本文執行個體講述了php產生固定長度純數字編碼的方法。分享給大家供大家參考。具體如下： 很多時候我們需要一些固定長度的數字編碼，如訂單編號、卡號、使用者編號等等！但是經常我們有的是儲存在資料庫中的有序編號，我們可以通過它直接轉成一個固定長度的數字編碼，然後更新到資料庫中形成此記錄的唯一編號。
- /**
- * 根據日期或者是給定首碼產生唯一編號
- * User: minyifei.cn
- * Date: 15/7/7
- */
- namespace Minyifei\Libs;
- class SequenceNumber {
- /**
- * 根據顯示寬度擷取指定的 mapbit
- *
- * @param integer $width 編號顯示寬度
- *
- * @return array
- */
- private static function _getMapbit($width)
- {
- $mapBits = array(
- 4=>array(
- 10, 2, 11, 3, 0, 1, 9, 7, 12, 6, 4, 8, 5,
- ),
- 5=>array(
- 4, 3, 13, 15, 7, 8, 6, 2, 1, 10, 5, 12, 0, 11, 14, 9,
- ),
- 6=>array(
- 2, 7, 10, 9, 16, 3, 6, 8, 0, 4, 1, 12, 11, 13, 18, 5, 15, 17, 14,
- ),
- 7=>array(
- 18, 0, 2, 22, 8, 3, 1, 14, 17, 12, 4, 19, 11, 9, 13, 5, 6, 15, 10, 16, 20, 7, 21,
- ),
- 8=>array(
- 11, 8, 4, 0, 16, 14, 22, 7, 3, 5, 13, 18, 24, 25, 23, 10, 1, 12, 6, 21, 17, 2, 15, 9, 19, 20,
- ),
- 9=>array(
- 24, 23, 27, 3, 9, 16, 25, 13, 28, 12, 0, 4, 10, 18, 11, 2, 17, 1, 21, 26, 5, 15, 7, 20, 22, 14, 19, 6, 8,
- ),
- 10=>array(
- 32, 3, 1, 28, 21, 18, 30, 7, 12, 22, 20, 13, 16, 15, 6, 17, 9, 25, 11, 8, 4, 27, 14, 31, 5, 23, 24, 29, 0, 10, 19, 26, 2,
- ),
- 11=>array(
- 9, 13, 2, 29, 11, 32, 14, 33, 24, 8, 27, 4, 22, 20, 5, 0, 21, 25, 17, 28, 34, 6, 23, 26, 30, 3, 7, 19, 16, 15, 12, 31, 1, 35, 10, 18,
- ),
- 12=>array(
- 31, 4, 16, 33, 35, 29, 17, 37, 12, 28, 32, 22, 7, 10, 14, 26, 0, 9, 8, 3, 20, 2, 13, 5, 36, 27, 23, 15, 19, 34, 38, 11, 24, 25, 30, 21, 18, 6, 1,
- ),
- );
- return $mapBits[intval($width)];
- }
- /**
- * 格式化給定時間戳記
- *
- * @param integer $ts timestamp, if null use current timestamp
- *
- * @return string
- */
- private static function _fmtTS($ts=null)
- {
- $ts = $ts ?: time();
- return date(self::$_fmt, $ts);
- }
- /**
- * 根據id擷取一個隨機唯一編碼
- * @param $id 編號
- * @param int $prefix 首碼
- * @param int $width 除首碼外長度
- * @return string
- */
- public static function generateNumber($id,$prefix=10,$width=8)
- {
- return sprintf("%s%s", $prefix,self::encode($id, $width));
- }
- /**
- * 編碼轉換
- *
- * @param integer $id id
- * @param integer $width 編號額外組成部分的顯示寬度
- *
- * @return integer
- */
- public static function encode($id, $width)
- {
- $maximum = intval(str_repeat(9, $width));
- $superscript = intval(log($maximum) / log(2));
- $r = 0;
- $sign = 0x1 << $superscript;
- $id |= $sign;
- $mapbit = self::_getMapbit($width);
- for ($x = 0; $x < $superscript; $x++) {
- $v = ($id >> $x) & 0x1;
- $r |= ($v << $mapbit[$x]);
- }
- $r += $maximum - pow(2, $superscript) + 1;
- return sprintf("%0${width}s", $r);
- }
- /**
- * 擷取唯一編號
- *
- * @param integer $id id, mostly database primary key
- * @param integer $width 編號顯示寬度
- * @param integer $ts timestamp
- *
- * @return string
- */
- public static function get($id, $width, $ts=null)
- {
- return sprintf('%s%s', self::_fmtTS($ts), self::encode($id, $width));
- }
- }
複製代碼希望本文所述對大家的php程式設計有所協助。 |
