[英]Sorting a Multidimensional Array in PHP
我的數組看起來像這樣:
Array
(
[0] => Array
(
[0] => 1
[1] => 6
[2] => 4
[3] => 5
)
[1] => Array
(
[0] => 272.05
[1] => 63.54
[2] => 544.79
[3] => 190.62
)
[2] => Array
(
[0] => 2011-03-06 14:08:19
[1] => 2011-03-06 14:29:04
[2] => 2011-03-06 14:28:39
[3] => 2011-03-06 14:29:28
)
)
我想按$ myArray排序[1]。 我有這個usort功能:
function sortAmount($a, $b) {
return strnatcmp($a[1], $b[1]);
}
它被稱為這樣:
usort($myArray, "sortAmount");
但是,調用usort后,數組不會更改。 我希望$ myArray [1]中的數字按升序排序,並且$ myArray [0]和$ myArray [2]中的相應索引隨之改變。
我想你想要array_multisort
:
array_multisort($a[1], $a[0], $a[2]);
給
Array
(
[0] => Array
(
[0] => 6
[1] => 5
[2] => 1
[3] => 4
)
[1] => Array
(
[0] => 63.54
[1] => 190.62
[2] => 272.05
[3] => 544.79
)
[2] => Array
(
[0] => 2011-03-06 14:29:04
[1] => 2011-03-06 14:29:28
[2] => 2011-03-06 14:08:19
[3] => 2011-03-06 14:28:39
)
)
除此之外,你為什么要使用strcmp
來比較數字呢?
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