[英]Sorting similar result in usort in PHP
我知道這段代碼將按最晚開始時間對活動數組進行排序,並且還僅顯示循環中第一個具有相同日期的活動。
foreach ($activity_array AS $k => $v):
......
usort($v['activity'], function ($a, $b) {
$ad = new DateTime($a['start']);
$bd = new DateTime($b['start']);
if ($ad == $bd) {
return 0;
}
return $ad < $bd ? -1 : 1;
});
如果開始時間相同,但又如何在同一活動中進行排序,該如何對它進行排序呢?
| Activity | Start | Venue |
+------------+----------------+-----------+
| Activity A | 22/10/17 08.30 | Floor 1 |
| Activity D | 22/10/17 10.30 | Hall 3 |
| Activity B | 22/10/17 10.30 | Hall 1 |
| Activity C | 22/10/17 10.30 | Hall 2 |
| Activity X | 22/10/17 09.30 | Floor 2 |
像是:
| Activity | Start | Venue |
+------------+----------------+-----------+
| Activity A | 22/10/17 08.30 | Floor 1 |
| Activity X | 22/10/17 09.30 | Floor 2 |
| Activity B | 22/10/17 10.30 | Hall 1 |
| Activity C | 22/10/17 10.30 | Hall 2 |
| Activity D | 22/10/17 10.30 | Hall 3 |
您可以在開始時間相同時再次檢查場地
foreach ($activity_array AS $k => $v):
......
usort($v['activity'], function ($a, $b) {
$ad = new DateTime($a['start']);
$bd = new DateTime($b['start']);
if ($ad == $bd) {
$venue1 = $a['venue'];
$venue2 = $b['venue'];
return strcmp($venue1, $venue2);
}
return $ad < $bd ? -1 : 1;
});
這是您的解決方案。
$array = array(
array('activity' => 'Activity A', 'start' => '22/10/17 08.30', 'venue' => 'Floor 1'),
array('activity' => 'Activity D', 'start' => '22/10/17 10.30', 'venue' => 'Hall 3'),
array('activity' => 'Activity B', 'start' => '22/10/17 10.30', 'venue' => 'Hall 1'),
array('activity' => 'Activity C', 'start' => '22/10/17 10.30', 'venue' => 'Hall 2'),
array('activity' => 'Activity X', 'start' => '22/10/17 09.30', 'venue' => 'Floor 2')
); //Your Array
usort($array,"cmp");
function cmp($a, $b){
if ($a["venue"] == $b["venue"]) {
return 0;
}
return ($a["venue"] < $b["venue"]) ? -1 : 1;
}
結果
Array
(
[0] => Array
(
[activity] => Activity A
[start] => 22/10/17 08.30
[venue] => Floor 1
)
[1] => Array
(
[activity] => Activity X
[start] => 22/10/17 09.30
[venue] => Floor 2
)
[2] => Array
(
[activity] => Activity B
[start] => 22/10/17 10.30
[venue] => Hall 1
)
[3] => Array
(
[activity] => Activity C
[start] => 22/10/17 10.30
[venue] => Hall 2
)
[4] => Array
(
[activity] => Activity D
[start] => 22/10/17 10.30
[venue] => Hall 3
)
)
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