How to close the notice in php

Some ways to turn off notice errors in PHP, but what I have to say is that when turning off error prompts, will a large number of notice-level errors in the program code cause PHP performance to decrease

Method 1. Modify php.ini and change error_reporting to E_ALL & ~E_NOTICE (Recommended learning: PHP video tutorial)

Method 2: Write at the beginning of the PHP page where the notice needs to be closed: error_reporting(E_ALL & ~E_NOTICE);

See if you have any defined variables that you can use directly. However, when programming PHP, it is not as strict as C. This feature is often used when programming. The default setting of PHP is to display these prompts, which will cause the page to not be displayed properly.

//error_reporting(E_ALL);error_reporting(E_ALL || ~E_NOTICE); 
//显示除去 E_NOTICE 之外的所有错误信息

The first means to display all errors, and the second means to display all errors without displaying warnings. We only need to add // in front of the second line and remove // ​​in front of the first line.

Attachment: Detailed explanation of each error report

error_reporting(0);//禁用错误报告
error_reporting(E_ALL ^ E_NOTICE);//显示除去 E_NOTICE 之外的所有错误信息
error_reporting(E_ALL^E_WARNING^E_NOTICE);//显示除去E_WARNING E_NOTICE 之外的所有错误信息
error_reporting(E_ERROR | E_WARNING | E_PARSE);//显示运行时错误，与error_reporting(E_ALL ^ E_NOTICE);效果相同。
error_reporting(E_ALL);//显示所有错误

The examples are as follows:

if (!$a) {
 error_reporting(0);
 ob_start('ob_gzhandler');
} else {
 error_reporting(E_ALL ^ E_NOTICE);

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