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<?php
namespace Faker\Provider;
class Uuid extends Base
{
/**
* Generate name based md5 UUID (version 3).
*
* @example '7e57d004-2b97-0e7a-b45f-5387367791cd'
*/
public static function uuid()
{
// fix for compatibility with 32bit architecture; each mt_rand call is restricted to 32bit
// two such calls will cause 64bits of randomness regardless of architecture
$seed = self::numberBetween(0, 2147483647) . '#' . self::numberBetween(0, 2147483647);
// Hash the seed and convert to a byte array
$val = md5($seed, true);
$byte = array_values(unpack('C16', $val));
// extract fields from byte array
$tLo = ($byte[0] << 24) | ($byte[1] << 16) | ($byte[2] << 8) | $byte[3];
$tMi = ($byte[4] << 8) | $byte[5];
$tHi = ($byte[6] << 8) | $byte[7];
$csLo = $byte[9];
$csHi = $byte[8] & 0x3f | (1 << 7);
// correct byte order for big edian architecture
if (pack('L', 0x6162797A) == pack('N', 0x6162797A)) {
$tLo = (($tLo & 0x000000ff) << 24) | (($tLo & 0x0000ff00) << 8)
| (($tLo & 0x00ff0000) >> 8) | (($tLo & 0xff000000) >> 24);
$tMi = (($tMi & 0x00ff) << 8) | (($tMi & 0xff00) >> 8);
$tHi = (($tHi & 0x00ff) << 8) | (($tHi & 0xff00) >> 8);
}
// apply version number
$tHi &= 0x0fff;
$tHi |= (3 << 12);
// cast to string
return sprintf(
'%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x',
$tLo,
$tMi,
$tHi,
$csHi,
$csLo,
$byte[10],
$byte[11],
$byte[12],
$byte[13],
$byte[14],
$byte[15]
);
}
}