{"id":112000,"date":"2025-09-15T13:04:11","date_gmt":"2025-09-15T07:34:11","guid":{"rendered":"https:\/\/www.mygreatlearning.com\/blog\/php-oop-interview-questions\/"},"modified":"2025-09-15T12:12:27","modified_gmt":"2025-09-15T06:42:27","slug":"php-oop-interview-questions","status":"publish","type":"post","link":"https:\/\/www.mygreatlearning.com\/blog\/php-oop-interview-questions\/","title":{"rendered":"33+ PHP OOP Interview Questions &amp; Answers"},"content":{"rendered":"\n<p>Object-Oriented Programming (OOP) in PHP is a way of writing code in which we keep data and its functions in one place, inside objects. This method is very useful when the project is big, because understanding and managing the code becomes easy.<\/p>\n\n\n\n<p>Nowadays, every good PHP job checks OOP knowledge. It is not enough to just know basic coding. Companies want to see whether you will be able to write clean and reusable code in real-life projects or not.<\/p>\n\n\n\n<p>So if you want to become a PHP developer, you must be well-versed in basic OOP concepts such as classes, objects, inheritance, polymorphism, encapsulation, and abstraction. This guide contains 33+ PHP OOP interview questions that will prepare you from beginner to advanced level.<\/p>\n\n\n\n    <div class=\"courses-cta-container\">\n        <div class=\"courses-cta-card\">\n            <div class=\"courses-cta-header\">\n                <div class=\"courses-learn-icon\"><\/div>\n                <span class=\"courses-learn-text\">Free Course<\/span>\n            <\/div>\n            <p class=\"courses-cta-title\">\n                <a href=\"https:\/\/www.mygreatlearning.com\/academy\/learn-for-free\/courses\/php-for-beginners\" class=\"courses-cta-title-link\">PHP for Beginners<\/a>\n            <\/p>\n            <p class=\"courses-cta-description\">Enroll in our free PHP course to learn how to code with this popular server-side scripting language. Learn PHP basics like variables, data types, control statements, loops, and functions through hands-on implementations.<\/p>\n            <div class=\"courses-cta-stats\">\n                <div class=\"courses-stat-item\">\n                    <div class=\"courses-stat-icon courses-user-icon\"><\/div>\n                    <span>2.25 Hrs<\/span>\n                <\/div>\n                <div class=\"courses-stat-item\">\n                    <div class=\"courses-stat-icon courses-star-icon\"><\/div>\n                    <span>51.9K+ Learners<\/span>\n                <\/div>\n            <\/div>\n            <a href=\"https:\/\/www.mygreatlearning.com\/academy\/learn-for-free\/courses\/php-for-beginners\" class=\"courses-cta-button\">\n                Enroll Free Now\n                <div class=\"courses-arrow-icon\"><\/div>\n            <\/a>\n        <\/div>\n    <\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"basic-oop-concept-questions\">Basic OOP Concept Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-what-is-object-oriented-programming-oop\">1. What is Object-Oriented Programming (OOP)?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> OOP is a way to write code. It uses \"objects\" to store data and functions together. The main ideas are encapsulation, inheritance, polymorphism, and abstraction.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-what-are-the-four-main-pillars-of-oop\">2. What are the four main pillars of OOP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Encapsulation:<\/strong> Put data and functions together. Control who can use them.<\/li>\n\n\n\n<li><strong>Inheritance:<\/strong> Make new classes from old classes.<\/li>\n\n\n\n<li><strong>Polymorphism:<\/strong> Same name, different actions.<\/li>\n\n\n\n<li><strong>Abstraction:<\/strong> Hide hard parts. Show only simple parts.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-what-is-a-class-in-php\">3. What is a class in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> A class is like a plan. It tells how to make objects. It has properties (data) and methods (functions).<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass Car {\n    public $color;\n    private $engine;\n    \n    public function start() {\n        return &quot;Car started&quot;;\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"4-what-is-an-object-in-php\">4. What is an object in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> An object is made from a class. You use the <code>new<\/code> word to make it. It holds real data.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n$myCar = new Car();\n$myCar-&gt;color = &quot;red&quot;;\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"5-what-are-the-different-visibility-levels-in-php\">5. What are the different visibility levels in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>public:<\/strong> Everyone can see and use it.<\/li>\n\n\n\n<li><strong>private:<\/strong> Only the same class can use it.<\/li>\n\n\n\n<li><strong>protected:<\/strong> The class and its children can use it.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"6-what-is-the-difference-between-this-and-self\">6. What is the difference between $this and self?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>$this<\/code> points to the current object.<\/li>\n\n\n\n<li><code>self<\/code> points to the current class. Use it for static things.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"7-what-is-a-constructor-in-php\">7. What is a constructor in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> A constructor runs when you make a new object. It uses <code>__construct()<\/code>. You can set up the object here.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass User {\n    private $name;\n    \n    public function __construct($name) {\n        $this-&gt;name = $name;\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"8-what-is-a-destructor-in-php\">8. What is a destructor in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> A destructor runs when an object is deleted. It uses <code>__destruct()<\/code>. You can clean up things here.