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@ 2015-03-18T01:25:30Z

<?php
    $users[923] = 'TelRev';
    $users[100] = 'Skellington';
    $users[1202] = 'CapnBlack';
    $userids = array_keys($users);
    var_dump($userids);
?>

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_keys: documentation ( source)

preferences:dark modelive preview

51.56 ms | 402 KiB | 5 Q