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PHP Static Properties

PHP Static Properties

What you'll learn

  • Understand the main ideas in PHP Static Properties.
  • See a working example and explanation to help you learn by doing.
  • Follow a clear path to the next lesson in this topic.

When to use this lesson

Use this lesson when you want to understand the key concepts behind PHP Static Properties.

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PHP Static Properties

Just like static methods, Static Properties can be accessed directly without creating an instance (object) of a class.

A static property belongs to the class itself, not to any individual object. If you change the value of a static property, it changes for the entire program!

Defining and Accessing Static Properties

Static properties are declared with the static keyword. To access a static property, use the Class Name, double colon (::), and the property name (with the $ symbol).

Static Property Example

<?php
class Pi {
  public static $value = 3.14159;
}


// Get static property directly
echo Pi::$value;
?>

Accessing from Inside

Just like static methods, if you need to access a static property from inside a method in the same class, use the self keyword followed by the scope resolution operator: self::$value.

(Note: Because static properties are not tied to an object, they are heavily used to count the total number of objects created, or to hold global configuration settings).

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