What are the best practices for updating PHP versions while ensuring existing scripts function correctly?

When updating PHP versions, it is crucial to ensure that existing scripts are compatible with the new version to prevent any potential issues or errors. To do this, it is recommended to thoroughly test the scripts on a development environment with the updated PHP version before deploying them to production. Additionally, checking for deprecated functions or features in the new PHP version and updating the scripts accordingly will help ensure smooth transition. 

// Example of checking for deprecated functions in PHP 7.4
if (version_compare(PHP_VERSION, '7.4', '>=')) {
    if (function_exists('deprecated_function')) {
        // Update the script to use a non-deprecated function
        new_function();
    }
}

Keywords

backward compatibility PHP migration deprecated functions error handling testing

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