Question

我有一个DateTime，我在本月和上个月创建了两个变量，使用格式（'m'）来获取月份的数字。然后我将它放入一个mysql查询，但查询在使用变量时不起作用，但如果我手动输入数字。我可以调用变量，它回应了两个正确的日期，所以我有点不知道为什么它不能在mysql查询中工作。

有什么想法吗？

由于

    $lastmonth = new DateTime();                                        
    $lastmonth->modify('-1 month');
    $lastmonth = $lastmonth->format('m');
    $thismonth = new DateTime();
    $thismonth = $thismonth->format('m');
    $thedate = "BETWEEN '2015-$lastmonth-16' AND '2015-$thismonth-15'";
    $query = ("SELECT unid FROM responses WHERE (date $thedate)");

    $stmt =  $db->prepare( $query );
    $stmt->execute();

我也尝试过：

    $lastmonth = new DateTime();                                        
    $lastmonth->modify('-1 month');
    $lastmonth = $lastmonth->format('m');
    $thismonth = new DateTime();
    $thismonth = $thismonth->format('m');
    $query = ("SELECT unid FROM responses WHERE (date BETWEEN '2015-$lastmonth-16' AND '2015-$thismonth-15')");

    $stmt =  $db->prepare( $query );
    $stmt->execute();

Answer 1

哟可以使用：

    $lastmonth = new DateTime();                                        
    $lastmonth->modify('-1 month');
    $lastmonth = $lastmonth->format('m');
    $thismonth = new DateTime();
    $thismonth = $thismonth->format('m');
    $thedate = "BETWEEN '2015-".$lastmonth."-16' AND '2015-$thismonth-15'";
    $query = ("SELECT unid FROM responses WHERE (date ".$thedate.")");

    $stmt =  $db->prepare( $query );
    $stmt->execute();

在Mysql查询中不执行PHP变量

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