php - 如何在php中通过键值从数组对象获取数组项

Question

我有一个对象数组，如下所示:

$ARR =[
{"id":55,"timetable_id":1,"day":"Sat","checkin":"07:00:00","checkout":"11:00:00","isActive":1,"created_at":"2017-12-28 19:40:23","updated_at":"2017-12-28 19:40:23"},
{"id":54,"timetable_id":1,"day":"Fri","checkin":"07:00:00","checkout":"11:00:00","isActive":1,"created_at":"2017-12-28 19:40:23","updated_at":"2017-12-28 19:40:23"},
{"id":53,"timetable_id":1,"day":"Thu","checkin":"07:00:00","checkout":"11:00:00","isActive":1,"created_at":"2017-12-28 19:40:23","updated_at":"2017-12-28 19:40:23"},
{"id":52,"timetable_id":1,"day":"Wed","checkin":"07:00:00","checkout":"11:00:00","isActive":1,"created_at":"2017-12-28 19:40:23","updated_at":"2017-12-28 19:40:23"},
{"id":51,"timetable_id":1,"day":"Tue","checkin":"14:00:00","checkout":"17:00:00","isActive":1,"created_at":"2017-12-28 19:40:23","updated_at":"2017-12-28 19:40:23"},
{"id":50,"timetable_id":1,"day":"Tue","checkin":"07:00:00","checkout":"11:00:00","isActive":1,"created_at":"2017-12-28 19:40:23","updated_at":"2017-12-28 19:40:23"},
{"id":49,"timetable_id":1,"day":"Mon","checkin":"14:00:00","checkout":"16:00:00","isActive":1,"created_at":"2017-12-28 19:40:23","updated_at":"2017-12-28 19:40:23"},
{"id":48,"timetable_id":1,"day":"Mon","checkin":"07:00:00","checkout":"11:00:00","isActive":1,"created_at":"2017-12-28 19:40:23","updated_at":"2017-12-28 19:40:23"}
];

我想通过特定的键值获取任何数组项。例如，我想获取等于 Tue 的键 day 的项目，因此我的数组结果将如下所示:

$RESULTS=[
    {"id":51,"timetable_id":1,"day":"Tue","checkin":"14:00:00","checkout":"17:00:00","isActive":1,"created_at":"2017-12-28 19:40:23","updated_at":"2017-12-28 19:40:23"},
    {"id":50,"timetable_id":1,"day":"Tue","checkin":"07:00:00","checkout":"11:00:00","isActive":1,"created_at":"2017-12-28 19:40:23","updated_at":"2017-12-28 19:40:23"},
    ];

---

我尝试过的:

$RESULTS = [];
foreach($ARR as $item){
   if($item->day == 'Tue'){
     $RESULTS[] = $item;
   }
}

从技术上讲，它按预期工作，但需要编写很多行代码。还有其他PHP函数支持这个操作吗？我尝试了 array_slice 和 array_search 但没有运气。

Answer 1

您的实现绝对没有任何问题。我能想到的唯一其他选择是 array_filter

$RESULTS = array_filter($ARR, function($item) {
    return $item->day === 'Tue';
});

您最初的方法很可能是 more performant但比这个更重要，尤其是在这么小的数组中。

另请注意，键是用 array_filter 保留的，因此最终会得到索引 4 和 5。您可以使用 array_values 重新索引数组

$RESULTS = array_values($RESULTS);