PHP Server Environment FAQ Guide: Quickly Solve Common Problems

Common solutions for PHP server environments include ensuring that the correct PHP version is installed and that relevant files have been copied to the module directory. Disable SELinux temporarily or permanently. Check and configure PHP.ini to ensure that necessary extensions have been added and set up correctly. Start or restart the PHP-FPM service. Check your DNS settings for resolution issues.

PHP Server Environment FAQ Guide: Quickly Solve Common Problems

1. Initialize the Apache Module

PHP modules usually need to be initialized through Apache's LoadModule directive. Common errors include:

Syntax error on line 23 of /etc/apache2/conf-available/php7.4.conf:
Cannot load /usr/lib/apache2/modules/libphp7.4.so into server: /usr/lib/apache2/modules/libphp7.4.so: cannot open shared object file: No such file or directory

Solution:

Make sure you have the correct PHP version installed and have copied libphp7.4.so Go to the modules directory.

2. Disabling SELinux

The SELinux (Security Enhanced Linux) security module may prevent PHP processes from running. Common errors include:

httpd: SELinux is preventing httpd from getattr access on the file ...

Solution:

Temporarily disable SELinux:

setenforce 0

Permanently disable SELinux:

sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

3. Configure PHP.ini

PHP.ini is the PHP configuration file that contains various settings, including error log location and memory limits. Common errors include:

PHP startup: Unable to load dynamic library '/usr/lib64/php/modules/pdo_mysql.so'

Solution:

Make sure you have installed the necessary PHP extensions and added the correct extension lines to PHP.ini .

4. Check the PHP-FPM pool

PHP-FPM (FastCGI Process Manager) is used to manage PHP processes. Common errors include:

pool php-fpm is running, but no process manager running

Solution:

Start or restart the PHP-FPM service.

5. Fix DNS resolution issues

PHP applications rely on DNS resolution to connect to databases and external services. Common errors include:

Fatal error: Uncaught PDOException: SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket ...

Solution:

Check your DNS settings and make sure the hostname can be resolved.

Practical case:

Suppose you encounter the following error when installing WordPress:

Database connection error. Unable to connect to the database: connect() failed for ... unrecognized SSL method ''.

This may be due to PHP not loading the necessary MySQL extension Caused. Fix this issue by adding the following line to PHP.ini:

extension=pdo_mysql

After restarting the Apache or PHP-FPM service, WordPress should run normally.

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