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
)
)
我想按 $myArray[1] 排序。我有这个 usort 函数:
function sortAmount($a, $b) {
return strnatcmp($a[1], $b[1]);
}
它的名字是这样的:
usort($myArray, "sortAmount");
但是,调用usort后数组并没有改变。我希望 $myArray[1] 中的数字按升序排序,并让 $myArray[0] 和 $myArray[2] 中相应的索引随之改变。
array_multisort
:
array_multisort($a[1], $a[0], $a[2]);
给予
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,为什么要用
strcmp
来比较数字?