get previous array values in foreach

Question

My array :

$arr = array(\"jan\",\"feb\",\"mar\",\"apr\",\"mei\",\"jun\",\"jul\",\"agu\",\"sep\",\"okt\",\"nov\",\"des\");

then i do a foreach<

Answer 1

$previousValue = null;
foreach($arr as $ar){
  echo $ar;
  if($previousValue) {
    echo $previousValue;
  }
  $previousValue = $ar;
}