I have a function that is looping over a bunch of items that each look something like this:
[
{"Target":"col-one","Value":0.261},
{"Target":"col-two","Value":0.881},
{"Target":"col-three","Value":0.571},
{"Target":"col-four","Value":0}
]
I would like to re-order each item so that instead of going in ascending order, it goes something like col-one, col-four, col-three, col-two. Is there a relatively simple method that can accomplish this type of arbitrary sorting?
To be clear, I want the result to look like the following:
[
{"Target":"col-one","Value":0.261},
{"Target":"col-four","Value":0},
{"Target":"col-three","Value":0.571},
{"Target":"col-two","Value":0.881}
]
我有一个循环遍历一堆项目的函数，每个项目看起来像这样： \ ñ
<代码> [\ N { “目标”： “COL-一个”， “值”：0.261}，\ N { “目标”： “COL-2”， “值”：0.881} \ N { “目标”： “COL-3”， “值”：0.571}，\ N { “目标”： “COL-4”， “值”：0}
]
上
我想重新订购每个项目，以便不是按升序排列，而是类似col-one，col-four，col-three，col-two。 是否有一种相对简单的方法可以完成这种类型的任意排序？
要清楚，我希望结果如下所示：
[
{“Target”：“col-one”，“Value”：0.261}，
{“Target”：“col-four”，“Value”：0}，
{“Target “：”col-three“，”Value“：0.571}，
{”Target“：”col-two“，”Value“：0.881}
]
If you have an array that defines the sort order, like:
微信扫一扫$order = ['col-one', 'col-four', 'col-three', 'col-two'];
You can pass it into the usort comparison function and look up the sort index there. I think it's easier if you flip it so the text becomes the key.
$order = array_flip($order);
usort($items, function($a, $b) use ($order) {
return $order[$a->Target] <=> $order[$b->Target];
});
If you don't flip it first, you have to array_search repeatedly instead. (Unless there's a better way I don't know of.)
usort($items, function($a, $b) use ($order) {
return array_search($a->Target, $order) <=> array_search($b->Target, $order);
});
Two ways: sort the array using a custom callback function usort http://php.net/manual/en/function.usort.php , or write an array that's only the columns, then array_map to the new one: http://php.net/manual/en/function.array-map.php
Make a new array that shows the column order you want.
$columns = ['col-four', 'col-two', 'col-three', 'col-one'];
Apply a sort function that compares the two column names by their index:
usort($targets, function ($a, $b) use ($columns) {
return array_search($a->Target], $columns) - array_search($b->Target], $columns);
});
So we're sorting, by comparing the difference in index.
I think I understood your question , you want to sort your array in any order you want. You can use array_map
$json='[
{"Target":"col-one","Value":0.261},
{"Target":"col-two","Value":0.881},
{"Target":"col-three","Value":0.571},
{"Target":"col-four","Value":0}
]';
$order_to_sort=array('col-four','col-one','col-three','col-two');
$arr=json_decode($json);
function sortObjects($arr,$order_to_sort){
return array_map(function ($a)use($arr) { return array_filter($arr, function($elem) use($a){
return $elem->Target === $a;
}); }, $order_to_sort);
}
echo "<pre>";
print_r(sortObjects($arr,$order_to_sort));