1.根据当前时间计算N天后的时间
$info = (new DateTime($nowDate))->add(new DateInterval("P{$days}D"))->format('Y-m-d’);
2.根据一个指定的时间获取改天是周几
$weekarray=array("日","一","二","三","四","五","六");
echo "星期".$weekarray[date("w","2015-11-26")];
3.二维数组排序
$data = array();
$data[] = array('volume' => 67, 'edition' => 2);
$data[] = array('volume' => 86, 'edition' => 1);
$data[] = array('volume' => 85, 'edition' => 6);
$data[] = array('volume' => 98, 'edition' => 2);
$data[] = array('volume' => 86, 'edition' => 6);
$data[] = array('volume' => 67, 'edition' => 7);
// 取得列的列表
foreach ($data as $key => $row)
{
$volume[$key] = $row['volume'];
$edition[$key] = $row['edition'];
}
array_multisort($volume, SORT_DESC, $edition, SORT_ASC, $data);
4.数组去重去空
$newData = array_unique(array_filter($oldData));
网页标题：工作中用到的PHP函数
标题网址：
http://bjjierui.cn/article/jeoidg.html
