[英]sort multidimensional array twice
我已经按照从低到高的值距离对多维数组进行了排序。 这是输出示例:(实际输出大约有20或30个数组)。
数组(
[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
)
)
按从低到高的距离排序后,如果保荐人= 1,我想优先考虑。这是首选输出:
数组(
[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
)
)
发起人是0或1。如何解决此问题? 我想到的是,在对距离进行排序之前,我应该根据发起人(0,1)将数组分成2个数组,对两个数组进行按距离排序,然后在新的多维数组顶部将它们与Sponsor = 1合并。 这是这样做的方法吗?
谢谢您的意见。
这是usort建议的稍作修改的版本。 假设源数组称为$ 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;
}
);
您必须将原始数组拆分为2个数组:1st具有sponsor=1
1,2nd具有sponsor=0
。 然后将它们分别排序并合并。
像这样:
$array1 = array_filter($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);
那会行得通,但是如果您使用稳定的排序算法,则可以先按距离排序,然后按赞助商降序排序,您将获得所需的结果。
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);
尝试这个 :
<?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);
?>
要么
<?php
$ar1 = array(10, 100, 100, 0);
$ar2 = array(1, 3, 2, 4);
array_multisort($ar1, $ar2);
var_dump($ar1);
var_dump($ar2);
?>
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