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javascript - 提交表单后 session 丢失 - php

转载 作者：行者123 更新时间：2023-11-30 16:21:10 25 4
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一切正常，除了在我提交数据后， session 数据消失了。我已经在页面顶部(在 useracc-test.php 中)开始了 session ，这是用户页面。在 upload.php 中，我不需要启动 session ，因为它已经在 useracc-test.php 页面中链接(需要)。如果我这样做，将session start放在upload.php中，它会提示error, session already started。我在互联网上到处浏览，我尝试的一切都不适合我。我意识到不同的问题需要不同的方法。有些人有同样的问题，但是每个问题的解决方法都不一样，我在网上看了各种案例。我坚持了好几天。真让我头疼。请帮助.tq。任何帮助将不胜感激。

下面是用户登录后的用户页面(useracc-test.php)

<?php
//useracc-test.php
//start session
session_start();
//error_reporting(E_ALL);
//ini_set("display_errors",1);
//run the db connection
require 'connect-test.php';
//run the upload images etc script
require 'upload.php';

//if true, execute below
if(isset($_POST['username'])){

    //define variable
    $userName = $_POST['username'];

    //fetch data from table users
    $query = "SELECT id, name, username, telno FROM users WHERE username = ?";
    $stmt = $conn->prepare($query);
    $stmt->bind_param('s', $userName);
    $stmt->execute();
    $res = $stmt->get_result(); 
    $row = $res->fetch_array();

    // place in session to echo in html later
    $_SESSION['id'] = $row['id'];
    $_SESSION['name'] = $row['name'];
    $_SESSION['username'] = $row['username'];
    $_SESSION['telno'] = $row['telno'];

//*******************************************************   

 //create session for id field
  $id=($_SESSION['id']);

  //joined table- fetch all rows based on same id in child table useradvert  
 $query="SELECT ua.* FROM useradvert ua INNER JOIN users u ON  ua.id =u.id
 WHERE ua.id='".$id."'";

    $stmt = $conn->prepare($query); 
    $stmt->execute();
    $res2 = $stmt->get_result(); 
}

?>

<html>
<head>
<script type="text/javascript">
function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}
</script>
</head>
<body>
<div id="apDiv3">
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p><span class="TabbedPanelsContent">

  <?php
  //display record from table- users (parent table)
    echo $_SESSION['id']."<br/>";
    echo $_SESSION['name']."<br/>";
    echo $_SESSION['username']."<br/>";
    echo $_SESSION['telno']."<br/>";
?>
</p>

<p>&nbsp;</p>
<form name="form2" 
      action="useracc-test.php" method="post" enctype="multipart/form-data">
  <p>&nbsp;</p>
  <table width="500" border="0">
    <tr>
      <td>category</td>
      <td><select name="jumpMenu" id="jumpMenu" onChange="MM_jumpMenu('parent',this,0)">
        <option value="useracc-test.php" selected>Category</option>
        <option value="useracc-test.php">Members</option>
        <option value="useracc-test2-jumpmenu.php">Non-members</option>
      </select></td>
    </tr>
    <tr>
      <td>ID:</td>
      <td><input name="id" type="text" id="id" value="<?php echo $_SESSION['id']; ?>" ></td>
    </tr>
    <tr>
      <td>Name:</td>
      <td><input type="text" name="name2" id="name2"></td>
    </tr>
    <tr>
      <td>Color</td>
      <td><input type="text" name="color2" id="color2"></td>
    </tr>
    <tr>
      <td>Hobby</td>
      <td><input type="text" name="hobby2" id="hobby2"></td>
    </tr>
    <tr>
      <td>Sex</td>
      <td>male
        <input type="radio" name="radiobtn" id="radio" value="male">
        female
        <input type="radio" name="radiobtn" id="radio2" value="female"></td>
    </tr>
    <tr>
      <td>Image</td>
      <td><input type="file" name="image" id="image"></td>
    </tr>
    <tr>
      <td>Image2</td>
      <td><input type="file" name="image2" id="image2"></td>
    </tr>

    <tr>
      <td>&nbsp;</td>
      <td><input type="submit" name="submit" id="submit" value="submit"></td>
    </tr>
  </table>
  <div align="center"></div>
  <p>&nbsp;</p>
</form>
<p>&nbsp;</p>
<p>


<ul>
  <?php
if (isset($res2)){
while ($row2 = $res2->fetch_array(MYSQLI_ASSOC)){
    echo "<li>".$_SESSION['name2'] = $row2['name2'];
    echo $_SESSION['color2'] = $row2['color2'];
    echo $_SESSION['hobby2'] = $row2['hobby2'];
    echo $_SESSION['radiobtn'] = $row2['radiobtn'];
    echo $_SESSION['kupon'] = $row2['kupon'];
    echo  $_SESSION['image'] = $row2['image'];
    echo $_SESSION['image2'] = $row2['image2'];}
}
?>
</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>
</body>
</html>

