. 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 7 - Challenge 2 - Valid Parentheses: A Guide to Checking Bracket Validity in JavaScript

Valid Parentheses: A Guide to Checking Bracket Validity in JavaScript Brackets are a fundamental part of programming languages and are used to group and structure code. In this blog post, we will explore the problem of determining whether a given string of brackets is valid or not using JavaScript. This problem is commonly referred to as the "Valid Parentheses" problem. Understanding the Problem: The problem statement provides a string that consists of three types of brackets: ( , ) , { , } , [ , and ] . The task is to determine whether the brackets in the string are arranged in a valid manner. For a string to be valid, each opening bracket must have a corresponding closing bracket of the same type, and they must be arranged in the correct order. For example, the strings "(){}[]" and "{[()]}" are valid, while "([)]" and "{{]}" are not. Approach: To solve this problem, we can use a stack data structure. The stack will help us keep tr...
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 3 - Unique Email Addresses

Solving the Problem of Counting Unique Email Addresses in JavaScript Introduction:  In today's digital age, email communication is an integral part of our lives. However, dealing with unique email addresses can sometimes be challenging due to variations that arise from period usage and the '+' character. In this blog post, we will explore how to tackle the problem of counting unique email addresses using JavaScript. Problem Statement: We are given a list of email addresses, and our task is to determine the number of unique email addresses. A unique email address consists of a local name and a domain name. The local name may contain periods ('.') and the character '+' which is ignored. Example:  Let's consider the following list of email addresses: "test.email+abc@gmail.com" "test.e.mail@gmail.com" "testemail@gmail.com" In this case, the number of unique email addresses is 1, as all three email addresses map to the same uniqu...
Post a Comment
Read more