What does undefined mean? Summary of ways to solve undefined index in php.

1. Modify

error_reporting = E_ALL

in the php.ini file to

error_reporting = E_ALL & ~E_NOTICE

2. Use the code

ini_set( 'error_reporting', E_ALL ^ ​​E_NOTICE );

ini_set ( 'display_errors', '0′ );

3. Use @ to suppress errors

@$name = $_GET['name'];

4. Make judgments

if( !empty($ _GET['name']) ) $name = $_GET['name'];

The above introduces what undefined means and a summary of PHP's methods to solve undefined index. , including the meaning of undefined, I hope it will be helpful to friends who are interested in PHP tutorials.