PHP Notice: Undefined index:... Solution to the Problem

 

First, this is not an error, it is warning. Therefore, if the server cannot be changed, each variable should be defined before use.

 

Method 1: Modify server configurations

Modify the php. ini configuration file, error_reporting = E_ALL &~ E_NOTICE

 

Method 2: Initialize the variables and write them in a standardized manner (complicated because there are a large number of variables ). However, we have not found a proper definition method.

 

Method 3: Add error_reporting (0) to the header of each file. If not, open php. ini, find display_errors, and set display_errors to Off. No errors will be prompted in the future. Ini_set ("display_errors", 0 );

Method 4: Perform judgment: isset ($ _ GET ["page"]) if-else judgment

Or you can add '@' to indicate that this line is not aborted if an error occurs or a warning is reported.

For example: @ $ page = $ _ GET ["page"]

 

Method 5: The file1.php file pays a value for the $ xx variable and transmits it to file2.php using post,

If file2.php does not have the definition of $ xx and $ yy = $ xx is used directly, the system reports the error "undifined variaable $ xx ", if the file2.php file is defined with $ xx = "";, the $ xx value of file1.php cannot be passed!

 

In file2.php

If (! Isset ($ xx) $ xx = "";