25 quizzes found.

What does the following function do, when passed two integer values for $p and $q?

<?php
function magic($p, $q) {
  return ($q == 0)
    ? $p
    : magic($q, $p % $q);
}
?>
  1. Loops infinitely
  2. Switches the values of $p and $q
  3. Determines if they are both even or odd
  4. Determines the greatest common divisor between them
  5. Calculates the modulus between the two

Choose 1 answers

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;

?>
  1. 120
  2. Syntax Error
  3. 60
  4. 70

Choose 1 answers

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

<?php

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

myfunction("Hello, World!");

?>
  1. There is no way to do this
  2. $string = $argv[1];
  3. $string = $_ARGV[0];
  4. list($string) = func_get_args();
  5. $string = get_function_args()

Choose 1 answers

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";

?>
  1. 1: 2, 2: 20, 3: 15
  2. 1: 3, 2:21, 3:16
  3. 1: 2, 2:21, 3:15
  4. 1: 3, 2: 20, 3: 15
  5. 1: 2, 2: 20, 3: 16

Choose 1 answers

Assinging $var with &, the $three variable returned by the function will be incremented with $var

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);

?>
  1. You must use return &$newObj instead
  2. There is nothing wrong with this code
  3. duplicate() must accept its parameter by reference
  4. You must use the clone operator to make a copy of an object
  5. duplicate() must return a reference

Choose 1 answers