consider the following script php function myfunction a b true if..., PHP Basics, Zend Certification

Question:Consider the following script:<?php
function myfunction($a, $b = true)
{
  if($a && !$b) {
    echo "Hello, World!\n";
  }
}
$s = array(0 => "my",
1 => "call",
2 => '$function',
3 => ' ',
4 => "function",
5 => '$a',
6 => '$b',
7 => 'a',
8 => 'b',
9 => '');
$a = true;
$b = false;
/* Group A */
$name = $s[?].$s[?].$s[?].$s[?].$s[?].$s[?];
/* Group B */
$name(${$s[?]}, ${$s[?]});
?>
Each ? in the above script represents an integer index against the $s array. In order to display the Hello, World! string when executed, what must the missing integer indexes be?

A Group A: 4,3,0,4,9,9 Group B: 7,8 
B Group A: 1,3,0,4,9,9 Group B: 7,6 
C Group A: 1,3,2,3,0,4 Group B: 5,8 
D Group A: 0,4,9,9,9,9 Group B: 7,8 
E Group A: 4,3,0,4,9,9 Group B: 7,8

/32

+ AnswerD

+ ExplanationFunctions can be called dynamically by appending parentheses (as well as any parameter needed) to a variable containing the name of the function to call. Thus, for Group A the appropriate index combination is 0, 4, 9, 9, 9, 9, which evaluates to the string myfunction. The parameters, on the other hand, are evaluated as variables dynamically using the ${} construct. This means the appropriate indexes for group B are 7 and 8, which evaluate to ${'a'} and ${'b'}—meaning the variables $a and $b respectively. Therefore, the correct answer is D.

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