PHP 生成16 uuid

从c# 翻译而来

<?php
    $i=1;
    $guidStr=string_make_guid();
    echo $guidStr."\n";
    $byte_array = unpack('C*', $guidStr);
    foreach ($byte_array as $value) {
        $i *= ((int)$value + 1);
    }
    $data=($i-(microtime(true) * 10000000));
    echo $data."\n";
    echo base_convert($data,10,16)."\n";

    function string_make_guid() {
      // 1、去掉中间的“-”，长度有36变为32
      // 2、字母由“大写”改为“小写”
      if (function_exists('com_create_guid') === true) {
          return strtolower(str_replace('-', '', trim(com_create_guid(), '{}')));
      }

      return sprintf('%04x%04x%04x%04x%04x%04x%04x%04x', mt_rand(0, 65535), mt_rand(0, 65535), mt_rand(0, 65535), mt_rand(16384, 20479),
          	       mt_rand(32768, 49151), mt_rand(0, 65535), mt_rand(0, 65535), mt_rand(0, 65535));
}
?>