What are the best practices for ensuring smooth transition and compatibility when upgrading PHP versions in a server environment?

When upgrading PHP versions in a server environment, it is important to follow best practices to ensure a smooth transition and compatibility with existing code. This includes testing the new PHP version in a development environment, checking for deprecated features or changes in behavior, updating any deprecated functions or syntax, and ensuring all dependencies are compatible with the new PHP version. 

// Example code snippet for checking PHP version compatibility
if (version_compare(PHP_VERSION, '7.4', '<')) {
    die('This application requires PHP 7.4 or higher. Please upgrade your PHP version.');
}

Keywords

backward compatibility deprecated functions PHP migration tools PHP version check error reporting levels

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