php 使用 array_multisort 对多维数组进行排序

sort a multidimensional array using array_multisort

提问by dst11

I have this array

我有这个数组

Array
(
    [0] => Array
        (
            [brand] => blah blah
            [location] => blah blah
            [address] => blah blah
            [city] => blah blah
            [state] => CA
            [zip] => 90210
            [country] => USA
            [phone] => 555-1212
            [long] => -111
            [lat] => 34
            [distance] => 3.08
        )
    [1] => Array
        (
            [brand] => blah blah
            [location] => blah blah
            [address] => blah blah
            [city] => blah blah
            [state] => CA
            [zip] => 90210
            [country] => USA
            [phone] => 555-1212
            [long] => -111
            [lat] => 34
            [distance] => 5
        )
.
.
.

}

I want to be able to sort the arrays in the hash by distance.

我希望能够按距离对散列中的数组进行排序。

回答by Jacob

You need to extract all the distances first, then pass both the distance and the data to the function. As shown in example 3 in the array_multisortdocumentation.

您需要先提取所有距离，然后将距离和数据都传递给函数。如array_multisort文档中的示例 3 所示。

foreach ($data as $key => $row) {
    $distance[$key] = $row['distance'];
}

array_multisort($distance, SORT_ASC, $data);

This assumes you want the shortest distances first, otherwise change the SORT_ASCto SORT_DESC

这假设您首先想要最短距离，否则将更SORT_ASC改为SORT_DESC

回答by Chirag Viradiya

If you want to avoid the looping you can use the array_columnfunction to achieve your target. For Example,

如果您想避免循环，您可以使用该array_column功能来实现您的目标。例如，

You want to sort below array with distance sort

您想使用距离排序在数组下方进行排序

$arr = array( 
  0 => array( 'lat' => 34, 'distance' => 332.08 ),
  1 => array( 'lat' => 34, 'distance' => 5 ),
  2 => array( 'lat' => 34, 'distance' => 34 )
);

Using below single line your array will be sort by distance

使用下面的单行，您的数组将按距离排序

array_multisort( array_column( $arr, 'distance' ), SORT_ASC, SORT_NUMERIC, $arr );

Now, $arrcontain with sortedarray by distance

现在，$arr包含按距离排序的数组

回答by Czechnology

Use can use usort;

使用可以使用usort；

function cmpDistance($a, $b) {
    return ($a['distance'] - $b['distance']);
}

usort($array, "cmpDistance");

回答by karthikeyan ganesan

This code helps to sort the multidimensional array using array_multisort()

此代码有助于使用array_multisort()对多维数组进行排序

  $param_dt = array();
  foreach ($data_set as $key => $row) {
     if(isset($row['params']['priority']))
     {
       $param_dt[$key] = $row['params']['priority'];
     }
     else
     {
        $param_dt[$key] = -2; // if priority key is not set for this array - it first out
     }
    }

  array_multisort($param_dt, SORT_ASC,SORT_NUMERIC, $data_set); 

Now $data_sethas the sorted list of elements.

现在$data_set有元素的排序列表。