[英]Sum of same id in Array of object using php
我想從兩個對象數組中添加 given_points 並在 student_id 的幫助下顯示在單個對象數組中 bcoz 在兩個對象數組 student_id 中都是唯一的。
Array
(
[0] => stdClass Object
(
[student_id] => 91
[given_points] => 8
[bonus_points] => 2
)
[1] => stdClass Object
(
[student_id] => 91
[given_points] => 6
[bonus_points] => 1
)
)
Array
(
[0] => stdClass Object
(
[student_id] => 95
[given_points] => 9
[bonus_points] => 1
)
[1] => stdClass Object
(
[student_id] => 95
[given_points] => 9
[bonus_points] => 1
)
)
$sum = 0;
foreach($array as $key => $value)
{
sum+=$array[$key]['given_points'];
}
echo $sum //prints sum
$sum_points = 0;
$sum_student_id=0;
foreach($array as $key=>$value){
if(isset($value->given_points))
$sum_points += $value->given_points;
if(isset($value->student_id))
$sum_student_id += $value->student_id;
}
echo $sum_points;
echo $sum_student_id;
由於這是一個 stdClass 數組,請使用->代替方括號['']
還有另一種方式: (PHP >= 5.5)
$sum_points = array_sum(array_column($array, 'given_points'));
$sum_student_ids = array_sum(array_column($array, 'student_id'));
$array = [
0 => ['student_id' => 91,
'given_points' => 8,
'bonus_points' => 2
],
1 => ['student_id' => 91,
'given_points' => 8,
'bonus_points' => 2
],
2 => ['student_id' => 92,
'given_points' => 8,
'bonus_points' => 2
],
3 => ['student_id' => 93,
'given_points' => 8,
'bonus_points' => 2
]
];
foreach ($array as $row) {
if (isset($newArray[$row['student_id']])) {
$newArray[$row['student_id']] = $newArray[$row['student_id']] + $row['given_points'];
} else {
$newArray[$row['student_id']] = $row['given_points'];
}
}
print_r($newArray);
您可以嘗試類似上面的代碼。 基本上,因為 student_id 是表的唯一標識符,並且您希望基於此實現邏輯,然后將其設為新的數組鍵字段。
上面的代碼將處理盡可能多的記錄,輸出的數組將如下所示:
Array
(
[91] => 16
[92] => 8
[93] => 8
)
添加了 2 個 id 為 91 的用戶,其余是單獨數組字段中的唯一用戶。
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