Solutions to php Undefined index and Undefined variable_PHP tutorial

$act=$_POST['act'];

Using the above code always prompts
Notice: Undefined index: act in F:windsflybookpost.php on line 18

In addition, sometimes There will also be

reference content
Notice: Undefined variable: Submit...

and other such prompts

Cause: caused by the variable being undefined

Solution:
1) error_reporting setting:
Find error_reporting = E_ALL
Change to error_reporting = E_ALL & ~E_NOTICE

2) register_globals setting:
Find register_globals = Off
and change it to register_globals = On

Notice: Undefined variable: email in D:PHP5ENOTEADDNOTE.PHP on line 9
　Notice: Undefined variable: subject in D:PHP5ENOTEADDNOTE.PHP on line 9
　Notice: Undefined variable: comment in D:PHP5ENOTEADDNOTE.PHP on line 9
　...
　Originally, PHP does not need to define variables, but what should you do if this happens? What?
Just find the
of php.ini in C:WINDOWS. In php.ini, line 302 error_reporting = E_ALL
and change it to
error_reporting = E_ALL & ~E_NOTICE and then restart apache2.2.
Solution: Modify php.ini
Change: error_reporting = E_ALL
to: error_reporting = E_ALL & ~E_NOTICE
If you don’t want any errors to be displayed, directly modify:
display_errors = Off
If you do not have permission to modify php.ini, you can add
ini_set("error_reporting", "E_ALL & ~E_NOTICE");
to the php header.

http://www.bkjia.com/PHPjc/318782.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/318782.htmlTechArticle$act=$_POST['act']; Using the above code always prompts Notice:Undefinedindex:actinF:windsflybookpost .phponline18 In addition, sometimes the reference content Notice:Undefinedvariable:Submit....