PHP按项目数对多维数组进行排序 [英] PHP Sort a multidimensional array by number of items
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问题描述
我有一个数组，例如:
Array
(
[DEF] => Array
(
[0] => Array
(
[type] => 1
[id] => 1212
[name] => Jane Doe
[current] => 1
)
[1] => Array
(
[type] => 1
[id] => 3123121
[name] => Door
[current] =>
)
)
[ABC] => Array
(
[0] => Array
(
[type] => 1
[id] => 1234
[name] => John Doe
[current] =>
)
)
[WW] => Array
(
[0] => Array
(
[type] => 1
[id] => 1212
[name] => Jane Doe
[current] => 1
)
[1] => Array
(
[type] => 1
[id] => 3123121
[name] => Door
[current] =>
)
[2] => Array
(
[type] => 1
[id] => 64646
[name] => Floor
[current] =>
)
)
)
我想按数组内部项目的数量( count() )降序(即大多数项目在前)对这个数组进行排序，所以我将拥有这个数组:
And I want to sort this array by number ( count() ) of inner-array items descending (i.e. most items first), so I will have this array:
Array
(
[WW] => Array
(
[0] => Array
(
[type] => 1
[id] => 1212
[name] => Jane Doe
[current] => 1
)
[1] => Array
(
[type] => 1
[id] => 3123121
[name] => Door
[current] =>
)
[2] => Array
(
[type] => 1
[id] => 64646
[name] => Floor
[current] =>
)
)
[DEF] => Array
(
[0] => Array
(
[type] => 1
[id] => 1212
[name] => Jane Doe
[current] => 1
)
[1] => Array
(
[type] => 1
[id] => 3123121
[name] => Door
[current] =>
)
)
[ABC] => Array
(
[0] => Array
(
[type] => 1
[id] => 1234
[name] => John Doe
[current] =>
)
)
)
谁能提出一种有效的方法来做到这一点?谢谢.
Can anyone suggest an efficient way to do so? Thanks.
推荐答案
Using uksort:
Using uksort:
uksort($array, function($a, $b) { return count($b) - count($a); });
使用array_multisort:
array_multisort(array_map('count', $array), SORT_DESC, $array);
<小时>
使用 PHP <5.3:
With PHP < 5.3:
function sort_cb($a, $b) {
return count($b) - count($a);
}
uksort($array, 'sort_cb');
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