Based on the Twitter Snowflake algorithm

functions list:

• 1. string ukey_next_id(void);
        Get the next unique ID.
     
• 2. int ukey_to_timestamp(string ID);
        Change unique ID to timestamp.
     
• 3. array ukey_to_machine(string ID);
        Change unique ID to machine info.
     

<?php
$id = ukey_next_id();
echo $id;
$timestamp = ukey_to_timestamp($id);
echo date('Y-m-d H:i:s', $timestamp);
?>

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

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