PHP Object Oriented Programming, PHP

Question: What is wrong with the following code?
<?php

function duplicate($obj) {
$newObj = $obj;
return $newObj;
}

$a = new MyClass();

$a_copy = duplicate($a);

$a->setValue(10);
$a_copy->setValue(20);

?>
A
You must use return &$newObj instead

B
There is nothing wrong with this code

C
duplicate() must accept its parameter by reference

D
You must use the clone operator to make a copy of an object

E
duplicate() must return a reference

Note: Not available
1. Report
Question: How can you modify the copy of an object during a clone operation?
A
Put the logic in the object's constructor to alter the values

B
Implment your own function to do object copying

C
Implement the object's __clone() method

D
Implement __get() and __set() methods with the correct logic

E
Implement the __copy() method with the correct logic

Note: Not available
1. Report
Question: What is the primary difference between a method declared as static and a normal method?
A
Static methods can only be called using the :: syntax and never from an instance

B
Static methods do not provide a reference to $this

C
Static methods cannot be called from within class instances

D
Static methods don't have access to the self keyword

E
There is no functional difference between a static and non-static method

Note: Not available
1. Report

Question: What is the output of the following script?
<?php

class ClassOne {
 protected $a = 10;

 public function changeValue($b) {
 $this->a = $b;
 }
}

class ClassTwo extends ClassOne {

 protected $b = 10;

 public function changeValue($b) {
 $this->b = 10;
 parent::changeValue($this->a + $this->b);
 }

 public function displayValues() {
 print "a: {$this->a}, b: {$this->b}\n";
 }
}

$obj = new ClassTwo();

$obj->changeValue(20);
$obj->changeValue(10);

$obj->displayValues();

?>
A a: 30, b: 30

B a: 30, b: 20

C a: 30, b: 10

D a: 20, b: 20

Ea: 10, b: 10

Note: Not available

Report

Question: The ______ keyword is used to indicate an incomplete class or method, which must be further extended and/or implemented in order to be used.
A
final

B
protected

C
incomplete

D
abstract

E
implements

Note: Not available
1. Report
Question: In PHP 5's object model, a class can have multiple ______ but only a single direct
________.
A
None

B
interfaces, child

C
children, interface

D
interfaces, parent

E
parents, interface

Note: Not available
1. Report
Question: The _______ method will be called automatically when an object is represented as a string.
A
getString()

B
__get()

C
__value()

D
__toString()

E
__getString()

Note: Not available
1. Report
Question: When an object is serialized, which method will be called, automatically, providing your object with an opportunity to close any resources or otherwise prepare to be serialized?
A
__destroy()

B
__serialize()

C
__destruct()

D
__shutdown()

E
__sleep()

Note: Not available
1. Report
Question: Which two internal PHP interfaces provide functionality which allow you to treat an object like an array?
A
iteration

B
arrayaccess

C
objectarray

D
iterator

E
array

Note: Not available
1. Report
Question: Which scope is present in method not in field?
A
public

B
private

C
abstract

D
protected

Note: Not available
1. Report

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Question: What is wrong with the following code?
<?php

function duplicate($obj) {
$newObj = $obj;
return $newObj;
}

$a = new MyClass();

$a_copy = duplicate($a);

$a->setValue(10);
$a_copy->setValue(20);

?>

Question: How can you modify the copy of an object during a clone operation?

Question: What is the primary difference between a method declared as static and a normal method?

Question: The `______` keyword is used to indicate an incomplete class or method, which must be further extended and/or implemented in order to be used.

Question: In PHP 5's object model, a class can have multiple `` but only a single direct
`__`.

Question: The `_______` method will be called automatically when an object is represented as a string.

Question: When an object is serialized, which method will be called, automatically, providing your object with an opportunity to close any resources or otherwise prepare to be serialized?

Question: Which two internal PHP interfaces provide functionality which allow you to treat an object like an array?

Question: Which scope is present in method not in field?

Question: What is wrong with the following code?<?php function duplicate($obj) { $newObj = $obj; return $newObj;} $a = new MyClass(); $a_copy = duplicate($a); $a->setValue(10);$a_copy->setValue(20); ?>

Question: How can you modify the copy of an object during a clone operation?

Question: What is the primary difference between a method declared as static and a normal method?

Question: The ______ keyword is used to indicate an incomplete class or method, which must be further extended and/or implemented in order to be used.

Question: In PHP 5's object model, a class can have multiple ______ but only a single direct ________.

Question: The _______ method will be called automatically when an object is represented as a string.

Question: When an object is serialized, which method will be called, automatically, providing your object with an opportunity to close any resources or otherwise prepare to be serialized?

Question: Which two internal PHP interfaces provide functionality which allow you to treat an object like an array?

Question: Which scope is present in method not in field?

Question: What is wrong with the following code?
<?php

function duplicate($obj) {
$newObj = $obj;
return $newObj;
}

$a = new MyClass();

$a_copy = duplicate($a);

$a->setValue(10);
$a_copy->setValue(20);

?>

Question: The `______` keyword is used to indicate an incomplete class or method, which must be further extended and/or implemented in order to be used.

Question: In PHP 5's object model, a class can have multiple `` but only a single direct
`__`.

Question: The `_______` method will be called automatically when an object is represented as a string.