php - 单击按钮后 $_SESSION 变量丢失

Question

我知道之前有人问过这个问题，但我似乎无法完成这项工作...我有一个带有多个文本框和一个按钮的 PHP 表单。

按钮将调用不同的函数，具体取决于早期声明的一个变量的值。我意识到在单击“继续”按钮后变量丢失了，所以我认为将它分配给 $_SESSION 变量可能会有所帮助。不!

根据要求，这是该页面的完整代码……目前是这样。请注意，我已经尝试了响应中建议的所有内容，即使它没有像现在这样包含在版本中!..

<?php 
require_once  ("Includes/connectDB.php");
session_start();
$pn = $_GET['q'];
$hideval = $pn;  //values are as expected here...(the calling form has checks in place to ensure valid number entered

$query = "SELECT * FROM customer WHERE Phone='$pn'";
$result = mysql_query($query);

if (!$result) die ("Database access failed: " . mysql_error());
$rows = mysql_num_rows($result);

$rowinfo = mysql_fetch_array($result);

$cphone = $pn;
if ($rows > 0)
{
    $clast = $rowinfo['LastName'];
    $cfirst = $rowinfo['FirstName'];
    $caddr1 = $rowinfo['Address1'];
    $caddr2 = $rowinfo['Address2'];
    $cpostal = $rowinfo['Postal'];
    $ccity = $rowinfo['City'];
    $cprov = $rowinfo['Province'];
    $cpay = $rowinfo['PayType'];
    $corder = $rowinfo['CustOrder'];
}
else
{
    $clast = '';
    $cfirst = '';
    $caddr1 = '';
    $caddr2 = '';
    $cpostal = '';
    $ccity = '';
    $cprov = 'ON';  
    $cpay = ''; 
    $corder = '';  
}

    function AddRecord()
{
    $clast = $_POST['CustLastName'];
    $cfirst = $_POST['CustFirstName'];
    $cphone = $_POST['CustPhone'];
    $caddr1 = $_POST['CustAddress1'];
    $caddr2 = $_POST['CustAddress2'];
    $ccity = $_POST['CustCity'];
    $cpostal = $_POST['CustPostal'];
    $cpay = $_POST['PayType'];
    $corder = $_POST['CustOrder'];

    if(! get_magic_quotes_gpc() )
    {
        $cphone = addslashes ($cphone);
        $clast = addslashes ($_POST['CustLastName']);
        $cfirst = addslashes ($_POST['CustFirstName']);
        $caddr1 = addslashes ($_POST['CustAddress1']);
        $caddr2 = addslashes ($_POST['CustAddress2']);
        $ccity = addcslashes($_POST['CustCity']);
        $cpostal = addcslashes($_POST['CustPostal']);
        $corder = addcslashes($_POST['CustOrder']);
    }
    else
    {
        $clast = ($_POST['CustLastName']);
        $cfirst = ($_POST['CustFirstName']);
        $caddr1 = ($_POST['CustAddress1']);
        $caddr2 = ($_POST['CustAddress2']);
        $ccity = ($_POST['CustCity']);
        $cpostal = ($_POST['CustPostal']); 
        $corder = $_POST['CustOrder'];
    }

    $query = "INSERT INTO customer (Phone, LastName, FirstName, Address1, Address2, City, Province, Postal, PayType, CustOrder) VALUES ('$cphone','$clast','$cfirst', '$caddr1', '$caddr2', '$City', '$Province', '$Postal', '$cpay', '$corder')";
    $result = mysql_query($query);
    if (!$result) die ("Database access failed: " . mysql_error());
}

function EditRecord()
{
    echo ('Im going to try an edit'); die;
    $clast = $_POST['CustLastName'];
    $cphone = $_POST['CustPhone'];
    $cfirst = $_POST['CustFirstName'];
    $caddr1 = $_POST['CustAddress1'];
    $caddr2 = $_POST['CustAddress2'];
    $ccity = $_POST['CustCity'];
    $cpostal = $_POST['CustPostal'];
    $cpay = $_POST['PayType'];
    $corder = $_POST['CustOrder'];

    if(! get_magic_quotes_gpc())
    {
        $clast = addslashes ($_POST['CustLastName']);
        $cfirst = addslashes ($_POST['CustFirstName']);
        $caddr1 = addslashes ($_POST['CustAddress1']);
        $caddr2 = addslashes ($_POST['CustAddress2']);
        $ccity = addcslashes($_POST['CustCity']);
        $cpostal = addcslashes($_POST['CustPostal']);
        $corder = addslashes($_POST['CustOrder']);
     }
     else
     {
        $clast = ($_POST['CustLastName']);
        $cfirst = ($_POST['CustFirstName']);
        $caddr1 = ($_POST['CustAddress1']);
        $caddr2 = ($_POST['CustAddress2']);
        $ccity = ($_POST['CustCity']);
        $cpostal = ($_POST['CustPostal']);
        $corder = $_POST['CustOrder'];
     }

