Zend Zend Certifications 200-550 Questions & Answers

• Question 191:

  What is the output of the following code?

  class Test {

  public function __call($name, $args)

  {

  call_user_func_array(array('static', "test$name"), $args); }

  public function testS($l) {

  echo "$l,";

  }

  }

  class Test2 extends Test {

  public function testS($l) {

  echo "$l,$l,";

  }

  }

  $test = new Test2();

  $test->S('A');

  A. A,

  B. A,A,

  C. A,A,A,

  D. PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback

  Correct Answer: B

• Question 192:

  What is the output of the following code?

  class Base {

  protected static function whoami() {

  echo "Base ";

  }

  public static function whoareyou() {

  static::whoami();

  }

  }

  class A extends Base {

  public static function test() {

  Base::whoareyou();

  self::whoareyou();

  parent::whoareyou();

  A. :whoareyou();static::whoareyou();}public static function whoami() {echo "A ";}}class B extends A {public static function whoami() {echo "B ";}}

  B. :test();

  C. B B B B B

  D. Base A Base A B

  E. Base B B A B

  F. Base B A A B

  Correct Answer: C

• Question 193:

  What is the output of the following code?

  class C {

  public $x = 1;

  function __construct() { ++$this->x; }

  function __invoke() { return ++$this->x; }

  function __toString() { return (string) --$this->x; } }

  $obj = new C();

  echo $obj();

  A. 0

  B. 1

  C. 2

  D. 3

  Correct Answer: D

• Question 194:

  In order to create an object storage where each object would be stored only once, you may use which of the following? (Choose 2)

  A. SplFixedArray

  B. SplObjectStorage

  C. SplString

  D. spl_object_hash

  E. spl_same_object

  Correct Answer: BD

• Question 195:

  What is the output of the following code?

  function z($x) {

  return function ($y) use ($x) {

  return str_repeat($y, $x);

  };

  }

  $a = z(2);

  $b = z(3);

  echo $a(3) . $b(2);

  A. 22333

  B. 33222

  C. 33322

  D. 222333

  Correct Answer: B

• Question 196:

  What is the output of the following code?

  $f = function () { return "hello"; };

  echo gettype($f);

  A. hello

  B. string

  C. object

  D. function

  Correct Answer: C

• Question 197:

  Which line of code can be used to replace the INSERT comment in order to output "hello"? class C {

  public $ello = 'ello';

  public $c;

  public $m;

  function __construct($y) {

  $this->c = static function($f) {

  // INSERT LINE OF CODE HERE

  };

  $this->m = function() {

  return "h";

  };

  }

  }

  $x = new C("h");

  $f = $x->c;

  echo $f($x->m);

  A. return $this->m() . "ello";

  B. return $f() . "ello";

  C. return "h". $this->ello;

  D. return $y . "ello";

  Correct Answer: B

• Question 198:

  Consider the following two files. When you run test.php, what would the output look like?

  test.php:

  include "MyString.php";

  print ",";

  print strlen("Hello world!");

  MyString.php:

  namespace MyFramework\String;

  function strlen($str)

  {

  return \strlen($str)*2; // return double the string length }

  print strlen("Hello world!")

  A. 12,12

  B. 12,24

  C. 24,12

  D. 24,24

  E. PHP Fatal error: Cannot redeclare strlen()

  Correct Answer: C

• Question 199:

  Which of the following methods are available to limit the amount of resources available to PHP through php.ini? (Choose 2)

  A. Limit the amount of memory a script can consume

  B. Limit the total amount of memory PHP uses on the entire server

  C. Limit the maximum execution time of a script

  D. Limit the maximum number of concurrent PHP processes

  E. Limit the maximum number of concurrent PHP threads

  Correct Answer: AC

• Question 200:

  How should you track errors on your production website?

  A. Enabling display_errors

  B. Enabling log_errors

  C. Having a site-wide exception handler

  D. Setting error_reporting to E_ALL and ~E_NOTICE

  Correct Answer: B