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dekuan/dedid
An unique id generator for primary key of distributed database. This implementation of the algorithm reference Twitter Snowflake, but in the last 12 bits you can not only use random numbers, but also get a hash value by a specified string.
ALGORITHM
Bit structure
It's a 64 bits bigint.
0 xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx x xxxxx xxxxx xxxx xxxxxxxx
Details
Position | Length | Usage | Remark |
---|---|---|---|
0 | 1 | Reserved | Always be 0 |
1~41 | 41 | Escaped Time (in millisecond) | 0~69 years |
42~46 | 5 | Number of data center | 0~31 |
47~51 | 5 | Number of data node in the data center | 0~31 |
52~63 | 12 | Random / Hash | 0~4095 |
Bit marks
Center
0 00000000 00000000 00000000 00000000 00000000 0 11111 00000 0000 00000000
00000000 00000000 00000000 00000000 00000000 00111110 00000000 00000000
00 00 00 00 00 3E 00 00
Node
0 00000000 00000000 00000000 00000000 00000000 0 00000 11111 0000 00000000
00000000 00000000 00000000 00000000 00000000 00000001 11110000 00000000
00 00 00 00 00 01 F0 00
Escaped Time
0 11111111 11111111 11111111 11111111 11111111 1 00000 00000 0000 00000000
01111111 11111111 11111111 11111111 11111111 11000000 00000000 00000000
7F FF FF FF FF C0 00 00
Random or Hash value
0 00000000 00000000 00000000 00000000 00000000 0 00000 00000 1111 11111111
00000000 00000000 00000000 00000000 00000000 00000000 00001111 11111111
00 00 00 00 00 00 0F FF
HOW TO USE
Create an new id normally
$cDId = CDId::getInstance();
$nCenter = 0;
$nNode = 1;
$arrD = [];
$nNewId = $cDId->createId( $nCenter, $nNode, null, $arrD ); echo "new id = " . $nNewId . "\r\n"; print_r( $arrD );
output
new id = 114654484990270790
Array
(
[center] => 0
[node] => 1
[time] => 27335759399 [rand] => 3398 )
Create an new id with crc32 hash value by a specified string
$cDId = CDId::getInstance();
$nCenter = 0;
$nNode = 15;
$sSrc = "dekuan";
$arrD = []; $nNewId = $cDId->createId( $nCenter, $nNode, $sSrc, $arrD ); echo "new id = " . $nNewId . "\r\n"; print_r( $arrD );
output
new id = 114654631304370386
Array
(
[center] => 0
[node] => 1
[time] => 27335794283 [rand] => 2258 )
Parse an id for getting the details
$cDId = CDId::getInstance();
$arrId = $cDId->parseId( 114654631304370386 );
print_r( $arrId );
output
Array
(
[center] => 0
[node] => 1
[time] => 27335794283
[rand] => 2258 )
INSTALL
# composer require dekuan/dedid
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