我的数组为每个字段(例如,日期,名称等)都有一个数组。如何按日期对数组排序?我应该创建另一个数组吗?我可以在这里使用排序还是不排序。如果是,怎么办?这是我的数组:
Array
(
[date] => Array
(
[0] => 03/11/2019
[1] => 03/19/2019
[2] => 03/15/2019
[3] => 12/15/2018
)
[name] => Array
(
[0] => Lowa
[1] => Stephanie
[2] => Allan
[3] => Joffer
)
[number] => Array
(
[0] => 178989898
[1] => 111111111
[2] => 222222222
[3] => 333333333
)
[unit] => Array
(
[0] => HR
[1] => VPP
[2] =>
[3] => OAT
)
[department] => Array
(
[0] => Chemistry
[1] => IT
[2] => Lab
[3] => Contractor
)
)
最后,我的第一个元素是:
03/19/2019 Stephanie 111111111 VPP IT
答案 0 :(得分:1)
首先保存数组的键-然后使用array_value
转换为整数键,以便可以使用...
运算符。
然后,您可以将array_filter
与null
函数一起使用来重新组织数组。下一步将使用array_map
和array_combine
找回密钥。
最后一步-用usort
按“数据”排序
考虑以下示例:
$arr = ["date" => ["3", "7", "5"], "name" => ["aa", "bb", "cc"]]; // this can have a lot more sub-array inside
$keys = array_keys($arr); // extract the keys for later use
$res = array_map(null, ...array_values($arr)); // transposed the array
$res = array_map(function ($e) use ($keys) {return array_combine($keys, $e);}, $res); // return the keys to the transposed array
usort($res, function ($a, $b) {return strcmp($a['date'], $b['date']);} ); // sort all by "date"
参考:
array-keys,array-filter,array-map,usort,array-values
通知 @MarcoS发表有关比较日期的评论
答案 1 :(得分:1)
我认为您的数据可以得到更好的组织:
$newArr = Array
(
[0] => Array
(
[date] => 03/11/2019
[name] => Lowa
[number] => 178989898
[unit] => HR
[department] => Chemistry
)
[1] => Array
(
[date] => 03/19/2019
[name] => Stephanie
[number] => 111111111
[unit] => VPP
[department] => IT
)
[2] => Array
(
[date] => 03/15/2019
[name] => Allan
[number] => 222222222
[unit] =>
[department] => Lab
)
[3] => Array
(
[date] => 12/15/2018
[name] => Joffer
[number] => 333333333
[unit] => OAT
[department] => Contractor
)
);
然后,您可以简单地按以下顺序对其进行排序:
function cmp($a, $b) {
if ($a["date"] == $b["date"]) return 0;
return ($a["date"] < $b["date"]) ? -1 : 1;
}
usort($newArr, "cmp");
请注意,日期格式为“月/日/年”,不能按字母顺序排序。
您绝对应该为日期使用年/月/日格式,或者编写更具体的cmp()
函数...
更新:要在评论中回答OP的问题:只需颠倒$ row和“ field”顺序:
for ($row = 0; $row < count($date); $row++) {
$newArr[$row]['date'] = $date[$row];
$newArr[$row]['name'] = $name[$row];
...
}