对多个数组或多维数组进行排序

#关于array_multisort 可以用来一次对多个数组进行排序，或者根据某一维或多维对多维数组进行排序。

bool array_multisort ( array &$array1 [, mixed $array1_sort_order = SORT_ASC [, mixed $array1_sort_flags = SORT_REGULAR [, mixed $... ]]] )

我们先来看一段案例:

$data=[
    ['card'=>"中信银行",'id'=>"1481",'day'=>'9','repay'=>'29','limit'=>"40000"],
    ['card'=>"民生银行",'id'=>"1481",'day'=>'17','repay'=>'19','limit'=>"50000"],
    ['card'=>"交通银行",'id'=>"1441",'day'=>'18','repay'=>'25','limit'=>"60000"],
    ['card'=>"招商银行",'id'=>"1481",'day'=>'5', 'repay'=>'9','limit'=>"70000"]
];

现在我们需要按还款日最近的前面进行排序

$sort= array_map(create_function('$n', 'return $n["repay"];'), $data);
array_multisort($sort,SORT_DESC,$data );

array(4) {
  [0]=>
  array(5) {
    ["card"]=>
    string(12) "中信银行"
    ["id"]=>
    string(4) "1481"
    ["day"]=>
    string(1) "9"
    ["repay"]=>
    string(2) "29"
    ["limit"]=>
    string(5) "40000"
  }
  [1]=>
  array(5) {
    ["card"]=>
    string(12) "交通银行"
    ["id"]=>
    string(4) "1441"
    ["day"]=>
    string(2) "18"
    ["repay"]=>
    string(2) "25"
    ["limit"]=>
    string(5) "60000"
  }
  [2]=>
  array(5) {
    ["card"]=>
    string(12) "民生银行"
    ["id"]=>
    string(4) "1481"
    ["day"]=>
    string(2) "17"
    ["repay"]=>
    string(2) "19"
    ["limit"]=>
    string(5) "50000"
  }
  [3]=>
  array(5) {
    ["card"]=>
    string(12) "招商银行"
    ["id"]=>
    string(4) "1481"
    ["day"]=>
    string(1) "5"
    ["repay"]=>
    string(1) "9"
    ["limit"]=>
    string(5) "70000"
  }
}

参考http://php.net/manual/zh/function.array-multisort.php