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//Найти второе по величине значение
$numbers = [3, 2, 1, 4, 7, 2, 9, 5, 9];
$max = max($numbers);
$rsort = rsort($numbers);
$current = current ($numbers);

foreach($numbers as $num){
  if($current === $num ){
    continue;
  }
  else{
    print_r($num);
    break;
  }
}