How to display errors in php

How does php display errors?

How to debug PHP and make the browser prompt errors

1. Change the value of display_errors in

php.ini to On;

or

Add

ini_set("display_errors", "On");
error_reporting(E_ALL);
ini_set("display_errors", "On");  
error_reporting(E_ALL); //显示所有错误信息

to the top of the php code page. This only displays the error message in php. For js, you can use Firefox's firebug to check it

2. Turn on the php debugging mode under Ubuntu and display the error message

The default setting of php under Ubuntu is not to display error messages. If an error occurs in the program, an "error message that cannot handle this request" will be displayed. This is very inconvenient in a development environment.

In fact, we only need to edit the apache configuration file

1. My apache configuration file directory is /etc/apache2/apache2.conf

sudo vim /etc /apache2/apache2.conf

Add the following two lines at the end

　　php_flag display_errors        on
　　php_value error_reporting       2039

2. Restart apache

sudo service apache2 restart

This will complete the display of the error message.

Note: If it still doesn’t work, change the configuration under php.ini (I can display it without changing it, because the code added above is already enabled)

sudo vim /etc/php/7.0/cli/php.ini

Search for display_errors The default is display_errors=Off Change to display_errors=On Save and exit and restart apache2

3. The opening steps are as follows:

1. Open the php.ini file.

Take ubuntu as an example. This file is in the /etc/php5/apache2 directory.

2. Search and modify the following line, change the Off value to On

display_errors = Off

3. Search for the following line

error_reporting = E_ALL & ~E_NOTICE

or search:

error_reporting = E_ALL & ~E_DEPRECATED

and change it to

error_reporting = E_ALL | E_STRICT

4. Modify Apache's httpd.conf,

Take Ubuntu as an example. This file is in the /etc/apache2/ directory. This is a blank file.

Add the following two lines:

php_flag display_errors on
php_value error_reporting 2039

5. Restart Apache and it will be OK.

Restart command: ：sudo /etc/init.d/apache2 restart.

4. web.config.debug = True

Recommended: "PHP Tutorial 》

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