Question:
What are the values of $a in $obj_one and $obj_twowhen this script is executed?

<?php
class myClass {
 private $a;

 public function __construct() {
 $this->a = 10;
 }

 public function printValue() {
 print "The Value is: {$this->a}\n";
 }

 public function changeValue($val, $obj = null) {
 if(is_null($obj)) {
 $this->a = $val;
 } else {
 $obj->a = $val;
 }
 }

 public function getValue() {
 return $this->a;
 }
}

$obj_one = new myClass();
$obj_two = new myClass();

$obj_one->changeValue(20, $obj_two);
$obj_two->changeValue($obj_two->getValue(), $obj_one);

$obj_two->printValue();
$obj_one->printValue();

?>
 

A 10,20 
B You cannot modify private member variables of a different class 
C 20,20 
D 10,10 
E 20,10 

+ Answer
C 

+ Report

Mohammad Towhidul Islam

Editor, VCampus

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