liexusong / atom

PHP unique ID generator

Atom

PHP unique ID generator, based on the Twitter snowflake algorithm

APIs:

/*
 * Get the next unique ID
 */
string atom_next_id()

/*
 * Change unique ID to array includes: timestamp, datacenter id and worker id
 */
array atom_explain(string $id)

example:

<?php
$id = atom_next_id();
echo $id;

$info = atom_explain($id);
echo date('Y-m-d H:i:s', $info['timestamp']);
?>

install:

$  cd ./atom
$  phpize
$  ./configure
$  make
$  sudo make install

php.ini configure entries:

[atom]
atom.datacenter = integer
atom.worker = integer
atom.twepoch = uint64

atom's Issues

ukey在命令行下报错。

···

配置项可以由PHP传参数么？

多个数据中心，多个server。要是每个php.ini都配置成不一样的话，感觉不太好。个人觉得通过PHP读取env环境变量，传参好些。

ukey.datacenter = integer
ukey.worker = integer
ukey.twepoch = uint64

PHP服务重启后。获得ID连不上了。

PHP服务重启后。获得ID连不上了。

ukey.worker = 1
ukey.datacenter = 1
这两个配置能详细点吗？比如一个运用复本，同是运行在3台服务器上，随机请求其中一台。怎么获得连续的ID，这个ID写入数据库后看上去不是连续的？

ukey_to_timestamp($id);这个时间在运用中有啥用。能给个例子吗？

compile warning

ukey.c:244:14: warning: comparison between pointer and integer [enabled by default]
if (lock == pid) {

ukey_to_machine 结果不对

在 php.ini 里面配置了 ukey.worker，生成 $id 反解出的机器 id 不对。而且每次都不一样。

PHP Version 5.1.6下加载告警undefined symbol: __sync_bool_compare_and_swap_4 in Unknown on line 0

RT

编译出错

make 的时候出错，centos 64bit php版本 5.3.3 5.6.3都是一样
In file included from /home/wangyi/ukey-master/ukey.c:33:
/home/wangyi/ukey-master/php_ukey.h:75: error: conflicting types for ‘__uint64_t’
/usr/include/bits/types.h:45: note: previous declaration of ‘__uint64_t’ was here
/home/wangyi/ukey-master/ukey.c: In function ‘ukey_startup’:
/home/wangyi/ukey-master/ukey.c:136: warning: assignment from incompatible pointer type
/home/wangyi/ukey-master/ukey.c:137: warning: assignment from incompatible pointer type
/home/wangyi/ukey-master/ukey.c:147: warning: assignment from incompatible pointer type
/home/wangyi/ukey-master/ukey.c: In function ‘exit_cb’:
/home/wangyi/ukey-master/ukey.c:193: warning: comparison between pointer and integer
make: *** [ukey.lo] Error 1

居然产生了同样的id

server上跑了几个php进程.发现几个进程直接居然取到同一个id了.

please add more doc, please

advise to add your blog link

i came this project from your blog, advise to add the blog url to readme file

some question

atom_explain($id) return timestamp / datacenter / worker, but i use the code below to test, datacenter and worker are the same, do you make change to the snowflake algorithm ?

for ($i=0; $i < 20; $i++) {
    $id = atom_next_id(); // is different
    $info = atom_explain($id);
    echo $id . "\t" . date('YmdHis', $info['timestamp']) . "\t" . $info['datacenter'] . "\t" . $info['worker'] . "\n"; // $info are the same
}