     $query = "UPDATE customer SET Phone='$cphone', LastName='$clast', FirstName='$cfirst', Address1='$caddr1', Address2='$caddr2', City='$ccity', Province='$cprov', Postal='$cpostal', PayType='$cpay', CustOrder='$corder' WHERE Phone='$cphone'";
     $result = mysql_query($query);

     if (!$result) die ("Database access failed: " . mysql_error());
 }


?>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="styles/beer_delivery.css" />

</head>

<body>
<p></p>
<br><br>
<div id="mainPicture">
    <div class="picture">

    </div>
</div>
    <div class="contentBox">
    <div class="innerBox">
        <h1>Customer Information</h1>
        <div class="contentText">
            <p></p>
            <div id="main">
                <form action="customer_info.php" method="post">
                    <fieldset>
                        <legend>Customer</legend>
                            <label for="CustPhone">Phone:</label>

                            <input type="text" name="CustPhone" id="CustPhone" tabindex="2" value="<?php echo $cphone;  ?>">                  
                            <br>
                            <div id="divider"></div>

                          <p>&nbsp;</p>
                           <label for="CustLastName">Last Name:</label>
                           <input type="text" name="CustLastName" id="CustLastName" tabindex="2" value="<?php echo $clast;  ?>">
                           &nbsp;&nbsp;&nbsp;&nbsp;
                           <label for="CustFirstName">First Name:</label>
                           <input type="text" name="CustFirstName" id="CustFirstName" tabindex="3" value="<?php echo $cfirst;  ?>">

                           <p>&nbsp;</p>

                           <label for="CustAddress1">Address 1:</label>
                           <input type="text" name="CustAddress1" id="CustAddress1" tabindex="4" value="<?php echo $caddr1; ?>">

                            &nbsp;&nbsp;&nbsp;&nbsp;
                            <label for="CustAddress2">Address2:</label>
                            <input type="text" name="CustAddress2" id="CustAddress2" tabindex="5" value="<?php echo $caddr2; ?>">

                            <p>&nbsp;</p>

                            <label for="CustCity">City:</label>
                            <input type="text" name="CustCity" id="CustCity" tabindex="6" value="<?php echo $ccity; ?>">

                            <p>&nbsp;</p>

                            <label for="CustPostal">PostalCode</label>
                            <input type="text" name="CustPostal" id="CustPostal" tabindex="7" value="<?php echo $cpostal; ?>">

                            &nbsp;&nbsp;&nbsp;&nbsp;
                            <label for="CustProvince">Province:</label>
                            <input type="text" name="CustProvince" id="CustProvince" tabindex="8" value="<?php echo $cprov; ?>">

                            <p>&nbsp;</p>
                            <label for="CustOrder">Customer Order:</label>
                            <textarea name="CustOrder" rows="4" cols="50" tabindex="9"><?php echo $corder; ?></textarea>
                            <p>&nbsp;</p>

                            <label for="PayType">Method of Payment:</label>
                            <select name="PayType" id="PayType" tabindex="10">
                                <option value="Credit Card" <?php if ($cpay == 'Credit Card') echo ' selected="selected"';?>>Credit Card</option>
                                <option value="Debit" <?php if ($cpay == 'Debit') echo ' selected="selected"';?>>Debit</option>
                                <option value="Cheque" <?php if ($cpay == 'Cheque') echo ' selected="selected"';?>>Cheque</option>
                                <option value="Other"<?php if ($cpay == 'Other') echo ' selected="selected"'; ?>>Other</option>
                            </select> 

                            <p>&nbsp;</p>
                            &nbsp;&nbsp;&nbsp;&nbsp;

                           <form id="custform" method="post" action="<?php echo $_SERVER['PHP_SELF']."?".http_build_query($_GET); ?>">
                           <input type="submit" name="Continue" id="Continue" value="Continue" tabindex="11">

                            </form> 
                            <?php
                               //have also used session vars here...but same problem
                                echo $_GET['q']; //this shows the phone number
                                  if(isset($_POST['Continue']))
                                  {
                                      //ultimately, the functions AddRecord and EditRecord will be called in here ... once I get the variable problem fixed
                                      echo 'after click: '. $_GET['q'];  //this shows "after click: "
                                  }
                            ?>                    

                            <p>&nbsp;</p>
                       </fieldset>
                  </form>
            </div>   
        </div>
    </div>
</div>

</body>
</html>

Answer 1

这就是 MildlyInteresting 所说的。尝试替换

$hideval = $_GET['q']; 

与

if(!empty($_GET['q'])) {
    $hideval = $_GET['q'];
}