gistfile1.txt

#!/usr/bin/php

<?php

interface foo { }

class object { }

class baseUser extends object { }

class myUser extends baseUser implements foo { }

$user = new myUser();

print("class_implements value: " . json_encode(class_implements('myUser')) . "\n");
print("is_instance_of value: " . is_subclass_of($user,'baseUser') . "\n");
print("is_instance_of value: " . is_subclass_of($user,'object') . "\n");

// Output:
// class_implements value: {"foo":"foo"}
// is_instance_of value: 1
// is_instance_of value: 1