PHP Object Learning - Basic Concept - $this

php_OOP_dollar_this.php

<?php 

class A {
	function foo(){
		if (isset($this)){
			echo "\$this is defined (";
			echo get_class($this);
			echo ")\n";
		} else {
			echo "\$this is not defined";
		}

	}
}

class B {
	function bar(){
		// Note: the next line will issue a warning if E_STRICT is enabled.
		A::foo();
	}
}


function case1(){
	echo "new A():<br>";
	$objectA = new A();
	$objectA->foo();
}

function case2(){
	// Note: the next line will issue a warning if E_STRICT is enabled.
	echo "<br>A::foo():";
	A::foo();
}

function case3(){
	$b = new B();
	echo "<br>\$b->bar()";
	$b->bar();
}

function case4(){
	// Note: the next line will issue a warning if E_STRICT is enabled.
	echo "B::bar();<br>";
	B::bar();
}


case1();

?>