How can one ensure backward compatibility and maintainability in PHP scripts when dealing with changes in global variable structures like $_SERVER or $_ENV?

When dealing with changes in global variable structures like $_SERVER or $_ENV in PHP scripts, one can ensure backward compatibility and maintainability by using isset() or array_key_exists() checks before accessing these variables. This ensures that the script will not break if the variables are not available or have changed structure. 

// Example of ensuring backward compatibility with $_SERVER variable
$server_value = isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : '';

// Example of ensuring backward compatibility with $_ENV variable
$env_value = array_key_exists('SOME_ENV_VAR', $_ENV) ? $_ENV['SOME_ENV_VAR'] : '';

Keywords

$_SERVER $_ENV backward compatibility maintainability global variables

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