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass Database {\n    public function __destruct() {\n        \/\/ Clean up database connection\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"9-what-is-method-overloading-in-php\">9. What is method overloading in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> PHP does not have real method overloading. But you can fake it. Use <code>__call()<\/code> method or default parameters.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"10-what-are-static-methods-and-properties\">10. What are static methods and properties?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Static things belong to the class. They do not belong to objects. Use <code>::<\/code> to access them.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass MathHelper {\n    public static $pi = 3.14159;\n    \n    public static function add($a, $b) {\n        return $a + $b;\n    }\n}\n\necho MathHelper::$pi;\necho MathHelper::add(5, 3);\n<\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"intermediate-concept-questions\">Intermediate Concept Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"11-what-is-inheritance-in-php\">11. What is inheritance in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Inheritance lets a class get things from another class. Use the <code>extends<\/code> word.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass Animal {\n    protected $name;\n    \n    public function eat() {\n        return &quot;Eating...&quot;;\n    }\n}\n\nclass Dog extends Animal {\n    public function bark() {\n        return &quot;Woof!&quot;;\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"12-what-is-method-overriding\">12. What is method overriding?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Method overriding happens when a child class makes a new version of a parent method.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass Shape {\n    public function area() {\n        return 0;\n    }\n}\n\nclass Circle extends Shape {\n    private $radius;\n    \n    public function area() {\n        return 3.14 * $this-&gt;radius * $this-&gt;radius;\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"13-what-is-an-abstract-class\">13. What is an abstract class?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> An abstract class cannot make objects. It may have abstract methods. Child classes must make these methods.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nabstract class Vehicle {\n    abstract public function start();\n    \n    public function stop() {\n        return &quot;Vehicle stopped&quot;;\n    }\n}\n\nclass Car extends Vehicle {\n    public function start() {\n        return &quot;Car started&quot;;\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"14-what-is-an-interface-in-php\">14. What is an interface in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> An interface is like a contract. It tells what methods a class must have. All methods are public and abstract.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\ninterface Drawable {\n    public function draw();\n}\n\nclass Circle implements Drawable {\n    public function draw() {\n        return &quot;Drawing a circle&quot;;\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"15-whats-the-difference-between-abstract-classes-and-interfaces\">15. What's the difference between abstract classes and interfaces?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Abstract classes:<\/strong> Can have real methods and abstract methods. Can have properties and constructors.<\/li>\n\n\n\n<li><strong>Interfaces:<\/strong> Only method names. All methods are public and abstract.<\/li>\n\n\n\n<li><strong>Inheritance:<\/strong> Class <code>extends<\/code> one abstract class. Class <code>implements<\/code> many interfaces.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"16-what-is-polymorphism-in-php\">16. What is polymorphism in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Polymorphism means different objects can act the same way. They use the same method names but do different things.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\ninterface Animal {\n    public function makeSound();\n}\n\nclass Dog implements Animal {\n    public function makeSound() { return &quot;Woof!&quot;; }\n}\n\nclass Cat implements Animal {\n    public function makeSound() { return &quot;Meow!&quot;; }\n}\n\nfunction animalSound(Animal $animal) {\n    return $animal-&gt;makeSound();\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"17-what-are-traits-in-php\">17. What are traits in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Traits help you reuse code. You can put the same methods in many classes.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\ntrait Logger {\n    public function log($message) {\n        echo &quot;Log: &quot; . $message;\n    }\n}\n\nclass User {\n    use Logger;\n}\n\nclass Order {\n    use Logger;\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"18-what-is-encapsulation\">18. What is encapsulation?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Encapsulation means hiding inside details. Only show what others need to use. Use public methods to control access.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"19-what-is-composition-vs-inheritance\">19. What is composition vs inheritance?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Inheritance:<\/strong> \"is-a\" relationship. Dog is an Animal.<\/li>\n\n\n\n<li><strong>Composition:<\/strong> \"has-a\" relationship. Car has an Engine.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass Engine {\n    public function start() { return &quot;Engine started&quot;; }\n}\n\nclass Car {\n    private $engine;\n    \n    public function __construct() {\n        $this-&gt;engine = new Engine();\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"20-what-is-the-final-keyword\">20. What is the final keyword?