Question

我想通过以下方式创建一个序列号。

序列号应在每月开始时返回01。

$stockno=dofetch(doquery("Select count(id) from vehicle",$dblink));
$stock_no= date("Ymd")."-".$stockno=$stockno["count(id)"]+1;

输出

20150424-01

20150424-02

20150424-03

...

20150430-120

20150501-121

20150501-122

20150502-122

但需要以下格式的结果，当新月启动序列将被重置时

20150424-01

20150424-02

20150424-03

...

20150430-120

20150501-01

20150501-02

20150502-03

新月开始再次重置为1

20150601-01

等

Answer 1

你走了，

您只需要获取最后插入的序列值。

$dateString = "20150424-03"; // get Last entry's date from database. ( date("Ymd"). Ex. 20150424-03
$dtData = split('-',$dateString); // $dtData[0] = date part, $dtData[1] = Prefix part
$month1 = date("m",strtotime($dtData[0])); //Get the month of retrived date

//$date2 = date("Ymd"); // Get current date
// OR 
$date2 = date("Ymd", strtotime("+1 day", strtotime($dtData[0]))); // OR Increment last-date by one day
$month2 = date("m",strtotime($date2));  // Get updated date's  month

// now calculate month difference between dates. if months are same, prefix will be increased else prefix will be reset to 1
$prefix = (($month2-$month1) == 0) ? str_pad(++$dtData[1], 2, '0', STR_PAD_LEFT) : str_pad(1, 2, '0', STR_PAD_LEFT);
echo $date2. '-'. $prefix;

简单，不需要对数据库进行任何更改

每个月在PHP中按序号重置序列号

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