按距离多重排序

Question

I have a multidimensional array and want to sort it by distance:

[clustermarkers] => [
            0 => [
                    0 => [
                      'name' => 'A',
                      'distance' => 10
                    ]
            ],
            1 => [
                    0 => [
                      'name' => 'B',
                      'distance' => 8
                    ]
            ],
            ...
];

I have tried usort function, but something wrong:

usort($clustermarkers, function($a, $b) {
   return (int)$a['distance'] - (int)$b['distance'];
});

Answer 1

In your usort function, just add [0] to $a and $b before ['distance']

usort($clustermarkers, function ($a, $b) {
    return $a[0]['distance'] - $b[0]['distance'];
});

print_r($clustermarkers);