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@ 2021-08-03T14:39:19Z

<?php

$toSort = array(
    1 => 
        [
            'value' =>  8000,
            'key'   => 1007
        ],
    2 => 
        [
            'value' => 8001,
            'key'   => 1007
        ],
    3 => 
        [
            'value' => 8002,
            'key'   => 1013
        ],
);

$result = [];
foreach ($toSort as ['value' => $value, 'key' => $key]) {
    $result[$key][] = $value;
}
var_export($result);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)

preferences:dark modelive previewkey bindings

72.06 ms | 404 KiB | 5 Q