secondHighest.php

function secondHighest($numbers) 
{
  $higest = -1;
  $secondHighest = -1;
  foreach ($numbers as $number) {
     if ($higest < $number) {
        $higest = $number;
     }
  }
  
  foreach ($numbers as $number) {
     if ($number != $higest && $secondHighest < $number) {
        $secondHighest = $number;
     }
  }
  
  return $secondHighest;
}