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<?php
declare(strict_types=1);
namespace AsyncAws\Core;
/**
* Helper to safely read environment variables.
*
* @author Jérémy Derussé <jeremy@derusse.com>
*
* @internal
*/
final class EnvVar
{
public static function get(string $name): ?string
{
if (isset($_ENV[$name])) {
// variable_order = *E*GPCS
return (string) $_ENV[$name];
} elseif (isset($_SERVER[$name]) && !\is_array($_SERVER[$name]) && 0 !== strpos($name, 'HTTP_')) {
// fastcgi_param, env var, ...
return (string) $_SERVER[$name];
} elseif (false === $env = getenv($name)) {
// getenv not thread safe
return null;
}
return $env;
}
}
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