What are common issues when installing PHP versions like 4.3.9 and how can they be resolved?

Issue: Common issues when installing PHP version 4.3.9 may include compatibility problems with newer versions of web servers or operating systems. To resolve this, you can try running the PHP installation in compatibility mode or updating your web server to a version that supports PHP 4.3.9. Code snippet:

// Check PHP version compatibility
if (version_compare(phpversion(), '4.3.9', '<')) {
    die('PHP version 4.3.9 or higher is required for this script.');
}