php does not display warning method

A warning warning appears when running the program, and I want to block it

How to turn off the warning prompt in php:

Method one: (Recommended learning: PHP video tutorial)

Modify the following properties in the php.ini file

display_errors = Off
error_reporting = E_ALL

Method two:

Write at the beginning of the php file:

<?php
      error_reporting(0);
?>

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