Check your Composer dependencies at runtime.
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Composition Build Status

Composition provides a lightweight and generic API, that you can use to check your environment at runtime, instead of manually go checking for regex in constants, classes/functions existence, matching a version against a class constant, ...

It only works when using Composer as package management tool.

Some examples

A single command to check your PHP environment :

if (!\Composition::has('vendor/super-package', '>=2.0') {
    $this->markTestSkipped('The following tests require "SuperPackage" to be at least at 2.0');

\Composition::has('php', '5.4.*');

Check the platform :

if (\Composition::isWindows()) {
// ...


This tool should mostly be used in your unit tests, and not be abused in production.