How to enable php error reporting in nginx

Nginx is a widely used web server and reverse proxy server used in many high-traffic websites and applications. However, when using Nginx, sometimes you will encounter PHP errors. This article will introduce the reasons for turning on PHP error and how to solve this problem.

1. The existence of the problem

In Nginx, using the PHP interpreter requires binding PHP-CGI to Nginx. The interaction between PHP-CGI and Nginx can be achieved using the FastCGI protocol. As configured normally, Nginx writes the output of PHP-CGI to a temporary file and then transfers the file through the file system. Errors are logged in Nginx's error log and sent to the front-end user.

Since Nginx does not have a built-in PHP module, if PHP-CGI is not configured correctly, PHP errors may not be displayed properly.

2. Reasons for error reporting

When PHP reports an error, Nginx will display the HTTP status code of 502 Bad Gateway by default. This may be due to the following reasons:

1. The PHP-CGI process cannot communicate with Nginx. This may be caused by PHP-CGI not being running, or Nginx being configured incorrectly.
2. PHP-CGI process returned an error. This may be caused by incorrect PHP-CGI configuration or a program error.
3. Nginx failed to write all response headers to the client. This may be caused by misconfiguration of Nginx or a busy server.

3. Solution

In order to correctly solve the PHP error problem, you must find the cause and find the correct solution.

1. Confirm whether the PHP-CGI process is running

To check whether the PHP-CGI process is running, you can use the following command:

ps aux | grep php

If not Any output means PHP-CGI is not running. If you need to restart PHP-CGI, you can use the following command:

/etc/init.d/php-fpm restart

2. Check whether the PHP-CGI process communicates with Nginx

To ensure that the PHP-CGI process communicates with Nginx For correct communication, you need to check the following configuration in the Nginx configuration file:

location ~ \.php$ {
  fastcgi_pass   127.0.0.1:9000;
  fastcgi_index  index.php;
  include        fastcgi_params;
  fastcgi_param  SCRIPT_FILENAME $document_root$fastcgi_script_name;
}

Herefastcgi_pass specifies the address and port of the PHP-CGI process. If it is incorrect or not started, it will As a result, Nginx cannot communicate with the PHP-CGI process.

3. Check PHP-CGI configuration

To check whether the PHP-CGI configuration is correct, you can open the PHP configuration file, such as /etc/php5/cgi/php .ini, and make sure the following settings are correct:

display_errors = On
error_reporting = E_ALL & ~E_NOTICE

These settings will enable PHP's error display and error reporting capabilities.

4. Check Nginx configuration

To ensure that the Nginx configuration file is correct, you need to open the Nginx configuration file, such as /etc/nginx/nginx.conf , and make sure the following settings are correct:

error_log /var/log/nginx/error.log;

This setting will enable Nginx's error logging function, helping to find and debug errors.

Conclusion

When using Nginx, PHP error reporting is a common problem, but it is also easy to solve. Just check that the PHP-CGI process is running and communicating correctly with Nginx, and that PHP and Nginx are configured correctly. With these simple steps, you can easily resolve PHP error issues and ensure your server is running properly.

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