IdGenerator.inc.php

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<?php

namespace HCE\transport {

        class IdGenerator {
                public function __construct() {
                }

                public function __destruct() {
                }

                public static function getClientId($type = 1, $prefix = null) {
                        if ($prefix === null) {
                                $prefix = date ( 'Y-m-d H:i:s' ) . '-' . microtime ( true ) . '-';
                        }

                        $ret = PROTOCOL_CLIENT_IDENTITY_PREFIX . $prefix;

                        if ($type == 0) {
                                // Simple fast
                                $ret .= self::getUniqueId ( 1 );
                        } else {
                                // More accurate complexity
                                $ret .= self::getUniqueId ( 3 ) . '-' . self::getUniqueId ( 5 );
                        }

                        return $ret;
                }

                public static function getMessageId($type = 1, $prefix = '') {
                        $ret = PROTOCOL_MSG_ID_PREFIX . $prefix;

                        if ($type == 0) {
                                // Simple fast
                                $ret .= self::getUniqueId ( 0 );
                        } else {
                                // More accurate complexity
                                $ret .= self::getUniqueId ( 4 );
                        }

                        return $ret;
                }

                public static function getUniqueId($type = 0) {
                        $ret = null;

                        if ($type == 0) {
                                // Complex string
                                $ret = uniqid ( md5 ( rand () ), true );
                        } elseif ($type == 1) {
                                // Complex string hexadec
                                $ret = dechex ( time () ) . dechex ( mt_rand ( 1, 65535 ) );
                        } elseif ($type == 2) {
                                // Random for better crypto cypher hexadec
                                $r = unpack ( 'v*', fread ( fopen ( '/dev/random', 'r' ), 16 ) );
                                $ret = sprintf ( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x', $r [1], $r [2], $r [3], $r [4] & 0x0fff | 0x4000, $r [5] & 0x3fff | 0x8000, $r [6], $r [7], $r [8] );
                        } elseif ($type == 3) {
                                // Host name and microseconds
                                $ret = uniqid ( php_uname ( 'n' ) . '-', true );
                        } elseif ($type == 4) {
                                // Another fast useful for file name
                                $ret = time () . substr ( md5 ( microtime ( true ) ), 0, rand ( 5, 12 ) );
                        } elseif ($type == 5) {
                                // The field names refer to RFC 4122 section 4.1.2
                                $ret = sprintf ( '%04x%04x-%04x-%03x4-%04x-%04x%04x%04x', mt_rand ( 0, 65535 ), mt_rand ( 0, 65535 ),                           // 32 bits for "time_low"
                                mt_rand ( 0, 65535 ),                           // 16 bits for "time_mid"
                                mt_rand ( 0, 4095 ),                            // 12 bits before the 0100 of (version) 4 for "time_hi_and_version"
                                bindec ( substr_replace ( sprintf ( '%016b', mt_rand ( 0, 65535 ) ), '01', 6, 2 ) ),
                                                // 8 bits, the last two of which (positions 6 and 7) are 01, for "clk_seq_hi_res"
                                                // (hence, the 2nd hex digit after the 3rd hyphen can only be 1, 5, 9 or d)
                                                // 8 bits for "clk_seq_low"
                                                mt_rand ( 0, 65535 ), mt_rand ( 0, 65535 ), mt_rand ( 0, 65535 ) ); // 48 bits for "node"
                        }

                        return $ret;
                }
        }
}

?>