Zend Zend Certifications 200-550 Questions & Answers

• Question 51:

  An object can be counted with count() and sizeof() if it...

  A. implements ArrayAccess

  B. has a public __count() method

  C. was cast to an object from an array

  D. None of the above

  Correct Answer: D

• Question 52:

  What will be the result of the following operation? array_combine(array("A","B","C"), array(1,2,3));

  A. array("A","B","C",1,2,3)

  B. array(1,2,3,"A","B",C")

  C. array("A"=>1,"B"=>2,"C"=>3)

  D. array(1=>"A",2=>"B",3=>"C")

  E. array(1,2,3)

  Correct Answer: C

• Question 53:

  Which of the following expressions will evaluate to a random value from an array below? $array = array("Sue","Mary","John","Anna");

  A. array_rand($array);

  B. array_rand($array, 1);

  C. shuffle($array);

  D. $array[array_rand($array)];

  E. array_values($array, ARRAY_RANDOM);

  Correct Answer: D

• Question 54:

  Which is the most efficient way to determine if a key is present in an array, assuming the array has no NULL values?

  A. in_array('key', array_keys($a))

  B. isset($a['key'])

  C. array_key_exists('key', $a)

  D. None of the above

  Correct Answer: B

• Question 55:

  PHP's array functions such as array_values() can be used on an object if the object...

  A. implements Traversable

  B. is an instance of ArrayObject

  C. implements ArrayAccess

  D. None of the above

  Correct Answer: D

• Question 56:

  What is the output of the following code?

  for ($i = 0; $i < 1.02; $i += 0.17) {

  $a[$i] = $i;

  }

  echo count($a);

  A. 0

  B. 1

  C. 2

  D. 6

  E. 7

  Correct Answer: B

• Question 57:

  After performing the following operations:

  $a = array('a', 'b', 'c'); $a = array_keys(array_flip($a)); What will be the value of $a?

  A. array('c', 'b', 'a')

  B. array(2, 1, 0)

  C. array('a', 'b', 'c')

  D. None of the above

  Correct Answer: C

• Question 58:

  What DOM method is used to load HTML files?

  A. load()

  B. loadXML()

  C. loadHTML()

  D. loadHTMLFile()

  Correct Answer: D

• Question 59:

  What is the method used to execute XPath queries in the SimpleXML extension?

  A. xpathQuery()

  B. xpath()

  C. simpleXMLXpath()

  D. query()

  E. evaluate()

  Correct Answer: B

• Question 60:

  Which of the following statements are FALSE?

  A. SimpleXML allows removal of attributes.

  B. SimpleXML allows addition of new attributes.

  C. SimpleXML allows removal of nodes.

  D. SimpleXML allows addition of new nodes.

  E. None of the above

  Correct Answer: E