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 
E a: 10, b: 10 

+ Answer
C 

+ Report

Mohammad Towhidul Islam

Editor, VCampus

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