How does $this-> differ from self:: in PHP object-oriented programming?

$this-> refers to an instance variable or method within an object, while self:: refers to a static variable or method within a class. When using $this->, you are accessing the specific instance of the object's property or method, while self:: accesses the class itself. It's important to use $this-> when working with instance-specific data and self:: when working with class-wide data. 

class Example {
    public $instanceVariable = 'Instance variable';

    public static $staticVariable = 'Static variable';

    public function getInstanceVariable() {
        return $this->instanceVariable;
    }

    public static function getStaticVariable() {
        return self::$staticVariable;
    }
}

$example = new Example();

echo $example->getInstanceVariable(); // Output: Instance variable
echo Example::getStaticVariable(); // Output: Static variable

Keywords

$this-> self:: PHP object-oriented programming difference

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