PHP implementation ID Self-increment and specify number of digits

This article introduces the content of the PHP implementation ID self-increment and specify the number of bits, has a certain reference value, now share to everyone, the need for friends can refer to

In the development process often encountered such a folding requirements:

The ID value is self-increment and the length is 7 bits. Not enough in front with 0 to be padded.

With Hugh Implementation:

Mysql

ID char (7) NOT null default ' 0000000 ';

Common Methods for PHP setup

/** * @param $id * @return string|void */protected function Isnumauto ($id) {    if (strlen ($id) > 7) {        $this->_j son[' msg '] = ' id greater than 7 bits, does not meet the requirements ';       Return Self::alertjson ($this->_json);    }    if (strlen ($id) < 7) {         $newid = sprintf ("%07d", Intval ($id) + 1);          if (strlen ($NEWID) <= 7) {              return $newid;          } else {             $this->_json[' msg '] = ' ID is greater than 7 bits, does not meet the requirements ';              Return Self::alertjson ($this->_json);}}