我已经在从低到高的值距离上对多维数组进行了排序。这是输出的一个例子:(实际输出有大约20或30个数组)。
阵 (
[0] => Array
(
[id] => 1
[distance] => 5
[sponsor] => 0
)
[1] => Array
(
[id] => 20
[distance] => 8
[sponsor] => 1
)
[2] => Array
(
[id] => 25
[distance] => 10
[sponsor] => 0
)
[3] => Array
(
[id] => 78
[distance] => 25
[sponsor] => 1
)
)
在从低到高的距离排序之后,如果赞助商= 1,我想优先考虑。这是首选输出:
阵 (
[0] => Array
(
[id] => 20
[distance] => 8
[sponsor] => 1
)
[1] => Array
(
[id] => 78
[distance] => 25
[sponsor] => 1
)
[2] => Array
(
[id] => 1
[distance] => 5
[sponsor] => 0
)
[3] => Array
(
[id] => 25
[distance] => 10
[sponsor] => 0
)
)
赞助商是0或1.我如何解决这个问题?我想到的是,在排序距离之前,我应该根据赞助商(0,1)将数组拆分为2个数组,对距离上的两个数组进行排序,然后将它们与赞助商= 1合并在新的多维数组的顶部。这是这样做的吗?
感谢您的投入。
答案 0 :(得分:3)
这是usort建议的略微修改版本。假设源数组名为$ arr:
usort(
$arr, function($a, $b) {
if ( $a['sponsor'] == $b['sponsor'] ) {
if ( $a['distance'] == $b['distance'] ) {
return 0;
}
return $a['distance'] < $b['distance'] ? -1 : 1;
}
return $a['sponsor'] > $b['sponsor'] ? -1 : 1;
}
);
答案 1 :(得分:1)
您必须将原始数组拆分为2个数组:1st包含sponsor=1
,2nd包含sponsor=0
。然后单独对它们进行排序并合并。
不知怎的这样:
$array1 = array_filter($array, function ($v) { return $v['sponsor'] == 1; });
$array2 = array_filter($array, function ($v) { return $v['sponsor'] == 0; });
function cmp($a, $b) {
return $a['distance'] < $b['distance']? -1 : 1;
}
usort($array1, cmp);
usort($array2, cmp);
$result = array_merge($array1, $array2);
答案 2 :(得分:0)
这样可行,但如果您使用stable sorting algorithm,那么您可以先按距离排序,然后按赞助商降序排序,您将获得所需的结果。
答案 3 :(得分:0)
您可以使用array_multisort()函数来实现所需的功能:
<?php
$arr = [
['id' => 1, 'distance' => 5, 'sponsor' => 0],
['id' => 20, 'distance' => 8, 'sponsor' => 1],
['id' => 25, 'distance' => 10, 'sponsor' => 0],
['id' => 78, 'distance' => 25, 'sponsor' => 1],
];
$sponsor = array_column($arr, 'sponsor');
$distance = array_column($arr, 'distance');
// rearrange $arr by sponsor DESC and then by distance ASC
array_multisort($sponsor, SORT_DESC, $distance, SORT_ASC, $arr);
print_r($arr);
答案 4 :(得分:-1)
试试这个:
<?php
$ar = array(
array("10", 11, 100, 100, "a"),
array( 1, 2, "2", 3, 1)
);
array_multisort($ar[0], SORT_ASC, SORT_STRING,
$ar[1], SORT_NUMERIC, SORT_DESC);
var_dump($ar);
?>
或
<?php
$ar1 = array(10, 100, 100, 0);
$ar2 = array(1, 3, 2, 4);
array_multisort($ar1, $ar2);
var_dump($ar1);
var_dump($ar2);
?>