What should I do if nginx cannot open the php page?

With the rapid development of the Internet, Web services have become one of the important ways for people to obtain information. One of the most popular web service technologies is LAMP, namely Linux, Apache, MySQL and PHP. Their emergence makes it easier to build dynamic web applications. However, although LAMP is often used as a complete web service solution, due to the resource consumption and performance issues of the Apache server, more and more people choose to use Nginx instead of Apache as the web server.

Nginx is a high-performance lightweight web server and reverse proxy server. It is an open source software that is very stable and supports multiple platforms. It implements all the basic functions of Apache Web services and has better performance. However, many developers still encounter some legacy problems when using PHP with Nginx, such as Nginx not being able to open PHP pages correctly. Let's discuss in detail the problem that Nginx cannot open the PHP page and its solution.

Problem Description

When running certain PHP programs on the Nginx server, the PHP page cannot be opened. Browsers often display error messages: "502 Bad Gateway" or "404 Not Found." This is usually caused by PHP-FPM (PHP FastCGI Process Manager) failing to start correctly. PHP-FPM is an external process manager running in the Nginx solution and is responsible for managing the allocation and execution of the PHP interpreter process.

Solution

The following is a solution to the problem that Nginx cannot open the PHP page:

1. Check whether Nginx and PHP-FPM have been installed correctly

First make sure you have installed Nginx and PHP-FPM correctly. If you don't install them correctly, you may not be able to run PHP scripts correctly. To ensure that PHP-FPM has been installed correctly, run the following command in the terminal:

sudo apt-get install php-fpm

2. Check the Nginx configuration file

Make sure the Nginx configuration file correctly sets the location of the PHP interpreter, e.g. , you need to add the path of the PHP-FPM installation to "location/" in the Nginx configuration file.

server {
  listen   80;
  root /var/www/html;
  index index.php index.html index.htm;
  server_name test.com;
  
  location / {
    try_files $uri $uri/ /index.php?$query_string;
  }
  
  location ~ .php$ {
    fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include fastcgi_params;
    fastcgi_read_timeout 300;
  }
}

Paste the above code into the Nginx configuration file, making sure the path there matches your actual path. Once you have correctly configured the location of your PHP interpreter, Nginx will use it to render PHP scripts and deliver them to your website visitors' web browsers.

3. Restart the service

If you have changed the Nginx configuration file, you should restart the Nginx service. To restart Nginx, run the following command in the terminal:

sudo service nginx restart

Likewise, if you have changed the PHP-FPM configuration file, you must restart the PHP-FPM service. To restart PHP-FPM, run the following command in the terminal:`

sudo service php-fpm restart

4. Check if PHP-FPM has started

If your PHP page is still not working properly, it may be Because PHP-FPM is not started. To check if PHP-FPM is running, run the following command in the terminal:

systemctl status php-fpm.service

If it is running, you will see the words "Active: active (running)". If not, then you can restart PHP-FPM by running the following command:

sudo service php-fpm start

5. Check file and folder permissions

Finally, make sure that your PHP files and the files that PHP depends on The folders all have the correct permissions. If the permissions of the PHP file or dependent folders are not set correctly, the PHP script cannot be run. To change file or folder permissions, run the following command in the terminal:

sudo chown -R www-data:www-data /var/www/html/

The above command will change the ownership of the files and folders to the www-data user and group.

Summary

Nginx is a high-performance web server and reverse proxy server that can be used as an alternative to Apache to run dynamic web applications. However, due to some configurations and issues between Nginx and PHP-FPM, sometimes you may not be able to open the PHP page correctly. In this case, you can follow the above steps to troubleshoot one by one. After all the above steps are completed, you should be able to run PHP scripts on the Nginx server normally.

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