Subversion Repositories uuid_mac_utils

Rev

Rev 70 | Rev 72 | Go to most recent revision | Show entire file | Regard whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 70 Rev 71
Line 1250... Line 1250...
1250 
        // Version = 7
 1250 
        // Version = 7
1251 
        $uuid_nibbles .= '7';
 1251 
        $uuid_nibbles .= '7';
1252 
 
 1252 
 
1253 
        // Optional: millisecond fraction (max 12 bits)
 1253 
        // Optional: millisecond fraction (max 12 bits)
1254 
        if (($num_ms_frac_bits < 0) || ($num_ms_frac_bits > 12)) throw new Exception("Invalid msec frac bits (must be 0..12)");
 1254 
        if (($num_ms_frac_bits < 0) || ($num_ms_frac_bits > 12)) throw new Exception("Invalid msec frac bits (must be 0..12)");
1255 
        if ($num_ms_frac_bits > 0) {
 - 
 
1256 
                $seconds_fraction = (float)explode(' ',microtime(false))[0];
 - 
 
1257 
                $nanoseconds_fraction = $seconds_fraction * 1000000;
 - 
 
1258 
                $resolution_ns = 1000000 / pow(2,$num_ms_frac_bits);
 1255 
        $resolution_ns = 1000000 / pow(2,$num_ms_frac_bits);
- 
 
 1256 
        if ($num_ms_frac_bits > 0) {
- 
 
 1257 
                $seconds_fraction = (float)explode(' ',microtime(false))[0]; // <sec=0>,<msec>
- 
 
 1258 
 
- 
 
 1259 
                $ms_fraction = $seconds_fraction * 1000; // <msec>,<us>
- 
 
 1260 
                $ms_fraction -= floor($ms_fraction); // <msec=0>,<us>
- 
 
 1261 
 
- 
 
 1262 
                $ns_fraction = $ms_fraction * 1000000; // <ns>
1259 
                $val = (int)ceil($nanoseconds_fraction / $resolution_ns);
 1263 
                $val = (int)ceil($ns_fraction / $resolution_ns);
1260 
 
 1264 
 
1261 
                // Currently, for the output we only allow frac bits 0, 4, 8, 12 (0-3 nibbles),
 1265 
                // Currently, for the output we only allow frac bits 0, 4, 8, 12 (0-3 nibbles),
1262 
                // since UUIDs are usually sorted in their hex notation
 1266 
                // since UUIDs are usually sorted in their hex notation
1263 
                $num_nibbles = (int)ceil($num_ms_frac_bits/4);
 1267 
                $num_nibbles = (int)ceil($num_ms_frac_bits/4);
1264 
                $nibble_string = str_pad(dechex($val), $num_nibbles, '0', STR_PAD_LEFT);
 1268 
                $uuid_nibbles .= str_pad(dechex($val), $num_nibbles, '0', STR_PAD_LEFT);
1265 
                $uuid_nibbles .= $nibble_string;
 - 
 
1266 
        } else {
 - 
 
1267 
                $resolution_ns = 1000000;
 - 
 
1268 
        }
 1269 
        }
1269 
 
 1270 
 
1270 
        // TODO Not implemented: Optional counter (to be defined as parameter to this method)
 1271 
        // TODO Not implemented: Optional counter (to be defined as parameter to this method)
1271 
        // The counter bits need to be spread before and after the variant bits
 1272 
        // The counter bits need to be spread before and after the variant bits
1272 
 
 1273 
 
Line 1274... Line 1275...
1274 
        $uuid = gen_uuid_random();
 1275 
        $uuid = gen_uuid_random();
1275 
        $uuid = str_replace('-', '', $uuid);
 1276 
        $uuid = str_replace('-', '', $uuid);
1276 
        for ($i=0; $i<strlen($uuid_nibbles); $i++) $uuid[$i] = $uuid_nibbles[$i];
 1277 
        for ($i=0; $i<strlen($uuid_nibbles); $i++) $uuid[$i] = $uuid_nibbles[$i];
1277 
 
 1278 
 
1278 
        // Wait to make sure that the time part changes if multiple UUIDs are generated
 1279 
        // Wait to make sure that the time part changes if multiple UUIDs are generated
1279 
        // We don't use usleep(), because it often does not sleep long enough!
 - 
 
1280 
        //       $resolution_us = (int)ceil($resolution_ns/1000);
 1280 
        if (time_nanosleep(0,(int)ceil($resolution_ns)) !== true) usleep((int)ceil($resolution_ns/1000));
1281 
        //       if ($resolution_us > 0) usleep($resolution_us);
 - 
 
1282 
        // We use this naive approach instead:
 - 
 
1283 
        if ($num_ms_frac_bits > 0) {
 - 
 
1284 
                $seconds_fraction = (float)explode(' ',microtime(false))[0];
 - 
 
1285 
                $nanoseconds_fraction = $seconds_fraction * 1000000;
 - 
 
1286 
                $resolution_ns = 1000000 / pow(2,$num_ms_frac_bits);
 - 
 
1287 
                $val = (int)ceil($nanoseconds_fraction / $resolution_ns);
 - 
 
1288 
                do {
 - 
 
1289 
                        $seconds_fraction = (float)explode(' ',microtime(false))[0];
 - 
 
1290 
                        $nanoseconds_fraction = $seconds_fraction * 1000000;
 - 
 
1291 
                        $resolution_ns = 1000000 / pow(2,$num_ms_frac_bits);
 - 
 
1292 
                        $val2 = (int)ceil($nanoseconds_fraction / $resolution_ns);
 - 
 
1293 
                } while ($val == $val2);
 - 
 
1294 
        } else {
 - 
 
1295 
                $unix_ts = dechex((int)ceil(microtime(true)*1000));
 - 
 
1296 
                do {
 - 
 
1297 
                        $unix_ts2 = dechex((int)ceil(microtime(true)*1000));
 - 
 
1298 
                } while ($unix_ts == $unix_ts2);
 - 
 
1299 
        }
 - 
 
1300 
 
 1281 
 
1301 
        // Output
 1282 
        // Output
1302 
        return substr($uuid,  0, 8).'-'.
 1283 
        return substr($uuid,  0, 8).'-'.
1303 
               substr($uuid,  8, 4).'-'.
 1284 
               substr($uuid,  8, 4).'-'.
1304 
               substr($uuid, 12, 4).'-'.
 1285 
               substr($uuid, 12, 4).'-'.