ReflectionMethod 类

Note that the public member $class contains the name of the class in which the method has been defined:
<?php
class A {public function __construct() {}}
class B extends A {}
$method = new ReflectionMethod('B', '__construct');
echo $method->class; // prints 'A'
?>

We can make a "Automatic dependenci injector" in classes when her constructors depends other classes (with type hint).
<?php
class Dependence1 {
 function foo() {
 echo "foo";
 }
}
class Dependence2 {
 function foo2() {
 echo "foo2";
 }
}
final class myClass
{
 private $dep1;
 private $dep2;
 public function __construct(
 Dependence1 $dependence1, 
 Dependence2 $dependence2
 )
 {
 $this->dep1 = $dependence1;
 $this->dep2 = $dependence2; 
 }
 
}
// Automatic dependence injection (CLASSES)
$constructor = new ReflectionMethod(myClass::class, '__construct');
$parameters = $constructor->getParameters();
$dependences = [];
foreach ($parameters as $parameter) {
 $dependenceClass = (string) $parameter->getType();
 $dependences[] = new $dependenceClass();
}
$instance = new myClass(...$dependences);
var_dump($instance);
?>

Results in: 
object(myClass)#6 (2) {
 ["dep1":"myClass":private]=>
 object(Dependence1)#4 (0) {
 }
 ["dep2":"myClass":private]=>
 object(Dependence2)#5 (0) {
 }
}