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> The <code>final<\/code> word stops things. Final class cannot be extended. Final method cannot be overridden.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nfinal class Database {\n    \/\/ Cannot be extended\n}\n\nclass Parent {\n    final public function importantMethod() {\n        \/\/ Cannot be overridden\n    }\n}\n<\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"advanced-concept-questions\">Advanced Concept Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"21-what-are-magic-methods-in-php\">21. What are magic methods in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Magic methods are special methods. PHP calls them automatically in some situations. Common ones are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>__construct()<\/code>, <code>__destruct()<\/code><\/li>\n\n\n\n<li><code>__get()<\/code>, <code>__set()<\/code><\/li>\n\n\n\n<li><code>__call()<\/code>, <code>__callStatic()<\/code><\/li>\n\n\n\n<li><code>__toString()<\/code>, <code>__clone()<\/code><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"22-what-is-the-__autoload-function\">22. What is the __autoload() function?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> <code>__autoload()<\/code> was used to load class files automatically. It is old now. Modern PHP uses <code>spl_autoload_register()<\/code>.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nspl_autoload_register(function ($className) {\n    include $className . &#039;.php&#039;;\n});\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"23-what-is-method-chaining\">23. What is method chaining?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Method chaining lets you call many methods on one object. Each method returns <code>$this<\/code>. You can write them in one line.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass QueryBuilder {\n    private $query = &#039;&#039;;\n    \n    public function select($fields) {\n        $this-&gt;query .= &quot;SELECT $fields &quot;;\n        return $this;\n    }\n    \n    public function from($table) {\n        $this-&gt;query .= &quot;FROM $table &quot;;\n        return $this;\n    }\n}\n\n$query = (new QueryBuilder())\n    -&gt;select(&#039;*&#039;)\n    -&gt;from(&#039;users&#039;);\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"24-what-is-the-singleton-pattern\">24. What is the Singleton pattern?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Singleton makes sure only one object exists. You cannot make more than one.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass Database {\n    private static $instance = null;\n    \n    private function __construct() {}\n    \n    public static function getInstance() {\n        if (self::$instance === null) {\n            self::$instance = new self();\n        }\n        return self::$instance;\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"25-what-is-dependency-injection\">25. What is dependency injection?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Dependency injection gives a class what it needs from outside. The class does not make its own dependencies.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass EmailService {\n    private $mailer;\n    \n    public function __construct(MailerInterface $mailer) {\n        $this-&gt;mailer = $mailer;\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"26-what-is-the-difference-between-and-when-comparing-objects\">26. What is the difference between == and === when comparing objects?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>==<\/code> compares what is inside objects (properties).<\/li>\n\n\n\n<li><code>===<\/code> compares if objects are exactly the same (same instance).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"27-what-is-object-cloning-in-php\">27. What is object cloning in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Object cloning makes a copy of an object. Use the <code>clone<\/code> word. You can customize copying with <code>__clone()<\/code>.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass User {\n    public $name;\n    \n    public function __clone() {\n        \/\/ Custom cloning logic\n    }\n}\n\n$user1 = new User();\n$user2 = clone $user1;\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"28-what-is-late-static-binding\">28. What is late static binding?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Late static binding helps with inheritance. Use <code>static::<\/code> instead of <code>self::<\/code>. It points to the class that was called.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass A {\n    public static function who() {\n        echo __CLASS__;\n    }\n    \n    public static function test() {\n        static::who(); \/\/ Late static binding\n    }\n}\n\nclass B extends A {\n    public static function who() {\n        echo __CLASS__;\n    }\n}\n\nB::test(); \/\/ Outputs: B\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"29-what-are-anonymous-classes-in-php\">29. What are anonymous classes in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Anonymous classes are classes without names. They are good for one-time use.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n$logger = new class {\n    public function log($message) {\n        echo $message;\n    }\n};\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"30-what-is-the-factory-pattern\">30. What is the Factory pattern?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Factory pattern makes objects. You do not need to know the exact class names.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass ShapeFactory {\n    public static function create($type) {\n        switch($type) {\n            case &#039;circle&#039;: return new Circle();\n            case &#039;square&#039;: return new Square();\n        }\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"31-what-is-the-observer-pattern\">31. What is the Observer pattern?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Observer pattern connects objects. When one object changes, it tells all other objects.