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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 happens when you run the following MySQL Query ? 

  
  CREATE TABLE PRIMARY (ID int);

2.What happens when the code below is executed ? 


  <?php
    class foo
    {
      private $variable;

      function __construct()
      {
        $this->variable = 1;
      }

      function __get($name)
      {
        return $this->$name;
      }
    }
    $a = new foo;
    echo $a->variable;
  ?>

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 ? 

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

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

5.What happens if you execute the code below ? 


<?php
    class someclass
    {
        public $someprop;
        
        function __construct()
        {
            $this->someprop = 1;
        }
    }

    function somefunc(&$instance) {
        unset($instance);
    }

    $instance = new someclass;
    somefunc($instance);
    var_dump($instance);

6.Which from the following list is not an appropriate use of an array?

7.Which of the following functions could be used to break a string into an array?

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

9.What is the output of the following PHP code? define("FOO", 10); $array = [10 => FOO,"FOO" => 20]; print $array[$array[FOO]] * $array["FOO"];

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

11.Consider the following table data and PHP code. What is the outcome? Table data (table name "users" with primary key "id"): id name email ------- ----------- ------------------- 1 anna [email protected] 2 betty [email protected] 3 clara [email protected] 5 sue [email protected] PHP code (assume the PDO connection is correctly established): $dsn = 'mysql:host=localhost;dbname=exam'; $user = 'username'; $pass = '********'; $pdo = new PDO($dsn, $user, $pass); $cmd = "SELECT * FROM users WHERE id = :id"; $stmt = $pdo->prepare($cmd); $id = 3; $stmt->bindParam('id', $id); $stmt->execute(); $stmt->bindColumn(3, $result); $row = $stmt->fetch(PDO::FETCH_BOUND);

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

13.What is the output of the following function? 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";

14.What is wrong with the following code? function duplicate($obj) { $newObj = $obj; return $newObj; } $a = new MyClass(); $a_copy = duplicate($a); $a->setValue(10); $a_copy->setValue(20);

15.The ______ keyword is used to indicate an incomplete class or method, which must be further extended and/or implemented in order to be used.

16.The _______ method will be called automatically when an object is represented as a string.

17. Which of the following list of potential data sources should be considered trusted?

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

19.Consider the following code: header("Location: {$_GET['url']}\"); Which of the following values of $_GET['url'] would cause session fixation?

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

21.A fingerprint of a string can be determined using which of the following?

22.Identify the best approach to compare two variables in a binary-safe fashion

23.Which PCRE regular expression will match the string PhP5-rocks

24.To destroy a PHP session completely, one must which of the following?

25.Consider the following HTML fragment: <select name="???????" multiple> <option value="1">Item #1</option> <!-- ... more options ... --> </select> Which of the following name attributes should be used to capture all of the data from the user in PHP?

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

27.Setting a cookie on the client in PHP 5 can be best accomplished by:

28.How does one create a cookie which will exist only until the browser session is terminated?

29.Setting a HTTP cookie on the client which is not URL-encoded is done how in PHP 5?

30.Which functions would be needed to translate the following string: I love PHP 5 to the following? 5 PHP EVOL I

Finish Quiz

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