PHP如何生成一个独一无二的GUID（UUID）字符串？

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python/*** 生成GUID（UUID）* @access public* @return string* @author knight*/function createGuid() { if (function_exists('com_create_guid')) { return com_create_guid(); } else { mt_srand((double)microtime() * 10000); $charid=strtoupper(md5(uniqid(rand(), true))); return $charid; }}

/** * 生成GUID（UUID） * @access public * @return string * @author knight */ function createGuid() { if (function_exists('com_create_guid')){ return com_create_guid(); }else{ mt_srand((double)microtime()*10000); $charid = strtoupper(md5(uniqid(rand(), true))); $hyphen = chr(45);// "-" $uuid = chr(123)// "{" .substr($charid, 0, 8).$hyphen .substr($charid, 8, 4).$hyphen .substr($charid,12, 4).$hyphen .substr($charid,16, 4).$hyphen .substr($charid,20,12) .chr(125);// "}" return $uuid; } }