Question

这是我的多重排序代码。

但是，我如何为个别颜色做这件事

到目前为止，我所做的是

PHP代码：

<?php
$a1=array("Cat","Alpha","two");
$a1=array("Cat","Beta","two");
$a1=array("Pluto","Beta","two");
$a1=array("Pluto","Alpha","two");
array_multisort($a1[0], SORT_ASC, SORT_STRING, $a1[1], SORT_NUMERIC, SORT_DESC);
$json[] = $a1;
$final=array("response"=>$a1);
echo json_encode($final);
?>

它将显示为

Array ( [0] => Cat [1] => Dog [2] => zb ) Array ( [0] => Missy [1] => Pluto [2] => Fido )

但是，我想显示

作为Asc的$ a1的第一个coloumn，然后作为Desc的$ a1的第二个coloumn，

所以结果应该是

Col A  Col B, Col C
Cat,   Alpha  two
Cat,   Beta   two
Pluto, Alpha  two
Plugo, Beta   two

我该怎么做？

Answer 1

我想您想使用usort来构建自己的自定义排序算法：

<?php
$array = array(
    array("Cat","Alpha","two"),
    array("Cat","Beta","two"),
    array("Pluto","Beta","two"),
    array("Pluto","Alpha","two"),
);

function my_custom_sort($a, $b)
{
    // first sort ASC by first column
    if ($a[0] == $b[0]) {
        // then sort ASC by second column
        if ($a[1] == $b[1]) {
            return 0;
        } else {
            return $a[1] < $b[1] ? -1 : 1;
        }
    } else {
        return $a[0] < $b[0] ? -1 : 1;
    }
}

usort($array, 'my_custom_sort');
var_dump($array);

Answer 2

<?php
$a1=array("Dog","zb","Cat");
$a2=array("Pluto","Fido","Missy");

array_multisort($a1,SORT_ASC);
array_multisort($a2,SORT_DESC);
print_r($a1);
print_r($a2);
?>

Array中的MultiSort

2 个答案: