This is the questions and answers section on "Object Oriented PHP" with the explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand.
Object Oriented PHP Questions
Online Test Name | Object Oriented PHP |
Exam Type | Multiple Choice Questions |
Category | Computer Science Engineering Quiz |
Number of Questions | 30 |
2. Which of the following statements is/are true about Constructors in PHP?
[i] PHP 4 introduced class constructors.
[ii] Constructors can accept parameters.
[iii] Constructors can call class methods or other functions
[iv] Class constructors can call on other constructors.
- A. [ii] and [iii]
- B. All of the mentioned
- C. None of the mentioned
- D. [ii], [iii] and [iv]
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3. PHP recognizes constructors by the name.
- A. classname[]
- B. _construct[]
- C. function _construct[]
- D. function __construct[]
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Answer & Explanation
Answer: Option D
Explanation:
A double underscore followed by the construct keyword. Its syntax is function __construct [[ argument1, argument2,.....]] { Class Initialization code }
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4. Which version of PHP introduced the instanceof keyword?
- A. PHP 4
- B. PHP 5
- C. PHP 5.3
- D. PHP 6
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Answer: Option B
Explanation:
Using instanceof keyword we can determine whether an object is an instance of a class. $manager = new Employee[] ¦ if [$manager instanceof Employee] echo "True;
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5. Which one of the following functions is used to determine whether a class exists?
- A. exist[]
- B. exist_class[]
- C. class_exist[]
- D. __exist[]
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Answer & Explanation
Answer: Option C
Explanation:
The class_exist[] function returns true or false according to whether the class exists within the currently executing script content.
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Mock Tests & Online Quizzes
This set of PHP Multiple Choice Questions & Answers [MCQs] focuses on “Advanced Object-Oriented PHP”. 1. Which of the following advanced OOP features is/are not supported by PHP? a] i] Answer: c 2. Which version of PHP introduced the advanced concepts of OOP? Answer: b 3. Which one of the following is the right way to clone an
object? Answer: b 4. The class from which the child
class inherits is called ________ a] Only i] Answer: d 5. Which of the following is/are true for an abstract class? Answer: a 6. If one intends to create a model that will be assumed by a number of closely related objects, which class must be used? Answer: c 7. If your object must inherit behavior from a number of sources you must use a/ani] Method overloading
ii] Multiple Inheritance
iii] Namespaces
iv] Object Cloning
b] ii]
c] i] and ii]
d] iii] and iv]
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Explanation: The advanced OOP features are: Object cloning, Inheritance, Interfaces, Abstract classes, and Namespaces.
a] PHP 4
b] PHP 5
c] PHP 5.3
d] PHP 6
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Explanation: Advanced concepts of OOP were introduced in PHP version 5.
a] _clone[targetObject];
b] destinationObject = clone targetObject;
c] destinationObject = _clone[targetObject];
d] destinationObject = clone[targetObject];
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Explanation: You can clone an object by prefacing it with the clone keyword. A copy of an object is created by using the clone keyword. $copy_of_object = clone $object;i] Child class
ii] Parent class
iii] Super class
iv] Base class
b] ii], iii] and iv]
c] Only iii]
d] ii] and iv]
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Explanation: The class whose properties are inherited by child class is called Base Class or Parent class.
i] Abstract classes in PHP are declared with the help of abstract keyword.
ii] A class is
declare abstract by using the keyword implements.
iii] It is a class that really isn’t supposed to ever be instantiated but instead serves as a base class.
iv] Attempting to instantiate an abstract class results in an error.
a] Only i]
b] Only iii]
c] ii] and iv]
d] ii], iii] and iv]
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Explanation: The abstract classes are the classes in which at least one method need to be
abstract. Abstract classes in PHP are declared with the help of abstract keyword.
a] Normal class
b] Static class
c] Abstract class
d] Interface
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Explanation: The abstract classes are the classes in which at least one method need to be abstract.
Abstract classes in PHP are declared with the help of keyword abstract. The use of class abstract are that all base classes implementing abstract class should give implementation of abstract methods declared in parent class.
a] Interface
b] Object
c] Abstract class
d] Static class
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Answer: a
Explanation: An interface in PHP consists of methods that have no implementations, i.e. the interface methods are abstract methods. The methods in the interfaces must have public visibility scope. The interfaces are different from classes as the class can inherit from one class only whereas the class can implement one or more interfaces.
8. Which method is used to tweak an object’s cloning behavior?
a] clone[]
b] __clone[]
c] _clone
d] object_clone[]
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Answer: b
Explanation: A copy of an object is created by using the clone keyword, which calls the object’s __clone[] method.
9. Which feature allows us to call more than one method or function of the class in single instruction?
a] Typecasting
b] Method Including
c] Method adding
d] Method chaining
View Answer
Answer: d
Explanation: When many methods are called in a single instruction in PHP, it is called method chaining. Following is a basic example of method chaining in php:
$a = new Order[]; $a->CreateOrder[]->sendOrderEmail[]->createShipment[];
10. Which magic method is used to implement overloading in PHP?
a] __call
b] __invoke
c] __wakeup
d] __unset
View Answer
Answer: a
Explanation: When a class
implements __call[], then an object of that class is called with a method that doesn’t exist, __call[] is called instead.
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