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Generate Steam DeviceID by SteamID for accepting mobile confirmations
* Generate device id by steamid
* Usage: getDeviceID('steamid');
* @param string $steamid SHOULD BE STRING
* @return string
function getDeviceID($steamid) {
$sha1 = sha1($steamid);
$cut = substr($sha1, 0, 32);
$deviceID = preg_replace('/^([0-9a-f]{8})([0-9a-f]{4})([0-9a-f]{4})([0-9a-f]{4})([0-9a-f]{12}).*$/', '$1-$2-$3-$4-$5', $cut);
$prepend = 'android:';
return $prepend . $deviceID;
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