PHP test : object oriented PHP-1

Tuesday, September 23, 2014

PHP test : object oriented PHP-1

THEORY

Que. 1 Which method scope prevents a method from being overridden by a subclass?

a) Abstract
b) Protected
c) Final
d) Static

Que.2 PHP recognizes constructors by the name..

a) classname()
b) _construct()
c) function _construct()
d) function __construct()

Que 3 The practice of creating objects based on predefined classes is often referred to as..

a) class creation
b) object creation
c) object instantiation
d) class instantiation

Que.4 The practice of separating the user from the true inner workings of an application through well-known interfaces is known as..

a) Polymorphism
b) Inheritance
c) Encapsulation
d) Abstraction

Que.5 Which version of PHP introduced the instance of keyword?

a) PHP 4
b) PHP 5
c) PHP 5.3
d) PHP 6

PROGRAMS :

Que.1 In the PHP code given below, what is/are the properties?

```
    <?php
```
```
    class Example 
```
```
    {
```
```
        public $name;
```
```
        function Sample()
```
```
        {
```
```
            echo "This is an example";
```
```
        }
```
```
    } 
```
```
    ?>
```

a) echo “This is an example”;
b) public $name;
c) class Example
d) function sample()
Que.2 What will be the output of the following PHP code?

```
<?php
```
```
class MyClass
```
```
{
```
```
}
```
```
 
```
```
$a = new MyClass;
```
```
var_dump(!($a instanceof stdClass));
```
```
?>
```

a) bool(true)
b) bool(false)
c) Error
d) None of the above

Que. 3 What will be the output of the following PHP code?

```
<?php
```
```
class ParentClass
```
```
{
```
```
}
```
```
 
```
```
class MyClass extends ParentClass
```
```
{
```
```
}
```
```
 
```
```
$a = new MyClass;
```
```
 
```
```
var_dump($a instanceof MyClass);
```
```
var_dump($a instanceof ParentClass);
```
```
?>
```

a) bool(false)
bool(false)

b) bool(true)
bool(true)

c) bool(false)
bool(true)

d) bool(true)
bool(false)

Que 4 What will be the output of the following code?

```
    <?php 
```
```
    $foo = 'Bob';              
```
```
    $bar = &$foo;              
```
```
    $bar = "My name is $bar";  
```
```
    echo $bar;
```
```
    echo $foo;
```
```
    ?>
```

a) Error
b) My name is BobBob
c) My name is BobMy name is Bob
d) My name is Bob Bob

Que. 5 What will be the output of the following PHP code?

```
<?php
```
```
interface MyInterface
```
```
{
```
```
}
```
```
 
```
```
class MyClass implements MyInterface
```
```
{
```
```
}
```
```
 
```
```
$a = new MyClass;
```
```
 
```
```
var_dump($a instanceof MyClass);
```
```
var_dump($a instanceof MyInterface);
```
```
?>
```

a) bool(false)
bool(false)

b) bool(true)
bool(true)

c) bool(false)
bool(true)

d) bool(true)
bool(false)

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