PHP Quiz

Small animation done during the AFUP Toulouse cocktail on 19 March 2013.
The questions are taken from exercises Zend certification preparation.

Transcript

1. PHP Quiz Tuesday 13th of March 2013 @AFUP_Toulouse thomas@gasc.fr @methylbro
2. 1. What is the output of the following code? $a = 1; ++$a; $a *= $a; echo $a--; a. 4 b. 3 c. 5 d. 0
3. 2. Which of the following will generate an E_NOTICE error assuming the following code? <?php $array = array( array( 1, 2 ), 'a' => array( 'b' => 1, 'c' ) ); a. $array[] = 1; b. echo $array[5][2]; c. echo $array[5][2] = 2; d. isset($array[7][3][1]);
4. 3. Which of the following error types cannot be caught by setting up a custom error handler? a. E_WARNING b. E_ERROR c. E_USER_ERROR d. E_PARSE e. E_NOTICE
5. 4. When PHP is running on a command line, what super-global will contain the command line arguments specified? a. $_SERVER b. $_ENV c. $GLOBALS d. $_POST e. $_ARGV
6. Function world() is defined in the namespace myapp\utils\hello. Your code is in the namespace myapp. 5. What is the correct way to import the hello namespace so you can use the world() function? a. use hello b. use utils\hello c. use myapp\utils\hello d. use myapp\utils\hello\world
7. 6. Which interface can be used to allow an object to be executed in a foreach loop? a. ArrayObject b. Iterator c. ArrayList d. Hashtable
8. 7. What is the output of the following script? <?php function fibonacci ($x1, $x2) { return $x1 + $x2; } $x1 = 0; $x2 = 1; for ($i = 0; $i<10; $i++) { echo fibonacci( $x1, $x2 ).','; } a. 1,2,3,4,5,6,7,8,9 b. 1,2,3,4,5,6,7,8,9,10, c. 1,2,3,5,8,13,21,34,55,89, d. 1,1,1,1,1,1,1,1,1,1,
9. 8. Which PHP functions may be used to find out which PHP extensions are available in the system? (Choose 2) a. extension_loaded() b. get_extension_funcs() c. get_loaded_extensions() d. phpinfo()
10. 9. What is the name of the error level constant that is used to designate PHP code that will not work in future versions? E_???????
11. Your PHP script is repeatedly parsing 50KB of data returned from a remote web service into browser- readable HTML. Users complain that the script takes a long time to run. 10. Wich of the following measures usually leads to the best results? (Choose 2) a. Install a bytecode cache b. Install an SSD drive on the server c. Cache the data returned by the web service locally d. Upgrade to the lastest version of PHP
12. 11. What the following code produce? <?php define('CONSTANT', 1); define('_CONSTANT', 0); define('EMPTY', ''); if (!empty(EMPTY)) { if (!((bool) _CONSTANT)) { print "One"; } } elseif (constant('CONSTANT')==1) { print "Two": } a. One b. Two c. Syntax error
13. 12. Which of the following functions reads the entire contents of a file? a. fgets() b. file_get_contents() c. fread() d. readfile() e. file()
14. Consider the following PHP script, which reads a file, line-by-line, from a text file. 13. Which function call should be inserted in place of the question marks in order for the script to function correctly? <?php $file = fopen("test", "r"); while(!feof($file)) { echo ????????????; } fclose($file); a. file_get_contents($file) b. file($file) c. read_file($file) d. fgets($file) e. fread($file)
15. 14. Which of the following function calls will cause a file pointer to be returned to the beginning of the file? a. reset() b. fseek(-1) c. fseek(0, SEEK_END) d. fseek(0, SEEK_SET) e. fseek(0, SEEK_CUR)
16. 15. How will the following script be displayed if called directly from a browser? <?php header ("Content-type: image/jpeg"); ?> <?php readfile ("image.jpg"); ?> a. As a JPEG image b. As a binary file for display within the browser c. As a binary file for download d. As a JPEG file for download e. As a broken image
17. 16. Which of the following is not a valid PHP file wrapper resource? a. \\server\path\filename b. http://www.example.com/index.php c. myfile.txt d. compress.zlib://myfile.txt e. They all are valid
18. 17. Which of the following are valid PHP stream transports? (Choose 2) a. http b. STDIO c. ftp d. STDOUT e. stream
19. 18. What does an opcode cache do? a. It compiles scripts into binary objects to make them run faster b. It replaces the Zend Engine to provide a faster interpreter c. It caches a script’s output to improve its performance d. It improves performance by caching the intermediate code produced by the parser e. It caches a script in memory, thus eliminating the need for reloading it from disk at every iteration
20. 19. Who can spell the name of the Scope Resolution Operator? _ _ _ M _ _ _ M _ _ _ _ _ _ _ _ _ _ M
21. www.afup.org French Association of PHP Users Join