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How Do PHP\'s Arrow and Scope Resolution Operators Access Class Members and Methods?

Patricia Arquette
Patricia ArquetteOriginal
2024-12-03 16:43:11173browse

How Do PHP's Arrow and Scope Resolution Operators Access Class Members and Methods?

Exploring Object Operators in PHP

In PHP, object operators play a pivotal role in accessing class members and invoking methods. There are two primary object operators: the arrow operator (->) and the scope resolution operator (::).

1. Arrow Operator (->)

The arrow operator (->) is employed to interact with objects. It serves two main purposes:

  • Calling Instance Methods: Use the -> operator to invoke methods defined within the specified object. For instance:
$person->setName('John Doe');
  • Accessing Instance Properties: Retrieve or modify instance properties by employing the -> operator:
$person->age = 25;

2. Scope Resolution Operator (::)

The scope resolution operator (::) caters to various scenarios:

  • Calling Static Methods: Static methods can be invoked using ::. Static methods are defined using the static keyword and do not require object instantiation:
User::findByName('John');
  • Accessing Static Variables: Access static variables defined within a class via ::. Static variables exist independently of any object instances:
User::$defaultAge = 18;
  • Calling Parent Class Methods: Within a child class, use :: to call the parent's version of a method that has been overridden in the child class:
class Child extends Parent {
    public function someMethod() {
        parent::someMethod();
    }
}

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