Analyze and solve the problem of PHP code not taking effect

PHP is a programming language widely used in the field of web development, and php-fpm is the process manager of PHP, responsible for managing the process of PHP code execution on the server. When using php-fpm, many developers may encounter the problem that PHP code does not take effect. In this article, we'll discuss some common causes and provide some solutions.

1. Check whether the php-fpm service is running

The first thing to check is whether the php-fpm service is running. You can check whether php-fpm is running by running the following command:

systemctl status php-fpm

If the php-fpm service is not started, you need to start the service:

systemctl start php-fpm

2. Check whether the PHP configuration file is correct

If the php-fpm service is running, but your PHP code still does not take effect, it may be because the PHP configuration file (php.ini) is not configured correctly. The location of the php.ini file can be found with the following command:

php --ini

This command will return the path where php.ini is located. Please open the php.ini file with a text editor and look for the following:

cgi.fix_pathinfo=0

This means enable PATH_INFO and set it to 0, please change it to:

cgi.fix_pathinfo=1

Then save Change and restart the php-fpm service:

systemctl restart php-fpm

3. Check the Nginx or Apache configuration file

If the php-fpm service is running and there is no problem with the php configuration file, then the problem It may appear in Nginx or Apache configuration files. In this case, you need to check the following:

For Nginx:

Please open the Nginx configuration file (usually located at /etc/nginx/conf.d/ or /etc/nginx/ sites-enabled/ directory), find a section similar to the following:

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;
}

Make sure fastcgi_pass points to the correct IP address and port number. If you changed the php-fpm listening port in the php-fpm.conf file, you need to use the changed port number. Make sure the SCRIPT_FILENAME variable is set correctly.

For Apache:

Please open Apache’s configuration file (usually located at /etc/httpd/conf/httpd.conf or /etc/httpd/conf/httpd-vhosts.conf), and Find the following:

<filesmatch>
    SetHandler application/x-httpd-php
</filesmatch>

Likewise, make sure SetHandler points to the correct IP address and port number, and that SCRIPT_FILENAME is set correctly.

4. Check if PHP extensions are loaded correctly

If you are using certain extensions in your PHP code, make sure they are loaded correctly. Loaded PHP extensions can be checked with the following command:

php -m

If your extension does not appear in the list, you need to install the extension. Extensions can be installed by running the following command in the terminal:

sudo apt-get install php-extension-name

Please replace "extension-name" with the name of the extension you need to install.

5. Clear cache

In some cases, the problem of PHP code not taking effect may be caused by cache. You can try clearing your cache to resolve this issue. For Nginx and Apache, you can use the following command to clear the cache:

sudo service nginx/apache2 restart

For php-fpm, you can use the following command to restart php-fpm and clear the cache:

sudo systemctl restart php-fpm

Summary

When using php-fpm, the problem of PHP code not taking effect may be caused by multiple reasons. This article provides some solutions, including checking whether the php-fpm service is running, checking whether the PHP configuration file is correct, checking the Nginx or Apache configuration file, checking whether the PHP extension is loaded correctly, and clearing the cache, etc. If you still can't resolve the issue, please refer to the documentation or ask for help in the developer community.

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