Solutions to Undefined index and Undefined variable appearing in php

This prompt always appears during the PHP project. At first, $act was used to accept the data posted from the form: $act=$_POST['act'];

This prompt always appears during the PHP project. At first, $act was used to accept the data posted from the form: $act=$_POST['act'];

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

In addition, sometimes: Notice: Undefined variable: Submit...and other such prompts.

Cause: Caused by undefined variables

Solution: 1) error_reporting settings: Find error_reporting = E_ALL Modify to error_reporting = E_ALL & ~E_NOTICE

2) register_globals settings: Find register_globals = Off Modify 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 we do if this happens? Just find php.ini in C:WINDOWS In php.ini, line 302 error_reporting = E_ALL changed to error_reporting = E_ALL & ~E_NOTICE and then restart apache2.2. Solution: modify php.ini Change: error_reporting = E_ALL Modify to: error_reporting = E_ALL & ~E_NOTICE If you don’t want any errors to be displayed, modify them directly: display_errors = Off If you do not have permission to modify php.ini, you can add it in the php header ini_set("error_reporting","E_ALL & ~E_NOTICE"); That’s it