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<!DOCTYPE html>
<html>
<body>
<?php
$a = 13;
if ($a > 10) {
  echo "Above 10";
  if ($a > 20) {
    echo " and also above 20";
  } else {
    echo " but not above 20";
  }
}
?>
</body>
</html>
Above 10 but not above 20