In PHP, static and self are both keywords used to refer to classes and class members, but they have different meanings and behaviors.
static keyword:
- When used in the context of a class member (property or method),
staticrefers to the class itself rather than an instance of the class. - A static property or method belongs to the class itself, and it can be accessed without creating an instance of the class.
- Static properties are shared among all instances of the class, and their values are maintained across different instances.
- Static methods can be called directly on the class without instantiating it.
- Example:
class MyClass {
public static $myStaticProperty = 'Hello';
public static function myStaticMethod() {
echo self::$myStaticProperty;
}
}
echo MyClass::$myStaticProperty; // Output: Hello
MyClass::myStaticMethod(); // Output: Hello
self keyword:
- When used in the context of a class,
selfrefers to the class itself and is used to access its own static members (properties and methods). selfis typically used within the class to refer to its own static members.- It does not allow for late static binding, meaning it always refers to the class in which it is used, even in the case of inheritance or overridden methods.
- Example:
class MyClass {
public static $myStaticProperty = 'Hello';
public static function myStaticMethod() {
echo self::$myStaticProperty;
}
}
class AnotherClass extends MyClass {
public static $myStaticProperty = 'World';
}
MyClass::myStaticMethod(); // Output: Hello
AnotherClass::myStaticMethod(); // Output: Hello (not World)
In summary, static is used to define and access static members of a class, while self is used to refer to the current class and access its own static members.
I’m Abhishek, a DevOps, SRE, DevSecOps, and Cloud expert with a passion for sharing knowledge and real-world experiences. I’ve had the opportunity to work with Cotocus and continue to contribute to multiple platforms where I share insights across different domains:
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