Tag: PHP OOP

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 Interfaces in PHP Correctly with Code Examples in 2023

What is an interface in PHP? Interface in PHP or more generally in Object Oriented Programming (OOP) is an idea of having a higher level of representation or more precisely an abstraction over more specialized and concrete classes. That sounds like a philosophical thing.  Worry not, because we have a lot to say about interfaces and what they are in Object Oriented Programming (OOP). Stay tuned till the end to learn more. What’s with the term ‘interface’? The term ‘interface’ changes meaning in different contexts. Perhaps, that’s a reason why it is often a misunderstood term. So, let’s see the different meanings of this term in different contexts. User Interface / User Experience (UI/UX) Designers use the term interface for visible and interactive elements of an application, more generally called the ‘Frontend’ of an application. In fact, the ‘User Interface’ (UI) is an important aspect of human & machine interactions.…

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How to Sort Array of Objects by Property in PHP

sort array of objects by property in PHP
Sort Array of Objects by Property in PHP The article answers how to sort array of objects by property in PHP. Here's a quick overview of the solution. $employees_arr = [ new Employee('5', 'Brian', 90000, '25'), new Employee('1', 'Allen', 60000, '29'), new Employee('2', 'Kylie', 50000, '27'), new Employee('3', 'Jeane', 80000, '35'), new Employee('4', 'Franklin', 75000, '30'), ]; //Sorts the array by the property salary usort($employees_arr, function($a, $b) { return $a->salary - $b->salary; }); If the code doesn't make sense to you now, don't worry! Just stick with the article to the end, and you'll be able to understand all about the code above and perhaps a couple of other interesting PHP stuff! Plus, the article now includes sorting based on two or more properties. Check that out as well. Relevant Content: PHP usort Function The article uses the usort function to sort array of objects by property value in PHP.…

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