` and `::`) Work?
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Object Operators in PHP
In PHP, we utilize object operators to interact with objects and leverage their properties and methods. There are two primary object operators:
1. Object Operator (>)
This operator allows us to access instance properties and invoke methods within an object. Its syntax is as follows:
$object->property; $object->method();
For example, given the following class definition:
class Person {
private $name;
public function sayHello() {
return "Hello, my name is " . $this->name;
}
}
We can create an instance of this class and use the object operator to access its properties and invoke its methods:
$person = new Person(); $person->name = "John Doe"; echo $person->sayHello(); // Output: "Hello, my name is John Doe"
2. Static Object Operator (::)
This operator is used in three scenarios:
- Calling Static Methods: Static methods are defined using the static keyword and do not require an object instance. We can call them using the :: operator, followed by the method name.
class Math {
public static function add($a, $b) {
return $a + $b;
}
}
$result = Math::add(5, 10); // Output: 15
- Accessing Static Variables: Static variables belong to the class itself, not to individual instances. We can access them using the :: operator.
class Counter {
public static $count = 0;
public function increment() {
self::$count++;
}
}
Counter::increment(); // Increment the static $count
echo Counter::$count; // Output: 1
- Calling Parent's Methods: When using inheritance, we can call a method from a parent class within a child class using the :: operator.
class Animal {
public function move() {
//...
}
}
class Dog extends Animal {
public function bark() {
// Call the move() method from the parent class using ::
parent::move();
}
}The above is the detailed content of How Do PHP\'s Object Operators (`->` and `::`) Work?. For more information, please follow other related articles on the PHP Chinese website!
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