| 1252,19 → 1252,20 |
|---|
| |
| // Optional: millisecond fraction (max 12 bits) |
| if (($num_ms_frac_bits < 0) || ($num_ms_frac_bits > 12)) throw new Exception("Invalid msec frac bits (must be 0..12)"); |
| $resolution_ns = 1000000 / pow(2,$num_ms_frac_bits); |
| if ($num_ms_frac_bits > 0) { |
| $seconds_fraction = (float)explode(' ',microtime(false))[0]; |
| $nanoseconds_fraction = $seconds_fraction * 1000000; |
| $resolution_ns = 1000000 / pow(2,$num_ms_frac_bits); |
| $val = (int)ceil($nanoseconds_fraction / $resolution_ns); |
| $seconds_fraction = (float)explode(' ',microtime(false))[0]; // <sec=0>,<msec> |
| |
| $ms_fraction = $seconds_fraction * 1000; // <msec>,<us> |
| $ms_fraction -= floor($ms_fraction); // <msec=0>,<us> |
| |
| $ns_fraction = $ms_fraction * 1000000; // <ns> |
| $val = (int)ceil($ns_fraction / $resolution_ns); |
| |
| // Currently, for the output we only allow frac bits 0, 4, 8, 12 (0-3 nibbles), |
| // since UUIDs are usually sorted in their hex notation |
| $num_nibbles = (int)ceil($num_ms_frac_bits/4); |
| $nibble_string = str_pad(dechex($val), $num_nibbles, '0', STR_PAD_LEFT); |
| $uuid_nibbles .= $nibble_string; |
| } else { |
| $resolution_ns = 1000000; |
| $uuid_nibbles .= str_pad(dechex($val), $num_nibbles, '0', STR_PAD_LEFT); |
| } |
| |
| // TODO Not implemented: Optional counter (to be defined as parameter to this method) |
| 1276,27 → 1277,7 |
|---|
| for ($i=0; $i<strlen($uuid_nibbles); $i++) $uuid[$i] = $uuid_nibbles[$i]; |
| |
| // Wait to make sure that the time part changes if multiple UUIDs are generated |
| // We don't use usleep(), because it often does not sleep long enough! |
| // $resolution_us = (int)ceil($resolution_ns/1000); |
| // if ($resolution_us > 0) usleep($resolution_us); |
| // We use this naive approach instead: |
| if ($num_ms_frac_bits > 0) { |
| $seconds_fraction = (float)explode(' ',microtime(false))[0]; |
| $nanoseconds_fraction = $seconds_fraction * 1000000; |
| $resolution_ns = 1000000 / pow(2,$num_ms_frac_bits); |
| $val = (int)ceil($nanoseconds_fraction / $resolution_ns); |
| do { |
| $seconds_fraction = (float)explode(' ',microtime(false))[0]; |
| $nanoseconds_fraction = $seconds_fraction * 1000000; |
| $resolution_ns = 1000000 / pow(2,$num_ms_frac_bits); |
| $val2 = (int)ceil($nanoseconds_fraction / $resolution_ns); |
| } while ($val == $val2); |
| } else { |
| $unix_ts = dechex((int)ceil(microtime(true)*1000)); |
| do { |
| $unix_ts2 = dechex((int)ceil(microtime(true)*1000)); |
| } while ($unix_ts == $unix_ts2); |
| } |
| if (time_nanosleep(0,(int)ceil($resolution_ns)) !== true) usleep((int)ceil($resolution_ns/1000)); |
| |
| // Output |
| return substr($uuid, 0, 8).'-'. |