Question: What is the output of the following?

<?php

$a = 010;
$b = 0xA;
$c = 2;

print $a + $b + $c;

?>

Question: What is the output of the following?

<?php

$a = 20;

function myfunction($b) {
	$a = 30;
	
	global $a, $c;
	return $c = ($b + $a);
}

print myfunction(40) + $c;

?>

Question: What would you replace ??????? with, below, to make the string "Hello, World!" be displayed?

<?php

function myfunction() {
        ???????
	print $string;
}

myfunction("Hello, World!");

?>

Question: What is the output of the following function?

<?php

function &find_variable(&$one, &$two, &$three) {
	
	if($one > 10 && $one < 20) return $one;
	if($two > 10 && $two < 20) return $two;
	if($three > 10 && $three < 20) return $three;
}

$one = 2;
$two = 20;
$three = 15;

$var = &find_variable($one, $two, $three);

$var++;

print "1: $one, 2: $two, 3: $three";

?>

Question: For an arbitrary string $mystring, which of the following checks will correctly determine if the string PHP exists within it?

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();

?>

Question: What are the three access modifiers that you can use in PHP objects?

Question: When checking to see if two variables contain the same instance of an object, which of the following comparisons should be used?

Question: In PHP 5 you can use the ______ operator to ensure that an object is of a particular type. You can also use _______ in the function declaration.

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);

?>