Example of filtering odd and even numbers in php array

function pick_one_side($arr, $need_odd){
 return array_filter($arr, function($item) use($need_odd){
  return $need_odd ? ($item & 1) : (!($item & 1));
 });
}
//数据筛选调用
$one_side = pick_one_side(range(1, 100), false);
print_r($one_side);