生成唯一流水号：

/**
 * [contractNo 获取合同编号]
 * Author Yangjun <[cooljun@126.com]>
 * DateTime 2017-07-31
 * @param [type] $c_id [合同id]
 * @param [type] $b_apply_time [合同申请时间]
 * @return [type] [description]
 */
protected function contractNo($c_id,$b_apply_time){
 $yDate = array("A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z");
 $y = date(Y,strtotime($b_apply_time))-2017;
 return $yDate[$y].date("md",strtotime($b_apply_time)).floor($c_id/9999).str_pad($c_id%9999,5,0,STR_PAD_LEFT);
}

/**
 * [contractNo 根据合同编号获取合同id]
 * Author Yangjun <[cooljun@126.com]>
 * DateTime 2017-07-31
 * @param [type] $contractNo [合同编号]
 * @return [type] [description]
 */
protected function contractNoToId($contractNo){
 $n = substr($contractNo, 5,-5);
 $d = substr($contractNo,-5);
 return 9999*$n + (int)$d;
}

结果：

$this->contractNo("12312","2017-07-31");  //A0731102313
$this->contractNoToId("A0731102313"); //12312

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