​x
 
<!DOCTYPE html>
<html>
<body>
​
<?php
class MyClass {}
class AnotherClass extends MyClass{}
$obj = new AnotherClass();
​
if($obj instanceof AnotherClass) {
  echo "该对象是 AnotherClass";
}
​
// 该对象也是其派生类的实例
if($obj instanceof MyClass) {
  echo "该对象是 MyClass<br>";
}
?>
​
</body>
</html>