Question

每当我使用浏览器后退按钮返回时，它都工作正常并将购物车存储在会话中。但是，当我使用重定向到index.php的锚标记回去时，会话丢失或创建了新数组。

 <?php
    session_start();
    include_once 'connectiondb.php';

    class dbcook {


    public function Display_book()
    {

        $connect=new DBCONNECT();
        $link=$connect->DBCONNECTION();
        $disq_qry="select * from tbbook";
        $dis_result=mysqli_query($link,$disq_qry);
        $i=1;
        $output[]='<form name=abc action=index.php method=POST >';
        $output[]="<table border=5>";
        while($dis_row=mysqli_fetch_row($dis_result))
        {
            $i++;
            if($i==2)
            {
                $output[]='<tr>';
                $i=0;
            }
            $output[]="<td>";
            $output[]="<img src=$dis_row[5] width=50 />";
            $output[]="</td>";
            $output[]='<td>';
            $output[]="Title:<a href=details.php?bid=$dis_row[0] >$dis_row[1]</a><br>";
            $output[]="Author:$dis_row[2]<br>";
            $output[]="Publisher:$dis_row[3]<br>";
            $output[]="Price:$dis_row[4]";
            $output[]="<input type=checkbox name=add[] value=$dis_row[0] />";
            $output[]='</td>';
            if($i==1)
            {
                $output[]='</tr>';

            }
        }
        $output[]='<tr>';
        $output[]='<td>';
        $output[]='<input type="submit" name="btnsubmit" value="Add" />';
        $output[]='</td>';
        $output[]='</tr>';
        $output[]='</table>';
        $output[]='</form>';
        echo join($output);
        if(isset($_POST["btnsubmit"]))
        {
          //  session_start();
            $add=$_POST["add"];
            foreach ($add as $value )
            {
              // if(isset($bid))

                   // $_SESSION["bid"]=$value;

             $bid[]=$value; 

            }
          $_SESSION["bid"]=$bid;
           //print_r($_SESSION["bid"]);
         header('location: bookcart.php?action=Add');
        //  echo$_SESSION["bid"];
        }
        }
    public function Cart_Add()
    {
        $connect=new DBCONNECT();
        $connect->DBCONNECTION();
        if(isset($_SESSION["cart"]))
            $cart=$_SESSION["cart"];
        if(isset($_SESSION["bid"]))
            $bid=$_SESSION["bid"];
        if(isset($_REQUEST["action"]))
            $action=$_REQUEST["action"];
        switch ($action)
        {
            case 'Add':

                  if(isset($cart))
                {
                    $cart=$bid; 
                   //echo"if work";
                }
                else
                {
                    $cart=$bid;
                 //   echo"else work";
                }

                break;   
        }
          $_SESSION["cart"]=$cart;
             // print_r($_SESSION["cart"]);

    }
    public function Cart_detail()
    {
       // session_start();
        $connect=new DBCONNECT();
        $link=$connect->DBCONNECTION();
        $totalamt=0;

        if(isset($_SESSION["cart"]))
        {
            if($_SESSION["cart"]!="")
            {

               $arraybid=$_SESSION["cart"];
               $d= implode(",",$arraybid);
                $items= explode(',',$d);
              //  echo $bid;
              foreach ($items as $item)
              {
                  $contents[$item]= isset($contents[$item])?$contents[$item]+1:1;
              }
              $out[]="<form name=abc action=bookcart.php?action=Update method=POST>";
              $out[]='<table border=2>';
              $out[]='<tr><th></th><th>Book Detail</th><th>Publisher</th><th>Price</th><th>Qty</th><th>Amount</th></tr>';
              foreach ($contents as $bid=>$qty)
              {
                $qry="select * from tbbook where bid in($bid)";
                $res=mysqli_query($link,$qry) or die('Query_Error');

                if($row= mysqli_fetch_row($res))
                {

                    $out[]='<tr>';
                    $out[]='<td>';
                    $out[]="<a href=bookcart.php?action=Delete>Delete</a>";
                    $out[]='</td>';
                    $out[]='<td>';
                    $out[]="$row[1] by $$row[2]";
                    $out[]='</td>';
                    $out[]='<td>';
                    $out[]="$row[3]";
                    $out[]='</td>';
                    $out[]='<td>';
                    $out[]="$row[4]";
                    $out[]='</td>';
                    $out[]='<td>';
                    $out[]="<input type=text name=qty$row[0] value=$qty placeholder=QTY/>";
                    $out[]='</td>';
                    $out[]='<td>';
                    $amt=$row[4]*$qty;
                    $out[]=$amt;
                    $out[]='</td>';
                   $totalamt+=$amt;

                    $out[]='</tr>';
                }
              }
              $out[]='<tr>';
              $out[]='<td>';
                $out[]="Totalamt:$totalamt";
                $out[]='</td>';
                $out[]='<td>';
                $out[]="<a href='index.php'>Go Back</a>";
                $out[]='</td>';
                $out[]='</tr>';
                $_SESSION["totalamt"]=$totalamt;
                $out[]='</table>';
                $out[]="<input type=submit name=btnsubmit value=Update />";
                $out[]='</form>';

                $out[]="<a href=pay.php>Pay Now</a>";

                echo join($out);

            }
            }
        }
    }
    ?>

运行此命令后，我无法在此会话中存储购物车。通过浏览器的后退按钮进行导航时，我能够存储购物车，但无法通过锚标记进行存储。

Answer 1

在index.php文件中是否有session_start()？

重定向到索引页面重新创建数组-Session Lost

1 个答案: