interface iTest
{
}
class baz implements iTest
{
}
class bar
{
}
class foo extends bar
{
public function testFoo(self $obj)
{
var_dump($obj);
}
public function testBar(parent $obj)
{
var_dump($obj);
}
public function testBaz(iTest $obj)
{
var_dump($obj);
}
}
$foo = new foo();
$foo->testFoo(new foo());
$foo->testBar(new bar());
$foo->testBaz(new baz());
$foo->testFoo(new stdClass());
// Catchable fatal error