The Symfony Polyfill / PHP 7.3 Component

This component provides some PHP 7.3 features to applications using earlierPHP versions.

Installation

$ composer require symfony/polyfill-php73

Note

If you install this component outside of a Symfony application, you mustrequire the vendor/autoload.php file in your code to enable the classautoloading mechanism provided by Composer. Readthis article for more details.

Usage

Once this component is installed in your application, you can use the followingfunctions, no matter if your PHP version is earlier than PHP 7.3.

Provided Functions

• is_countable
• hrtime
• array_key_first
• array_key_last