Symfony Polyfill / Php73========================This component provides functions added to PHP 7.3 core:-[`array_key_first`](https://php.net/array_key_first)-[`array_key_last`](https://php.net/array_key_last)-[`hrtime`](https://php.net/function.hrtime)-[`is_countable`](https://php.net/is_countable)-[`JsonException`](https://php.net/JsonException)More information can be found in the[main Polyfill README](https://github.com/symfony/polyfill/blob/main/README.md).License=======This library is released under the [MIT license](LICENSE).
