Tag: class

PHP Class Constants: Tutorial with Code Examples (2023)

What is a PHP Class Constant? PHP class constant is a value defined within a class and cannot be changed during the execution of the script. They are similar to variables, but unlike variables, their value remains constant throughout the script execution. In object-oriented programming, class constants are used to define data that belongs to a class rather than a specific instance of a class. They offer several advantages, such as better code readability and centralized data management. PHP Class Constant Code Example <?php class Math { public const PI = 3.14159265359; public static function areaOfCircle($radius) { return self::PI * $radius * $radius; } public static function circumferenceOfCircle($radius) { return 2 * self::PI * $radius; } } echo Math::areaOfCircle(5); // Output: 78.539816339744 echo Math::circumferenceOfCircle(5); // Output: 31.4159265358979 ?> Article Highlights Class constants are immutable values that are associated with a specific class in PHP. Class constants are declared using the…

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Using Abstract Classes Correctly with PHP Code Examples in 2023

What is an Abstract Class in PHP An abstract class in PHP is a class with at least one not implemented method. You cannot use an abstract class directly but must extend it with a child class. The child classes are supposed to provide an implementation for these abstract methods. Using an Abstract Class in PHP Create an abstract class in PHP by adding the modifier "abstract" before noting the access level. Do the same thing for any methods you want to require child classes to implement. You can see the below for an example. Abstract Class Code Example <?php abstract public class Bird { abstract public function fly() {} public function walk() { // do something concrete here } public class Flamingo extends Bird { public function fly() { // do something here } } But why and what is the purpose of all this? That’s precisely why we…

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15+ Array of Objects PHP Code Examples | Easy 2023 Tutorial

How to work with an array of objects in PHP code Can you have arrays of objects in PHP Yes, you can definitely create, store, filter, merge and work with an array of objects in PHP. You can decode JSON objects as arrays as well as create array collections of PHP arrays. PHP offers many solutions to work with an array of objects. This article will break down 2 common scenarios when working with arrays of objects in PHP. Visitors come to us many times to ask questions about working with PHP classes and objects as well as JSON objects. Both situations are common but do have unique requirements. Let's first get into PHP classes and objects. Then we will follow it up with Working with PHP Classes and Objects PHP was originally designed as a purely procedural language. Starting in PHP 4 and greatly extending into PHP 5, it…

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How to Use PHP Classes Correctly with Code Examples in 2023

class in php
What is a Class in PHP . A class is a fundamental concept in object oriented programming so the article features a section about PHP OOP basics. If you’re already familiar with OOP concepts you can jump straight to the example following the OOP basics section. However, we recommend staying tuned from beginning to end to gain some really good insights about PHP OOP and especially about the concept of a class in PHP.  Class and Object - PHP OOP Basics A class is a fundamental concept in object-oriented programming. It is a blueprint or a template that defines an entity. The cool thing about a class is that you can create objects based on it. Let’s understand this class and object concept with an analogy. Properties  A master plan (class) forms a baseline for producing various cars in the image above. These cars have a color property that differs.…

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Filter Array of Objects by Key: 5 PHP Code Examples (2023)

filter array of objects by key in PHP
Filter Array of Objects PHP Code Example The following code snippet is a quick way to filter array of objects by key using the array_filter function. We recommend using the method for most array filtering use cases. Feel free to use this snippet and then follow along for more explanation. <?php // Dummy data just to populate function. // I'm creating a json string as its an efficient way to create an array of objects. // You can ignore this part and replace $objectsArray with your array. $content = '[{"type": "cat", "name": "charles"}, {"type": "dog", "name": "sam"}}, {"type": "donkey": "name": "frank"}]'; $objectsArray = json_decode($content); //Array_filter to filter objects with cat as type // This is where the work is done. $filtered_arr = array_filter( $objectsArray, function($key){ return $key === 0; }, ARRAY_FILTER_USE_KEY); //Gets the filtered array. print_r($filtered_arr); /* OUTPUT Array ( [0] => stdClass ( [name] => charles [type] => cat…

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