How do I dynamically invoke a class method in PHP?

Question

How can I dynamically invoke a class method in PHP? The class method is not static. It appears that

call_user_func(...)

only works with st

Answer 1

Class Foo{
 public function show(){
  echo 'I am in Foo Class show method';
 }

}

call_user_func(array('Foo', 'show'));

$classname = new Foo;
call_user_func(array($classname, 'show'));
call_user_func($classname .'::show'); // As of 5.2.3

$foo = new Foo();    
call_user_func(array($foo, 'show'));