function closestToZero(array $ints) {
  
  if(empty($ints))
    return 0;
  
  $closest = $ints[0];
  $init = abs($ints[0]) - 1;
  
  foreach($ints as $n){
    if( abs($n) - 1 <= $init )
    {
        $closest = $n;
        $init = abs($n) - 1;
    }
  }

  return $closest;
}