$this keyword used for?

hi friends.. i want to know that why we use $this-> keyword in classes of php.. and how to use this ...and when we should use it..
thanks in advance

 

Inside the code of a class, you can use the this to refer to the object itself.

<?php
	class Foo
	{
		public $Bar;
		public function __construct()
		{
			$this->Bar = 0;
		}
		public function Baz()
		{
			$this->Bar = 10;
		}
	}
	$foo1 = new Foo();
	$foo2 = new Foo();
	$foo1->Baz();	// sets the value of $Bar inside $foo1 to 10
					// does not affect the $Bar inside $foo2
	var_dump($foo1, $foo2);
?>

PHP:

 

It's how you access properties and methods within the same class. The scope of "$this->" extends only within the class or its children.

 

Another example is:

class Foo{
public $Bar;
public Set_Bar($Bar){
$this->Bar = $Bar;
}
}