php Undefined index和Undefined variable的解决方法

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php Undefined index和Undefined variable的解决方法_php技巧

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May 17, 2016 am 09:37 AM

indexundefinedvariable

$act=$_POST['act'];

用以上代码总是提示
Notice: Undefined index: act in F:\windsflybook\post.php on line 18

另外，有时还会出现

引用内容
Notice: Undefined variable: Submit ......

等一些这样的提示

原因：由于变量未定义引起的

解决方法：
1) error_reporting设置：
找到error_reporting = E_ALL
修改为error_reporting = E_ALL & ~E_NOTICE

2) register_globals设置：
找到register_globals = Off
修改为register_globals = On

Notice: Undefined variable: email in D:\PHP5\ENOTE\ADDNOTE.PHP on line 9
　　Notice: Undefined variable: subject in D:\PHP5\ENOTE\ADDNOTE.PHP on line 9
　　Notice: Undefined variable: comment in D:\PHP5\ENOTE\ADDNOTE.PHP on line 9
　　........
　　本来php是不需要定义变量的，但是出现这种情况应该怎么办呢?
　　只要在C:\WINDOWS找出php.ini的
　　在php.ini中的302行 error_reporting = E_ALL
　　修改成
　　error_reporting = E_ALL & ~E_NOTICE再重启apache2.2就行了
　　解决方法：修改php.ini
　　将： error_reporting = E_ALL
　　修改为：error_reporting = E_ALL & ~E_NOTICE
　　如果什么错误都不想让显示，直接修改：
　　display_errors = Off
　　如果你没有php.ini的修改权限,可在php头部加入
　　ini_set("error_reporting","E_ALL & ~E_NOTICE");
　　即可

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