Online PHP editor | refs for Hm6kS

<?php class A { protected $c; protected $d; public function set(B $test) { static $testMap = []; if (empty($testMap)) { $testMap = [ C::class => 'setC', // only need to know which method to call D::class => 'setD', // ]; } if ($test === null) { return; } $testType = get_class($test); if (!array_key_exists($testType, $testMap)) { throw new InvalidArgumentException( sprintf( "Encountered unexpected body type (%s) that isn't supported", $testType ) ); } call_user_func([$this, $testMap[$testType]], $test); // uses $this to call the method on this object // alternatively, $this->{$testMap[$testType]}($test); } /** * @param C|null $c */ public function setC(C $c = null) { $this->c = $c; } /** * @param D|null $d */ public function setD(D $d = null) { $this->d = $d; } } abstract class B { protected $data; public function __construct($q = '') { $this->data = $q; } } class C extends B { } class D extends B {} $a1 = new A; $a1->set(new C("test c1")); var_dump($a1); $a2 = new A; $a2->set(new C("test c2")); var_dump($a2); $a3 = new A; $a3->set(new C("test c3")); var_dump($a3);