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swap
  1. <?php
  2. function swap($a, $b)
  3. {
  4.         $a = 2;
  5.         $b = -3;
  6.         $a+=+$b-$b=$a;
  7.         echo('$a = ' . $a . "n");
  8.         echo('$b = ' . $b . "n");
  9. }
  10. echo swap(2, -3);
  11.  
  12.  
  13. ?>
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