php GUID生成函數和類 短摘: function create_guid () { $charid = strtoupper ( md5 ( uniqid ( mt_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 ; }