Question

我创建了一个处理重复数据的函数，如果存在重复，它将显示错误消息，该错误消息在save11.func.php中声明为

$sql_section = mysqli_query($conn,"select *,COUNT(*) as count from schedule 
    natural join section 
    natural join strand
    natural join time 
    where strand ='$strand' and section ='$section' and schedule.timeID = '$daym' 
    and day ='m' and grade = 'Grade 12'") 
or die(mysqli_error($conn));
$row = mysqli_fetch_array($sql_section);
$count_s = $row['count'];
$times=date("h:i a",strtotime($row['time_start']))."-".date("h:i a",strtotime($row['time_end']));
$sections = $row['section'];
$strands = $row['strand'];

$error_s = "<span class='text-danger'> 
<table width='100%'>
    <tr>    
        <td>monday</td> 
        <td>$times</td> 
        <td>$sections</td>
        <td>$strands</td>
        <td class='text-danger'><b>Not Available</b></td>                   
    </tr>
    </span>
</table>";

它在如下文件中回显：

if (($count_t == 0) and ($count_r == 0) and ($count_s == 0)) {
    mysqli_query($conn,"INSERT into schedule (timeID, subject, instructorID, day, room, strand, section, grade) VALUES 
    ('$daym','$subject','$ins', 'm','$room', '$strand', '$section', 'Grade 12')");  

    echo "<span class='text-success'>
    <table width='100%'>
        <tr>
            <td>monday</td>
            <td>$time_t</td> 

            <td>Success</td>                    
        </tr>
    </table></span><br>";
}
    else if ($count_t>0) echo $error_t."<br>";
    else if ($count_r>0) echo $error_r."<br>";
    else {echo $error_c."<br>";}
}

但是我想在自己的schedules.php中回显错误消息，以便用户不必回头，如果输入被接受，他们将停留在同一页面上并输入其他数据。 >

header("Location:../pages/scheduling.php");

是的，可以将我重定向到用户将输入的页面，但不会显示在另一个文件中声明的错误消息。

Answer 1

是对的，您想在显示错误消息的另一页上显示错误消息吗？

一种解决方案是使用会话。因此，当错误消息生成时，您可以将其放在这样的会话中：

#include <boost/operators.hpp>

class C : private boost::arithmetic<C>
//                ^^^^^^^^^^^^^^^^^^^^
//                where the magic happens (Barton-Nackmann trick)
{
   int m_value ;

   public:
     C(int value): m_value(value) {} ;

     C& operator+=(const C& rhs) { m_value += rhs.m_value; return *this; }
     C& operator-=(const C& rhs) { m_value -= rhs.m_value; return *this; }
     C& operator*=(const C& rhs) { m_value *= rhs.m_value; return *this; }
     C& operator/=(const C& rhs) { m_value /= rhs.m_value; return *this; }
     const C& operator+() const { return *this; }
     C operator-() const { return {-m_value}; }

     int get_value() { return m_value; } ;
};

然后在另一页上：

session_start();
$_SESSION["defineYourNameHere"] = $error

执行此操作时，$ errorstring为空白，或者包含要显示的错误。

session_start(); $errorString = ""; if(isset($_SESSION["theNameOfTheSessionVariable"]) { $errorString = $_SESSION["theNameOfTheSessionVariable"] }会检查您放置在其中的变量是否存在，以防止出现未定义变量的错误。

从另一个文件在网站中回显错误消息

1 个答案: