Tools and Services Blog Learn Quizzes Smile API Log In / Sign Up
Tools and Services Blog Learn Quizzes Smile API Log In / Sign Up
« Return to the quizzes list
We have updated our privacy policy to let you know that we use cookies to personalise content and ads. We also use cookies to analyse our traffic and we share information about your use of our site and application with our advertising and analytics partners. By using this website or our application you agree to our use of cookies. Learn more about the way this website uses cookies or remove this message.

Advanced PHP Quiz

Topic: PHP/MySQL Last updated on: 01-22-2018

This is an advanced PHP Quiz. It contains questions for seasoned developers about namespaces, traits, handlers and settings, command line execution, exception handling, OOP and other modern PHP features and functions.

1.What is the default value for the "max_execution_time" setting when running PHP as a CLI SAPI ?

2.What happens when the script below is executed ?

    namespace CustomArea;
    ini_set("display_errors", "on");
    function var_dump($a)
      return str_replace("Weird", $a, "Weird stuff can happen");
    $a = "In programming";
    echo var_dump($a);

3.Assuming that the code below is in a file named "test.php" and that PHP has full rights over the file, what happens if the file is executed from the command line without any arguments ?

  exec("rm -f " . dirname(__FILE__) . "/" .  $argv[0]);

4.What is the output of the code below ?

    $a = array('one'=>'php', 'two'=>'javascript', 'three'=>'python');
    $b = array('python', 'javascript', 'php');

    if(array_values(array_reverse($a)) === $b)
      echo 'true';
      echo 'false';

5.When dealing with cloned objects in PHP, which of the following statements are true ?

6.How do you access standard I/O and error streams ?

7.What is the output of the following code block? $a = "The quick brown fox jumped over the lazy dog."; $b = array_map("strtoupper", explode(" ", $a)); foreach ($b as $value) { print "$value "; }

8.What is the output of this code snippet? $a = array(0.001 => 'b', .1 => 'c'); var_dump($a);

9.What is the result of the following code snippet? $array = array('a' => 'John', 'b' => 'Coggeshall', 'c' => array('d' => 'John', 'e' => 'Smith')); function something($array) { extract($array); return $c['e']; } print something($array);

10.Given the following array: $array = array(1,1,2,3,4,4,5,6,6,6,6,3,2,2,2); The fastest way to determine the total number a particular value appears in the array is to use which function?

11.The ____ construct is particularly useful to assign your own variable names to values within an array.

12.Which one of the following XML declarations is NOT valid?

13.Transactions are used to...

14.What does the following function do, when passed two integer values for $p and $q? function magic($p, $q) { return ($q == 0) ? $p: magic($q, $p % $q); }

15.What would go in place of ?????? below to make this script execute without a fatal error? $a = 1; $b = 0; /* ?????? */ $c = $a / $b;

16.What is the difference between the ``include`` and ``require`` language constructs?

17.What is the output of the following? $a = 20; function myfunction($b) { $a = 30; global $a, $c; return $c = ($b + $a); } print myfunction(40) + $c;

18.What is the primary difference between a method declared as static and a normal method?

19.Type-hinting and the instanceof keyword can be used to check what types of things about variables?

20.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?

21.Consider the following code: session_start(); if(!empty($_REQUEST['id']) && !empty($_REQUEST['quantity'])) { $id = scrub_id($_REQUEST['id']); $quantity = scrub_quantity($_REQUEST['quantity']) $_SESSION['cart'][] = array('id' => $id, 'quantity' => $quantity) } /* .... */ What potential security hole would this code snippet produce?

22.What is the best measure one can take to prevent a cross-site request forgery?

23.Which of the following are not valid ways to embed a variable into a string?

24.What variable reference would go in the spots indcated by ????? in the code segment below? $msg = "The Quick Brown Foxed Jumped Over the Lazy Dog"; $state = true; $retval = ""; for ($i = 0; (isset(??????)); $i++) { if($state) { $retval .= strtolower(?????); } else { $retval .= strtoupper(?????); } $state = !$state; } print $retval;

25.When comparing two strings, which of the following is acceptable?

26.Consider the following script: $oranges = 10; $apples = 5; $string = "I have %d apples and %d oranges"; ??????? What could be placed in place of ?????? to output the string: "I have 5 apples and 10 oranges"

27.To destroy one variable within a PHP session you should use which method in PHP 5?

28.If you would like to change the session ID generation function, which of the following is the best approach for PHP 5?

29.To force a user to redirect to a new URL from within a PHP 5 script, which of the following should be used?

30.Which of the following is not a valid fopen() access mode:

Finish Quiz