The steps to install and configure Apache and PHP are as follows: 1. Install Apache and PHP and related modules through the package manager; 2. Create a test file to verify whether PHP is operating normally; 3. Check and enable the mod_php module, and adjust the MIME type configuration if necessary; 4. Modify the settings in php.ini (such as upload size, memory limit, etc.) according to requirements and restart the service; 5. Pay attention to file permissions, extensions and virtual host configuration. After completing the above steps, Apache can parse and execute PHP files normally.

Apache and PHP are classic combinations, and many websites use them to build dynamic content. If you are new to server configuration, you may find it a bit complicated, but in fact, it is not difficult to solve it by following the steps.

Install Apache and PHP

The first step is to install Apache and PHP. In most Linux distributions, you can complete the installation through the package manager. For example, on Ubuntu, you can use the following command:

• Update the package list: sudo apt update
• Install Apache: sudo apt install apache2
• Install PHP and commonly used extensions: sudo apt install php libapache2-mod-php

After the installation is complete, Apache will automatically load the PHP module. You can create a simple PHP file (for example /var/www/html/info.php ), write <?php phpinfo(); ?> , and then visit this file to see if the PHP information page is displayed.

Configure Apache to support PHP

By default, Apache can run PHP after installation, but sometimes you may need to make some adjustments.

Check whether Apache has loaded the mod_php module. You can use the command apachectl -M | grep php to view it. If you don't see output like php_module , it may be that the module is not enabled.

If it is a Debian/Ubuntu system, you can try to enable the module:

• Enable PHP module: sudo a2enmod php8.x (version number varies according to your installation situation)
• Restart Apache: sudo systemctl restart apache2

Also, make sure that the .php file can be parsed correctly in the root directory of your website. If a download prompt appears instead of execution of accessing the .php file, it means that the MIME type or processor is not configured correctly.

Modify PHP settings (optional)

The main configuration file of PHP is usually /etc/php/版本號/apache2/php.ini . You can modify some common settings here, such as:

• upload_max_filesize : Controls the maximum size of uploaded files
• post_max_size : The maximum capacity of POST requests is usually a little larger than the upload limit
• memory_limit : The maximum memory allowed by the script
• display_errors : It can be turned on during development, but it is recommended to close the production environment.

After the modification, don't forget to restart Apache to make the configuration take effect: sudo systemctl restart apache2

Other precautions

• Permissions issue : Make sure your PHP files are placed in a directory where Apache has permission to read, usually /var/www/html/ or your customized virtual host directory.
• File extension recognition : If you write .php5 or other extension, Apache will not be executed as PHP by default, so it is best to use .php in a unified manner.
• Virtual Host Configuration : If you use a virtual host, remember to confirm that PHP processing is enabled in the corresponding <virtualhost></virtualhost> configuration.

Basically that's it. Configuring Apache to run PHP is not too complicated, but some details are easy to ignore, especially module loading and file permissions. When encountering problems, you can look at Apache's error log (usually in /var/log/apache2/error.log ) to find clues.

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