按PHP中的值排序多维数组

Question

I have an array fetched from mysql database tables of type. I want to sort it in order of particular value.

$arr1=array(array(12, 8, 5, 34),
        array(54, 87, 32, 10),
        array(23, 76, 98, 13),
        array(53, 16, 24, 19));

How can i sort it by value? Like sorting by 2nd value should result to.

$arr1=array(array(12, 8, 5, 34),
        array(53, 16, 24, 19),
        array(23, 76, 98, 13),
        array(54, 87, 32, 10));

Answer 1

I like to use usort to solve these problems.

$sortKey = 1;
usort($arr1, function($a, $b) use($sortKey){
    return $a[$sortKey] - $b[$sortKey];
});

Answer 2

Got to agree with @RocketHazmat, array_multsort is a royal pain in the backside. usort is much easier to follow but I thought I'd have a go anyway:

$sortKey = 1;
array_multisort(array_map(function($v) use($sortKey){
    return $v[$sortKey];
}, $arr1), $arr1);

It only took 20 minutes... :(

Here's a demo : http://ideone.com/2rZYIz