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run code in 200+ php & hhvm versions
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<?php class MyClass { /** * A test function * * First parameter must be an object of type OtherClass */ public function test(OtherClass $a) { echo $a->var; } /** * Another test function * * First parameter must be an array */ public function test_array(array $input_array) { print_r($input_array); } /** * First parameter must be iterator */ public function test_interface(Traversable $iterator) { echo get_class($iterator); } /** * First parameter must be callable */ public function test_callable(callable $callback, $data) { call_user_func($callback, $data); } } // Another example class class OtherClass { public $var = 'Hello World'; } $myclass = new MyClass; $otherclass = new OtherClass; $foo = new OtherClass; $myclass->test($foo); // Works: Prints the array $myclass->test_array(array('a', 'b', 'c')); // Works: Prints ArrayObject $myclass->test_interface(new ArrayObject(array())); // Works: Prints int(1) $myclass->test_callable('var_dump', 1); ?>