按值排序多维数组

How can I sort this array by the value of the "order" key? Even though the values are currently sequential, they will not always be.

如何根据“order”键的值对这个数组进行排序?尽管这些值目前是连续的，但它们并不总是连续的。

Array
(
    [0] => Array
        (
            [hashtag] => a7e87329b5eab8578f4f1098a152d6f4
            [title] => Flower
            [order] => 3
        )

    [1] => Array
        (
            [hashtag] => b24ce0cd392a5b0b8dedc66c25213594
            [title] => Free
            [order] => 2
        )

    [2] => Array
        (
            [hashtag] => e7d31fc0602fb2ede144d18cdffd816b
            [title] => Ready
            [order] => 1
        )
)

7 个解决方案

#1

1360

Try a usort: If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

尝试使用usort:如果你还在使用PHP 5.2或更早的版本，你必须先定义一个排序函数:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

从PHP 5.3开始，您可以使用匿名函数:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the "spaceship operator":

最后，使用PHP 7，您可以使用“太空船操作员”:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

若要将其扩展到多维排序，请参考第二个/第三个排序元素(如果第一个元素为零)——最好解释如下。你也可以用这个来分类子元素。

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

如果需要保留键关联，请使用uasort()—请参阅手册中数组排序函数的比较

#2

265

function aasort (&$array, $key) {
    $sorter=array();
    $ret=array();
    reset($array);
    foreach ($array as $ii => $va) {
        $sorter[$ii]=$va[$key];
    }
    asort($sorter);
    foreach ($sorter as $ii => $va) {
        $ret[$ii]=$array[$ii];
    }
    $array=$ret;
}

aasort($your_array,"order");

#3

242

I use this function :

我使用这个函数:

function array_sort_by_column(&$arr, $col, $dir = SORT_ASC) {
    $sort_col = array();
    foreach ($arr as $key=> $row) {
        $sort_col[$key] = $row[$col];
    }

    array_multisort($sort_col, $dir, $arr);
}


array_sort_by_column($array, 'order');

#4

I usually use usort, and pass my own comparison function. In this case, it is very simple:

我通常使用usort，通过我自己的比较函数。在这种情况下，很简单:

function compareOrder($a, $b)
{
  return $a['order'] - $b['order'];
}
usort($array, 'compareOrder');

#5

$sort = array();
$array_lowercase = array_map('strtolower', $array_to_be_sorted);
array_multisort($array_lowercase, SORT_ASC, SORT_STRING, $alphabetically_ordered_array);

This takes care of both upper and lower case alphabets.

这将同时处理大小写字母。

#6

To sort the array by the value of the "title" key use:

按“标题”键的值对数组进行排序:

uasort($myArray, function($a, $b) {
    return strcmp($a['title'], $b['title']);
});

strcmp compare the strings.

比较字符串的字符串进行比较。

uasort() maintains the array keys as they were defined.

uasort()按照定义维护数组键。

#7

Let's face it: php does NOT have a simple out of the box function to properly handle every array sort scenario.

让我们面对它:php并没有一个简单的盒子函数来正确处理每个数组排序场景。

This routine is intuitive, which means faster debugging and maintenance:

这个例程是直观的，意味着更快的调试和维护:

// automatic population of array
$tempArray = array();
$annotations = array();
// ... some code
// SQL $sql retrieves result array $result 
// $row[0] is the ID, but is populated out of order (comes from 
// multiple selects populating various dimensions for the same DATE 
// for example
while($row = mysql_fetch_array($result)) {
    $needle = $row[0];
    arrayIndexes($needle);  // create a parallel array with IDs only
    $annotations[$needle]['someDimension'] = $row[1]; // whatever
}
asort($tempArray);
foreach ($tempArray as $arrayKey) {
    $dataInOrder = $annotations[$arrayKey]['someDimension']; 
    // .... more code
}

function arrayIndexes ($needle) {
    global $tempArray;
    if (!in_array($needle,$tempArray)) {
        array_push($tempArray,$needle);
    }
}

#1