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200-550 – 200-550

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Showing 13–15 of 15 questions

Question 13

What is the recommended method of copying data between two opened files?

Select an option, then click Submit answer.

  • ○

    copy($source_file, $destination_file);
  • ○

    copy($destination_file, $source_file);
  • ○

    stream_copy_to_stream($source_file, $destination_file);
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    stream_copy_to_stream($destination_file, $source_file);
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    stream_bucket_prepend($source_file, $destination_file);
Question 14

What is the output of the following code? class A { public $a = 1;

public function __construct($a) { $this->a = $a; }

public function mul() { return function($x) {

return $this->a*$x;

};

}

}

$a = new A(2); $a->mul = function($x) {

return $x*$x;

};

$m = $a->mul(); echo $m(3);

Select an option, then click Submit answer.

  • ○

    9
  • ○

    6
  • ○

    0
  • ○

    3
Question 15

After performing the following operations:

$a = array('a', 'b', 'c');

$a = array_keys(array_flip($a));

What will be the value of $a?

Select an option, then click Submit answer.

  • ○

    array('c', 'b', 'a')
  • ○

    array(2, 1, 0)
  • ○

    array('a', 'b', 'c')
  • ○

    None of the above