[英]Sorting a Multidimensional Array in PHP
My array looks like this: 我的数组看起来像这样:
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
)
)
I want to sort by $myArray[1]. 我想按$ myArray排序[1]。 I have this usort function:
我有这个usort功能:
function sortAmount($a, $b) {
return strnatcmp($a[1], $b[1]);
}
It is called like this: 它被称为这样:
usort($myArray, "sortAmount");
However, the array does not change after calling usort. 但是,调用usort后,数组不会更改。 I want the numbers in $myArray[1] to be sorted in ascending order, and for the corresponding indexes in $myArray[0] and $myArray[2] to change with it.
我希望$ myArray [1]中的数字按升序排序,并且$ myArray [0]和$ myArray [2]中的相应索引随之改变。
I think you want array_multisort
: 我想你想要
array_multisort
:
array_multisort($a[1], $a[0], $a[2]);
gives 给
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
)
)
Apart from that, why do you use strcmp
to compare numbers ? 除此之外,你为什么要使用
strcmp
来比较数字呢?
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