php生成uuid与php图片上传微秒命名文件名

2. function guid(){
3. if (function_exists('com_create_guid')){
4. return com_create_guid();
5. }else{
6. mt_srand((double)microtime()*10000);//optional for php 4.2.0 and up.
7. $charid = strtoupper(md5(uniqid(rand(), true)));
8. $hyphen = chr(45);// "-"
9. $uuid = chr(123)// "{"
10. .substr($charid, 0, 8).$hyphen
11. .substr($charid, 8, 4).$hyphen
12. .substr($charid,12, 4).$hyphen
13. .substr($charid,16, 4).$hyphen
14. .substr($charid,20,12)
15. .chr(125);// "}"
16. return $uuid;
17. }
18. }

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