奇偶筛选，关于php的品格

<?php
function pick_one_side($arr, $need_odd){
	return array_filter($arr, function($item) use($need_odd){
		return $need_odd ? ($item & 1) : (!($item & 1));
	});
}

$one_side = pick_one_side(range(1, 100), false);
print_r($one_side);