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\ninterface Observer {\n    public function update($data);\n}\n\nclass Subject {\n    private $observers = &#x5B;];\n    \n    public function attach(Observer $observer) {\n        $this-&gt;observers&#x5B;] = $observer;\n    }\n    \n    public function notify($data) {\n        foreach($this-&gt;observers as $observer) {\n            $observer-&gt;update($data);\n        }\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"32-what-is-namespace-in-php\">32. What is namespace in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Namespaces prevent name problems. They group classes, functions, and constants together.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nnamespace App\\Models;\n\nclass User {\n    \/\/ User class in App\\Models namespace\n}\n\n$user = new \\App\\Models\\User();\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"33-what-is-the-instanceof-operator\">33. What is the instanceof operator?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> <code>instanceof<\/code> checks if an object is from a specific class or implements an interface.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nif ($object instanceof User) {\n    \/\/ $object is a User instance\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"34-what-is-reflection-in-php\">34. What is reflection in PHP?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Reflection lets you look at and change classes, methods, and properties while the program runs.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n$reflection = new ReflectionClass(&#039;User&#039;);\n$methods = $reflection-&gt;getMethods();\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"35-what-are-generators-in-php-oop-context\">35. What are generators in PHP OOP context?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> Generators are special functions. They can stop and start again. Good for big data sets. Saves memory.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass DataProcessor {\n    public function processLargeDataset() {\n        for ($i = 0; $i &amp;lt; 1000000; $i++) {\n            yield $this-&gt;processItem($i);\n        }\n    }\n}\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"36-what-is-the-difference-between-composition-and-aggregation\">36. What is the difference between composition and aggregation?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Composition:<\/strong> Strong \"has-a\" relationship. If Car dies, Engine dies too.<\/li>\n\n\n\n<li><strong>Aggregation:<\/strong> Weak \"has-a\" relationship. If Department dies, Employees still live.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"37-what-are-php-8-oop-features\">37. What are PHP 8 OOP features?<\/h3>\n\n\n\n<p><strong>Answer:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Constructor property promotion<\/strong> (shorter way to set properties)<\/li>\n\n\n\n<li><strong>Union types<\/strong> (property can be multiple types)<\/li>\n\n\n\n<li><strong>Match expressions<\/strong> (better switch)<\/li>\n\n\n\n<li><strong>Named arguments<\/strong> (call functions with parameter names)<\/li>\n\n\n\n<li><strong>Attributes<\/strong> (like annotations)<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nclass User {\n    public function __construct(\n        public string $name,\n        public int $age\n    ) {}\n}\n<\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"best-practices-tips\">Best Practices &amp; Tips<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"key-oop-best-practices\">Key OOP Best Practices:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SOLID Principles:<\/strong> Single Responsibility, Open\/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion<\/li>\n\n\n\n<li>Use composition more than inheritance<\/li>\n\n\n\n<li>Program to interfaces, not implementations<\/li>\n\n\n\n<li>Use clear class and method names<\/li>\n\n\n\n<li>Keep classes focused and simple<\/li>\n\n\n\n<li>Keep classes separate from each other<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"common-interview-problems\">Common Interview Problems:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Know the difference between <code>self::<\/code>, <code>static::<\/code>, and <code>parent::<\/code><\/li>\n\n\n\n<li>Know when to use abstract classes vs interfaces<\/li>\n\n\n\n<li>Understand object lifecycle and memory management<\/li>\n\n\n\n<li>Be able to make common design patterns<\/li>\n\n\n\n<li>Understand autoloading and namespaces<\/li>\n<\/ul>\n\n\n\n<p>This guide covers all important PHP OOP concepts. These questions are common in interviews. The guide goes from basic ideas to advanced patterns and new PHP features.<\/p>\n\n\n\n<p>Also Read:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.mygreatlearning.com\/blog\/top-php-projects\/\">PHP Projects with Source Code<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mygreatlearning.com\/blog\/laravel-interview-questions\/\">Top Laravel Interview Questions<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mygreatlearning.com\/blog\/oops-interview-questions\/\">Top General OOPs Interview Questions and Answers<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mygreatlearning.com\/blog\/oops-concepts-in-java\/\">OOP in Java with Examples<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mygreatlearning.com\/blog\/oops-concepts-in-python\/\">OOPs in Python<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Get prepared for PHP developer interviews with 33+ OOP questions and answers, covering key topics from classes to advanced patterns. <\/p>\n","protected":false},"author":41,"featured_media":112003,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25860],"tags":[36891],"content_type":[],"class_list":["post-112000","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software","tag-php"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>33+ PHP OOP Interview Questions &amp; 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