当我按下提交时下面这部分消失

 $id = isset($_POST['id']);
    $name2 = isset($_POST['name2']);
    $color2 = isset($_POST['color2']);
    $hobby2 = isset($_POST['hobby2']);
    $radiobtn = isset($_POST['radiobtn']);
    $image = isset($_FILES['image']);
    $image2 = isset($_FILES['image2']);

下面是运行上传脚本的upload.php页面。

<?php
//echo var_dump($_POST);
//echo var_dump($_FILES);
require 'connect-test.php';
if(isset($_POST["submit"])) {
    //define variable 
   $id = $_POST['id'];
$name2 = $_POST['name2'];
$color2 = $_POST['color2'];
$hobby2 = $_POST['hobby2'];
$radiobtn = $_POST['radiobtn'];
$image = $_FILES['image'];
$image2 = $_FILES['image2'];
    //target file for image
    $target_dir = "uploads/";
    $target_file = $target_dir . basename($_FILES["image"]["name"]);
    $uploadOk = 1;
    $imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
//target file2 for image2
    $target_dir = "uploads/";
$target_file2 = $target_dir . basename($_FILES["image2"]["name"]);
$uploadOk = 1;
$imageFileType2 = pathinfo($target_file2,PATHINFO_EXTENSION);
//script for targetfile -image
    // Check if image or not        
    $check = getimagesize($_FILES["image"]["tmp_name"]);
    if($check !== false) {
        echo "File is an image - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "File is not an image.";
        $uploadOk = 0;
    }
// Check if file already exists
if (file_exists($target_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}
// Check file size
if ($_FILES["image"]["size"] > 500000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
    echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    $uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["image"]["tmp_name"], $target_file)) {
        echo "The file ". basename( $_FILES["image"]["name"]). " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
}
//script for targetfile2 -image2
    // Check if image or not        
    $check2 = getimagesize($_FILES["image2"]["tmp_name"]);
    if($check2 !== false) {
        echo "File is an image - " . $check2["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "File is not an image.";
        $uploadOk = 0;
    }
// Check if file already exists
if (file_exists($target_file2)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}
// Check file size
if ($_FILES["image2"]["size"] > 500000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}
// Allow certain file formats
if($imageFileType2 != "jpg" && $imageFileType2 != "png" && $imageFileType2 != "jpeg"
&& $imageFileType2 != "gif" ) {
    echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    $uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["image2"]["tmp_name"], $target_file2)) {
        echo "The file ". basename( $_FILES["image2"]["name"]). " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
}
//insert record
    $stmt = $conn->prepare("INSERT INTO useradvert (id,name2,color2,hobby2,radiobtn,image,image2) VALUES (?,?,?,?,?,?,?)");
    $stmt->bind_param("issssss",$id,$name2,$color2,$hobby2,$radiobtn,$target_file,$target_file2);
    $stmt->execute();
}
?>

最佳答案

$id=($_SESSION['id']);

我不确定你为什么要这样写代码。在变量 force 周围加上括号以返回值 vs 引用，但它只对 return 语句很重要，即 return $var vs return ($var)

<?php
$q=1 ;
$r=$q;
$q=2;
echo $r, "\n"; // prints 1
$t =&$q ;
$q=3;
echo $t, "\n"; // prints 3

其次，我猜你的意思是该值从你的数据库中消失了？因为你这样做

$stmt = $conn->prepare("INSERT INTO useradvert (id,name2,color2,hobby2,radiobtn,image,image2) VALUES (?,?,?,?,?,?,?)");
$stmt->bind_param("issssss",$id,$name2,$color2,$hobby2,$radiobtn,$target_file,$target_file2);

但是您上面的代码执行以下操作

$id = isset($_POST['id']);
$name2 = isset($_POST['name2']);
$color2 = isset($_POST['color2']);
$hobby2 = isset($_POST['hobby2']);
$radiobtn = isset($_POST['radiobtn']);
$image = isset($_FILES['image']);
$image2 = isset($_FILES['image2']);

isset() 将返回 true 或 false，而不是值。因此，当您最终使用 bind_param() 时，您使用 true/false 与值进行绑定(bind)你应该更好地做到这一点

$id = isset($_POST['id']) ? $_POST['id'] : <a default value> ;
etc...

最后“在 upload.php 中，我不需要启动 session ，因为它已经在 useracc-test.php 页面中链接(要求)了。”:只有当你没有调用它时，这才是正确的直接编写脚本。

对于 ml2_1jzsinglecam这是一个link to the code我曾经测试过

关于javascript - 提交表单后 session 丢失 - php，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34719378/

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