首先，我是这个json的完全新手，我已经寻找解决方案，但似乎我没有找到诀窍。
数据如下所示：
Array
(
[0] => Array
(
[debtor_name] => Name 1
[debtor_number] => 0001
[statement_date] => 7/31/17
[statement_period] => 07/01/2017 - 07/31/2017
[due_date] => 8/31/17
[statement_number] => 2017-07-0001
[courier] => Handcarry
[outstanding_bal] => 3,647.53
[bal_br_fwd] => 3,647.16
[age_cur] => 3,647.53
[age_30] => 0
[age_60] => 0
[age_90] => 0
[age_120] => 0
[password] => 11291934
[email] => rolex@bngtransmedia.com
[counter] => 1
[transList] => Array
(
[0] => Array
(
[lineOrder] => 0
[date] => 7/1/17
[dateNum] => 1498838400000
[ref] => 0000484236
[amt] => 7231.16
[desc] => MD-MONTHLY DUES
[debit] => 3584
[credit] => 0
)
[1] => Array
(
[lineOrder] => 1
[date] => 7/15/17
[dateNum] => 1500048000000
[ref] => 0000165008
[amt] => 3684
[desc] => CM-METROBANK
[debit] => 0
[credit] => 3647.16
)
[2] => Array
(
[lineOrder] => 2
[date] => 7/15/17
[dateNum] => 1500048000000
[ref] => 0000165008
[amt] => 3647.53
[desc] => 1% Discount
[debit] => 0
[credit] => 36.47
)
[3] => Array
(
[lineOrder] => 3
[date] => 7/1/17
[dateNum] => 1498838400000
[ref] => 0000484237
[amt] => 7331.16
[desc] => MD-VALLEY SENIORS FEE
[debit] => 100
[credit] => 0
)
)
)
[1] => Array
(
[debtor_name] => Name 2
[debtor_number] => 2665
[statement_date] => 7/31/17
[statement_period] => 07/01/2017 - 07/31/2017
[due_date] => 8/31/17
[statement_number] => 2017-07-2665
[courier] => Sure Mail
[outstanding_bal] => 18,194.93
[bal_br_fwd] => 17,897.63
[age_cur] => 5,193.00
[age_30] => 6,196.01
[age_60] => 4,984.71
[age_90] => 1,821.21
[age_120] => 0
[password] => 05291962
[email] => r.estemonio@gmail.com
[counter] => 5372
[transList] => Array
(
[0] => Array
(
[lineOrder] => 4
[date] => 7/1/17
[dateNum] => 1498838400000
[ref] => 0000479082
[amt] => 18082.63
[desc] => F&B CONCESSIONAIRE-F&B 015904 JJ
[debit] => 185
[credit] => 0
)
[1] => Array
(
[lineOrder] => 5
[date] => 7/1/17
[dateNum] => 1498838400000
[ref] => 0000485742
[amt] => 21666.63
[desc] => MD-MONTHLY DUES
[debit] => 3584
[credit] => 0
)
[2] => Array
(
[lineOrder] => 6
[date] => 7/1/17
[dateNum] => 1498838400000
[ref] => 0000485743
[amt] => 21890.63
[desc] => MD-LOCKER RENTAL
[debit] => 224
[credit] => 0
)
[3] => Array
(
[lineOrder] => 7
[date] => 7/1/17
[dateNum] => 1498838400000
[ref] => 0000481000
[amt] => 21920.63
[desc] => F&B CONCESSIONAIRE-F&B 026492 ANIX
[debit] => 30
[credit] => 0
)
[4] => Array
(
[lineOrder] => 8
[date] => 7/31/17
[dateNum] => 1501430400000
[ref] => PF00072305
[amt] => 18194.93
[desc] => PATRONAGE FEE
[debit] => 0
[credit] => 448
)
[5] => Array
(
[lineOrder] => 9
[date] => 7/6/17
[dateNum] => 1499270400000
[ref] => 0000481002
[amt] => 22010.63
[desc] => F&B CONCESSIONAIRE-F&B 027375 ANIX
[debit] => 15
[credit] => 0
)
[6] => Array
(
[lineOrder] => 10
[date] => 7/8/17
[dateNum] => 1499443200000
