Interface / type query in PHP


In PHP language, we can judge whether a variable belongs to an instance of a specified class or interface through the type operator instanceof

interface I {
     public  function hello();

class A implements  I {
     public function hello()
         // TODO: Implement hello() method.
          print ("Hello from A\n");

class B extends  A {
     public function  greeter (){
         print("Hello from B\n");
$a=new A;
$b=new B;
var_dump($b  instanceof B);
var_dump($b instanceof A);
var_dump($b instanceof I);

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