如何按这些对象键对包含对象的数组进行排序[复制]

Question

This question already has an answer here:

• How do I Sort a Multidimensional Array in PHP [duplicate] 11 answers

I have such an array that I need to be able to sort by keys ASC and DESC

Array
(
    [0] => stdClass Object
        (
            [id] => 2323
            [regno] => 45101008785
            [regdate] => 1993-03-26
        )

    [1] => stdClass Object
        (
            [id] => 2322
            [regno] => 49201003827
            [regdate] => 1992-04-08
        )

    [2] => stdClass Object
        (
            [id] => 2318
            [regno] => 240100720
            [regdate] => 1992-10-01
        )

    [3] => stdClass Object
        (
            [id] => 2317
            [regno] => 900100881
            [regdate] => 1992-12-28
        )
)

IE, if client sets GET parameters to ?sort_by=regno&type=asc, I need to sort this via PHP to:

Array
(

    [0] => stdClass Object
        (
            [id] => 2318
            [regno] => 240100720
            [regdate] => 1992-10-01
        )

    [1] => stdClass Object
        (
            [id] => 2317
            [regno] => 900100881
            [regdate] => 1992-12-28
        )

    [2] => stdClass Object
        (
            [id] => 2323
            [regno] => 45101008785
            [regdate] => 1993-03-26
        )

    [3] => stdClass Object
        (
            [id] => 2322
            [regno] => 49201003827
            [regdate] => 1992-04-08
        )
)

How is this done?

</div>

Answer 1

I havent tested this - but it should be close.

Have these two functions

function sorter($type, $key) 
{
    if ($type === 'asc')
    {
        return function ($a, $b) use ($key) {
            return strcmp($a->{$key}, $b->{$key});
        };
    }
    else
    {
        return function ($a, $b) use ($key) {
            return strcmp($b->{$key}, $a->{$key});
        };
    }
}

Then in your code

usort($array, sorter($type, $sort_by));

Example #4 on php.net should give you further help as well