National_Instruments
200-500 · Question #219
200-500 Question #219: Real Exam Question with Answer & Explanation
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Question
What is the output of the following script? 1 <?php 2 class a 3 { 4 public $val; 5 } 7 function renderVal (a $a) 8 { 9 if ($a) { 10 echo $a->val; 11 } 12 } 14 renderVal (null); 15 ?>
Options
- AA syntax error in the function declaration line
- BAn error, because null is not an instance of 'a'
- CNothing, because a null value is being passed to renderVal()
- DNULL
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