What is the difference between using $this-> and self:: in PHP classes and functions?

When working within a PHP class, $this-> refers to an instance of the class itself, while self:: refers to the class itself. $this-> is used to access instance variables and methods, while self:: is used to access static variables and methods. It's important to use the correct syntax depending on whether you are working with instance or static members of the class. 

class MyClass {
    public $instanceVar = 'Instance Variable';

    public static $staticVar = 'Static Variable';

    public function instanceMethod() {
        echo $this->instanceVar; // Accessing instance variable using $this->
    }

    public static function staticMethod() {
        echo self::$staticVar; // Accessing static variable using self::
    }
}

$obj = new MyClass();
$obj->instanceMethod(); // Output: Instance Variable

MyClass::staticMethod(); // Output: Static Variable

Keywords

$this self PHP classes functions scope resolution operator

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