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@ 2019-10-17T09:41:56Z

<?php

$array =
[
    0 => [
        "groupid"  => "5",
        "radminid" => "1",
        "type"     => "system",
        "system"   => "private",
    ],
    1 => [
        "groupid"  => "10",
        "radminid" => "2",
        "type"     => "system",
        "system"   => "private",
    ],
];
$array = array_column($array, null, 'groupid');
print_r($array);die;

Output
Performance
VLD
References
Branches

array_column: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive previewkey bindings

30.97 ms | 406 KiB | 5 Q