php - date() 函数的问题。需要从月初开始计算

Question

好的，所以我有这个代码。

        else if($_POST['sdate'] == 'this month')
                {


                        $startdate = date("m/d/y");
                        $newdate = Datetime::createFromFormat("m/d/y",$startdate);
                        $dpicker = $newdate->format("Y-m-d");
                        echo $dpicker;

                        $enddates = date("m/d/y");
                        $newEdate = Datetime::createFromFormat("m/d/y",$enddates);
                        $newEdate->modify('-20 day');
                        $edpicker = $newEdate->format("Y-m-d");
                        echo $edpicker;



                        $thdate = $dpicker;
                        $thdates = $edpicker;
                        $sql = "SELECT * FROM orders WHERE loggedtime BETWEEN :times AND :time";
                        $q=$con->prepare($sql);
                        $q->bindparam(":time", $thdate);
                        $q->bindparam(":times", $thdates);
                        $q->execute();
                        while($data=$q->fetch(PDO::FETCH_ASSOC))
                        {
                            echo $data['customer'];
                        }

                }

所以现在 $edpicker 设置为从今天起回溯 20 天...我希望它计算出今天是 7 号，所以只回溯 7 天..我想要那个变量始终返回到该月的第一天。所以如果今天是 18 号.. 就会回到 18 天。

最好的方法是什么？

Answer 1

$firstDayOfMonth = new\DateTime('本月第一天');