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x
 
<!DOCTYPE html>
<html>
<body>
<?php
function sumMyNumbers(...$x) {
  $n = 0;
  $len = count($x);
  for($i = 0; $i < $len; $i++) {
    $n += $x[$i];
  }
  return $n;
}
$a = sumMyNumbers(5, 2, 6, 2, 7, 7);
echo $a;
?>
</body>
</html>
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