生成v4 UUID的PHP函数
xxxxxxx-xxxx- 4XXX- yxxx-xxxxxxxxxx
<?phpfunction gen_uuid() { $uuid = array( 'time_low' => 0, 'time_mid' => 0, 'time_hi' => 0, 'clock_seq_hi' => 0, 'clock_seq_low' => 0, 'node' => array() ); $uuid['time_low'] = mt_rand(0, 0xffff) + (mt_rand(0, 0xffff) << 16); $uuid['time_mid'] = mt_rand(0, 0xffff); $uuid['time_hi'] = (4 << 12) | (mt_rand(0, 0x1000)); $uuid['clock_seq_hi'] = (1 << 7) | (mt_rand(0, 128)); $uuid['clock_seq_low'] = mt_rand(0, 255); for ($i = 0; $i < 6; $i++) { $uuid['node'][$i] = mt_rand(0, 255); } $uuid = sprintf('%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x', $uuid['time_low'], $uuid['time_mid'], $uuid['time_hi'], $uuid['clock_seq_hi'], $uuid['clock_seq_low'], $uuid['node'][0], $uuid['node'][1], $uuid['node'][2], $uuid['node'][3], $uuid['node'][4], $uuid['node'][5] ); return $uuid;}?>
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