what does the following function do when passed two integer values..., PHP Functions, PHP

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Question:What does the following function do, when passed two integer values for $p and $q?<?php
function magic($p, $q) {
  return ($q == 0)?$p:magic($q, $p % $q);
}
?>

A Loops infinitely 
B Switches the values of $p and $q 
C Determines if they are both even or odd 
D Determines the greatest common divisor between them 
E Calculates the modulus between the two

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Question:What does the following function do, when passed two integer values for $p and $q?<?php function magic($p, $q) { return ($q == 0)?$p:magic($q, $p % $q); } ?>

A Loops infinitely

B Switches the values of $p and $q

C Determines if they are both even or odd

D Determines the greatest common divisor between them

E Calculates the modulus between the two

D

Question:What does the following function do, when passed two integer values for $p and $q?
<?php function magic($p, $q) { return ($q == 0)?$p:magic($q, $p % $q); } ?>