PHP Static Properties: Access Class Properties Without Objects

Belongs to the class itself, not any object instance.
Is shared across all instances of the class.
Static properties are declared with the static keyword:
Can be accessed using the ClassName::$propertyName or self::$propertyName from within the class.

Syntax

<?php
  class ClassName {
    public static $staticProp = "W3Schools";
  }
?>

To access a static property use the class name, double colon (::), and the property name:

Syntax

ClassName::$staticProp;

Let's look at an example:

Example

<?php

class MyClass {

public static $name = "PHP";

}

echo MyClass::$name; // Output: PHP

Try it yourself

Explanation:

public static $name = "PHP";

Declares a static property called $name that belongs to the class MyClass.

MyClass::$name

Outside the class, you use the class name with :: to access static properties or methods.

You don’t need to create an object to access static members. That’s the beauty of static.

PHP - More on Static Properties

A static property can be accessed from a method in the same class using the self keyword and double colon (::):

Example

<?php

class MyClass {

public static $name = "PHP";

public static function getName() {

return self::$name;

}

echo MyClass::$name; // Output: PHP

echo MyClass::getName(); // Output: PHP

Try it yourself

Explanation:

public static $name = "PHP";

Declares a static property called $name that belongs to the class MyClass.

self::$name

Inside the class, you use self:: to refer to static members.

MyClass::$name

Outside the class, you use the class name with :: to access static properties or methods.

To call a static property from a parent class using the parent keyword inside the child class.

Example

<?php

class MyClass {

public static $name = "PHP (Parent)";

}

class MyChild extends MyClass {

public static function getParentName() {

return parent::$name; // Accesses parent's $name

}

// Output

echo MyClass::$name . "<br>"; // PHP (Parent)

echo MyChild::getParentName() . "<br>"; // PHP (Parent)

Try it yourself

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