If the pdo_mysql extension is missing for PHP 8.1 in your Alt-PHP environment, you'll need to install it manually. Here's a step-by-step guide:

1. Check Available Extensions:

   • Verify if pdo_mysql is available for PHP 8.1 in your Alt-PHP repository. Sometimes, certain repositories or environments might not have all extensions readily available.

2. Enable Repositories (If Necessary):

   • Make sure you have the appropriate repositories enabled in your package manager. This might involve adding additional repositories that provide the pdo_mysql extension.

3. Install pdo_mysql Extension:

• sudo yum install alt-php81-pdo_mysql

  If you're using a different package manager (e.g., apt for Debian-based systems), you would use the appropriate command for that package manager.

• Restart PHP and Web Server:

• sudo service alt-php81-fpm restart

  Make sure to replace alt-php81-fpm with the actual PHP-FPM service name for PHP 8.1 in your Alt-PHP environment.

• Verify Installation:

  Create a PHP file (e.g., phpinfo.php) with the following content:

  php
• <?php phpinfo(); ?>

  Upload this file to your server and access it through a web browser. Look for the pdo_mysql section to confirm that it's now enabled.

• Update php.ini (Optional):

  • Depending on your setup, you might need to add or uncomment the following line in your php.ini file:

    makefile