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This component provides some PHP 7.1 features to applications using earlier PHP versions.
$ composer require symfony/polyfill-php71
Alternatively, you can clone the https://github.com/symfony/polyfill-php71 repository.
If you install this component outside of a Symfony application, you must
vendor/autoload.php file in your code to enable the class
autoloading mechanism provided by Composer. Read
this article for more details.