PHP降序存储从foreach循环值存储的数组

问题描述：

i have a foreach loop like this

$ids = array();
foreach( $idsvalues as $idv ){
    $ids[$idv->id][] = $idv->value;
}

and i get an array like this

Array ( [21] => 10 [13] => 16 [12] => 20 [7] => 28 )

now how do i descending this array() values only from lowest to highest without effecting the array keys or id? to show like this

Array ( [21] => 28 [13] => 20 [12] => 16 [7] => 10 );

the array can contain upto 100 such ids and values so basically just descending the values?

答

Since you want to preserve the keys, transfer them to a separate array by using array_keys now rsort your array (i.e. descending order) , Make use of array_combine to link the grabbed keys and descending sorted values.

<?php
$arr=Array ( 21 => 10, 13 => 16, 12 => 20, 7 => 28 );
$k_arr=array_keys($arr);
rsort($arr);
$new_arr=array_combine($k_arr,$arr);
print_r($new_arr);

Output:

Array
(
    [21] => 28
    [13] => 20
    [12] => 16
    [7] => 10
)

Demo

PHP降序存储从foreach循环值存储的数组

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