What is the output of the following code?

class Foo {
public $bar = 'bar';
public function __toString() { return $this-bar; }
public function __isset() { return true; }
}
$foo = new Foo();
echo isset($foo-bar);

Question

Which of the following statements are correct?

Accepted Answer

'__toString()' is a class method that determines how the object should behave if it is treated as a string.

Accepted Answer

'__isset()' is a class method called when the isset() or empty() functions are called on inaccessible properties. '

Answer

'__referTo()' is a class method that determines how the object should behave if it is used as a 'bridge' with another class.

Answer

'__set()' is a class method that defines how the object should behave if a method is not accessible.

Answer

'__call()' is a class method that defines how the object should behave if a static context method is inaccessible.

Question from the PHP5 test