Sort 2d array rows by column with values end in clothing sizes/measurements, preserving row indexes

Question

My array looks like this:

Array (
[0] => Array
    (
        [id] => 613
        [kleur] => royalblauw/wit
        [maat] =>  maat XL
        [voorraad] => 100
        [sort] => 0
        [prijs] => 4.1320
    )

[1] => Array
    (
        [id] => 614
        [kleur] => royalblauw/wit
        [maat] =>  maat XXL
        [voorraad] => 100
        [sort] => 1
        [prijs] => 4.1320
    )

[2] => Array
    (
        [id] => 620
        [kleur] => zwart/wit
        [maat] =>  maat XL
        [voorraad] => 100
        [sort] => 2
        [prijs] => 4.1320
    ) 
       etc.etc.

What I want is to sort the array by 'maat' (size). As you can see there are multiple entries with same 'maat'.

This is what I have until now.

function cmp($a, $b)
{

$sizes = array(
"116" => 0,
"128" => 1,
"140" => 2,
"152" => 3,
"164" => 4,
"XXS" => 5,
"XS" => 6,
"S" => 7,
"M" => 8,
"L" => 9,
"XL" => 10,
"XXL" => 11,
"XXXL" => 12,
"XXXXL" => 13,
"XXXXXL" => 14
);

$asize = $sizes[$a];
$bsize = $sizes[$b];

if ($asize == $bsize) {
    return 0;
}

return ($asize > $bsize) ? 1 : -1;

}
function aasort (&$array, $key) {
    $sorter=array();
    $ret=array();
    reset($array);
    foreach ($array as $ii => $va) {
        $sorter[$ii]=$va[$key];
    }
    uasort($sorter, "cmp");
    foreach ($sorter as $ii => $va) {
        $ret[$ii]=$array[$ii];
    }
    $array=$ret;
}

And calling the function aasort:

aasort($maatkleur_array,"maat");

Answer 1

You want to sort an array of arrays. The parent array don't have a (named) key. uasort perserves the key wich you don't want in your case so use usort in stead:

error_reporting(E_ALL);
ini_set('display_errors','on');

function cmp($a, $b)
{

    $sizes = array('s'=>0,'m'=>'1','l'=>2,'xl'=>3);

    if ($sizes[$a['maat']] == $sizes[$b['maat']]) {
        return 0;
    }
    return ($sizes[$a['maat']] < $sizes[$b['maat']]) ? -1 : 1;
}



$input = array(
array('id'=>1,'kleur'=>'blauw','maat'=>'xl'),
array('id'=>2,'kleur'=>'blauw','maat'=>'m'),
array('id'=>1,'kleur'=>'blauw','maat'=>'s'),
array('id'=>2,'kleur'=>'blauw','maat'=>'m'),
array('id'=>3,'kleur'=>'blauw','maat'=>'l')
);

usort($input, "cmp");

print_r($input);