. What is static functions in php Skip to main content

What is static functions in php

This article describe the use of static function and their definition.

After Declare a class or methods as static they can access without needing an instantiation of the class.

Because static methods are callable without an instance of the object created, the pseudo-variable $this is not available inside the method declared as static.

Simply, static functions function independently of the class where they belong.
$this means, this is an object of this class. It does not apply to static functions

Entire difference is, you don't get $this supplied inside the static function. If you try to use $this , you'll get a Fatal error: Using $this when not in object context.


Caution

In PHP 5, calling non-static methods statically generates an
E_STRICT level warning.






Warning

In PHP 7, calling non-static methods statically is deprecated, and will
generate an E_DEPRECATED warning. Support for
calling non-static methods statically may be removed in the future.




class Foo {
    public static $static_variable = 'STATIC';
    public static function aStaticMethod() {
        echo 'Called a static function '. __FUNCTION__.' in class'. __CLASS__;
    }
}

class Bar extends Foo {
    public static function anotherStatic(){
        echo parent::$static_variable;
        parent::aStaticMethod();
    }
}
Foo::aStaticMethod();
printf("Access static variable - %s",Foo::$static_variable);
Bar::anotherStatic();

Well, okay, one other difference: an E_STRICT warning is generated by your first example.

In a nutshell, you don't have the object as $this in the second case, as the static method is a function/method of the class not the object instance.

view fork

Source : php.net,  stackoverflow
Labels:

Comments

Post a Comment

Popular posts from this blog

Day 9 - Challenge 1 - Product of Array Except Self

Solving the "Product of Array Except Self" Problem in JavaScript Are you ready to dive into a common coding challenge that not only tests your programming skills but also sharpens your problem-solving mindset? If you're up for the challenge, let's tackle the "Product of Array Except Self" problem together using JavaScript. This problem requires us to return an array where each element at index i is the product of all the elements in the original array except the one at index i . Understanding the Problem:   Imagine you're given an array of integers, let's call it nums . Your task is to create a new array where the value at index i in this new array is the product of all the elements in nums , except the one at index i . In other words, you're calculating the product of all the elements to the left of nums[i] and the product of all the elements to the right of nums[i] , and then multiplying these two products to get the final value at index i ...
Post a Comment
Read more

Day 9 - Challenge 2 - Reverse Linked List

Reversing a Singly Linked List in JavaScript: An In-Place Approach Introduction:   Singly linked lists are fundamental data structures in computer science that consist of a sequence of nodes, each containing data and a reference to the next node in the list. Reversing a singly linked list is a classic problem that challenges programmers to manipulate pointers effectively to achieve the desired outcome. In this blog post, we'll explore the problem of reversing a singly linked list using an in-place approach and provide a step-by-step solution in JavaScript. Problem Statement:   Given the head of a singly linked list, our task is to reverse the list in-place and return its new head. In other words, we need to modify the pointers of the nodes in such a way that the direction of the linked list is reversed. Solution Approach:   To solve this problem, we will iterate through the linked list while maintaining three pointers: previous , current , and next . The previous pointer...
Post a Comment
Read more

Day 8 - Challenge 2 - Move Zeroes to the End

Moving Zeroes to the End: A JavaScript Solution Introduction:   When working with arrays, there are often times when we need to manipulate their elements to achieve a specific goal. One common problem is moving all zeroes to the end of an array while keeping the order of non-zero elements unchanged. In this blog post, we will explore an elegant solution to this problem using JavaScript. We'll discuss the problem statement, the approach we'll take, and provide a step-by-step guide to implementing the solution. The Problem:   Given an array of integers, the task is to move all zeroes to the end of the array while maintaining the relative order of the non-zero elements. This means that after rearranging the array, all the zeroes should be at the end, and the order of the non-zero elements should remain the same. The Approach:   To solve this problem, we can utilize a two-pointer approach. We'll maintain two pointers, one for iterating through the array and another for keepin...
Post a Comment
Read more