users
WHERE username='zhang3' OR 1=1 #' AND password = 'abc123' LIMIT 0,1
由于 # 是 mysql中的注释符, #之后的语句不被执行，实现上这行语句就成了：
SELECT * FROM tbl_users
WHERE username='zhang3' OR 1=1
这样攻击者就可以绕过认证了
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