Symfony polyfill backporting some PHP 7.3+ features to lower PHP versions
翻译 - 该组件提供PHP 7.3之前的版本中不可用的功能。
Docker image based on Ubuntu 18.04 with PHP-7.3/Composer/MySQL-5.7/Yarn to test Symfony projects.
Hyperf Chat
Image Docker compose PHP 7.3-apache-stretch with redis 5.0.2
A trivial but working polyfill for PHP 7.3 is_countable function. Supports PHP versions >= 5.3