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$cid = sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x', // 32 bits for "time_low" mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), // 16 bits for "time_mid" mt_rand( 0, 0xffff ), // 16 bits for "time_hi_and_version", // four most significant bits holds version number 4 mt_rand( 0, 0x0fff ) | 0x4000, // 16 bits, 8 bits for "clk_seq_hi_res", // 8 bits for "clk_seq_low", // two most significant bits holds