PHP Dependency Injection in <10 lines

inject.php

<?php

function inject (array $container, $class, $method) {
	extract($container);
	$args = array_map(
		function (ReflectionParameter $arg) {
			return $arg->getName();
		},
		(new ReflectionMethod($class, $method))->getParameters()
	);
	return compact($args);
}

class A {
	public static function foo(B $b) {}
	public static function bar(C $c, B $b) {}
}

class B {}
class C {}

$container = [
	'b' => new B(),
	'c' => new C()
];

call_user_func_array(['A', 'foo'], inject($container, 'A', 'foo'));
// calls A::foo($b);

call_user_func_array(['A', 'bar'], inject($container, 'A', 'bar'));
// calls A::bar($c, $b);