differences in class name references

classe_references

<?php

class Foo {
	function echo_classes() {
		echo __CLASS__;
		echo get_class();
		echo get_class($this);
		echo get_called_class();
	}
}

class Bar extends Foo{}

$bar = new Bar();
$bar->echo_classes();

/** OUTPUT **/
// Foo
// Foo
// Bar
// Bar