表单提交后，PHP会话数据清除

Question

I'm storing session data in $relnum variable, as shown below:

if (!isset($_SESSION)) {
    session_start();
    $_SESSION['releasen'] =$_POST['release_no'];
    $relnum=  $_SESSION['releasen']; 
}

And displaying it in form text field, as shown below;

<input name="relnu" id="relnu" type="text" value="<?php if ($rel==''){ echo $relnum;} else echo $rel; ?>" readonly="true"/>

I am submitting above Form data in mysql, as shown below;

if (isset($_POST['submitM']))  {
    $faultd=$_POST['faultdistribution'];
    $faultdes=$_POST['faultdescription'];
    $faultsev=$_POST['faultseverity'];
    $faultt=$_POST['faulttype'];
    $faultn=$_POST['faultcmnt'];
    $rel=$_POST['relnu'];
    $query = mysql_query("INSERT INTO `fault` (`fault-cmnt`,`fault-type`, `release_no`, `fault-discription`, `fault-severity`, `fault-distribution`) VALUES ('$faultn','$faultt', '$rel', '$faultd', '$faultsev', '$faultdes')")
        or die(mysql_error());
    echo "Data Added sucessfully";
}

The data is successfully submitted, but after that $relnum variable displays nothing. I am unable to comprehend what is the reason, as i am storing the data in session.

P.S: I am not using unset.

Please help, what i am missing?

Answer 1

You have no need to post the session data in the form, else your code seems fine. You can do it easy way with posting it in form like below:

if (isset($_POST['submitM']))  {
    session_start();
    $faultd=$_POST['faultdistribution'];
    $faultdes=$_POST['faultdescription'];
    $faultsev=$_POST['faultseverity'];
    $faultt=$_POST['faulttype'];
    $faultn=$_POST['faultcmnt'];
    $rel=$_SESSION['releasen'];
    $query = mysql_query("INSERT INTO `fault` (`fault-cmnt`,`fault-type`, `release_no`, `fault-discription`, `fault-severity`, `fault-distribution`) VALUES ('$faultn','$faultt', '$rel', '$faultd', '$faultsev', '$faultdes')")
        or die(mysql_error());
    echo "Data Added sucessfully";
}

it will work fine, please test it.

Thank you