This Keyword

Inside the class body this refers to the current class object.

It can be used to access / modify members and call functions inside the class.

Example

<?php class Rectangle { private $width; private $height; public function setWidth($widthVal) { // Modify object's member: $this->width = $widthVal; } public function setHeight($heightVal) { // Modify object's member: $this->height = $heightVal; } public function calcArea() { // Access class members: return $this->height * $this->width; } public function printData() { echo "Width = " . $this->width . "\n"; echo "Height = " . $this->height . "\n"; // Access class function: $area = $this->calcArea(); echo "Area = " . $area . "\n"; } } $rectangle = new Rectangle(); $rectangle->setWidth(3); $rectangle->setHeight(2); $rectangle->printData();

Output:

Width = 3 Height = 2 Area = 6

Explanation:

• At lines 9, 14 values are set to the members width and height.
• At lines 20, 25 and 26 members are accessed.
• At line 29 a class function is called.
• At line 34 an object is created.
• At lines 36 and 37 in which width and height are set, this points to the object created at line 34.