[ref] => 0000479083
[amt] => 22268.63
[desc] => F&B CONCESSIONAIRE-F&B 016332 JJ
[debit] => 258
[credit] => 0
)
[7] => Array
(
[lineOrder] => 11
[date] => 7/8/17
[dateNum] => 1499443200000
[ref] => 0000164358
[amt] => 17372.93
[desc] => CM-METROBANK
[debit] => 0
[credit] => 4895.7
)
[8] => Array
(
[lineOrder] => 12
[date] => 7/15/17
[dateNum] => 1500048000000
[ref] => 0000481003
[amt] => 17422.93
[desc] => F&B CONCESSIONAIRE-F&B 028985 ANIX
[debit] => 50
[credit] => 0
)
[9] => Array
(
[lineOrder] => 13
[date] => 7/15/17
[dateNum] => 1500048000000
[ref] => 0000479084
[amt] => 17735.93
[desc] => F&B CONCESSIONAIRE-F&B 016716 JJ
[debit] => 313
[credit] => 0
)
[10] => Array
(
[lineOrder] => 14
[date] => 7/22/17
[dateNum] => 1500652800000
[ref] => 0000478834
[amt] => 18289.93
[desc] => F&B CONCESSIONAIRE-08528DR
[debit] => 554
[credit] => 0
)
[11] => Array
(
[lineOrder] => 15
[date] => 7/29/17
[dateNum] => 1501257600000
[ref] => 0000479085
[amt] => 18642.93
[desc] => F&B CONCESSIONAIRE-F&B 017434 JJ
[debit] => 353
[credit] => 0
)
[12] => Array
(
[lineOrder] => 16
[date] => 7/1/17
[dateNum] => 1498838400000
[ref] => 0000481001
[amt] => 21995.63
[desc] => F&B CONCESSIONAIRE-F&B 026713 ANIX
[debit] => 75
[credit] => 0
)
)
)
)
所以我得到这样的数据
$json = json_decode($_POST["list"], true);
我尝试了这行代码，但似乎无法正常工作：
function sort_by_date($a, $b) {
$a = strtotime($a['date']);
$b = strtotime($b['date']);
return ($a < $b) ? -1 : 1;
}
usort($json, 'sort_by_date');
我试图按照日期在transList数组中对这个JSON数组进行排序，但我真的不知道我应该如何在数组上调用这个变量，非常感谢正确方向的任何提示！
答案 0 :(得分：1)
这会对每个transList中的数组进行排序：
foreach( $json as $k => $v )
{
usort( $v['transList'], function( $a, $b ){
$d1 = new DateTime( $a['date'] );
$d2 = new DateTime( $b['date'] );
if( $d1 == $d2 ){
return 0;
}
return ($d1 < $d2) ? -1 : 1;
});
// For testing purposes, the array is print to screen to show sorting worked as required
echo '<pre>';
print_r( $v['transList'] );
echo '</pre>';
}
仅出于测试目的，我使用以下数据来模拟您的数据：
$json = [
[
'transList' => [
[
'id' => 'a',
'date' => '7/15/17'
],
[
'id' => 'b',
'date' => '2/15/17'
],
[
'id' => 'c',
'date' => '7/15/16'
],
[
'id' => 'd',
'date' => '4/15/12'
],
[
'id' => 'e',
'date' => '3/15/16'
]
]
],
[
'transList' => [
[
'id' => 'd',
'date' => '7/15/17'
],
[
'id' => 'b',
'date' => '2/15/17'
],
[
'id' => 'g',
'date' => '7/15/16'
],
[
'id' => 'a',
'date' => '4/15/12'
],
[
'id' => 'x',
'date' => '3/15/16'
]
]
]
];
如果日期相同，请回答有关按金额进一步分类的问题：
foreach( $json as $k => $v )
{
usort( $v['transList'], function( $a, $b ){
$d1 = new DateTime( $a['date'] );
$d2 = new DateTime( $b['date'] );
if( $d1 == $d2 ){
if( $a['amt'] == $b['amt'] ){
return 0;
}
return ($a['amt'] < $b['amt']) ? -1 : 1;
}
return ($d1 < $d2) ? -1 : 1;
});
// For testing purposes, the array is print to screen to show sorting worked as required
echo '<pre>';
print_r( $v['transList'] );
echo '</pre>';
}