如何从外部 javascript 中的 php 访问会话变量

Question

我知道之前有人问过这个问题，但是从头到尾都没有解释。我有一个 login.php，我想从中得到 $_SESSION['user_id']

来自

<?php
include "connect.php";

session_start();

$email=$_POST['email'];
$password=$_POST['password'];

$select_data=mysql_query("select * from user where email='$email' and password='$password'");

if(isset($_POST['email']))
{
if($row=mysql_fetch_array($select_data))
 {
  $_SESSION['user_id']=$row['id']; //The variable want to access from ext.js

  echo "success";
 }
 else
 {
  echo "fail";
 }
 exit();
}
?>

顺便说一句，这个认证工作正常

我的Main.php


<!DOCTYPE html>
<?php include 'connect.php';
session_start();
echo $_SESSION['user_id']; //works fine
//;
?>
<body>
//contents
<script src="login.js"></script>
<script src="postad.js"></script> //the script from which I want to get $SESSION_['user_id']

</body>

我希望此变量稍后插入到数据库中。有什么建议吗？

Answer 1

您可以将会话 ID 值分配给 JavaScript 变量，使其可用于 JavaScript:

<!DOCTYPE html>
<?php include 'connect.php';
session_start();
echo $_SESSION['user_id']; //works fine
//;
?>
<body>
//contents
<script>
    var sessionId = "<?php echo $_SESSION['user_id'] ?>";
</script>
<script src="login.js"></script>
<script src="postad.js"></script> // "sessionId" variable should be available for the script
</body>

Answer 2

如果你想在外部 js 文件中调用 php 变量，那么你必须在输入中存储值。

Main.php

<body>
<input type="hidden" value="$SESSION_['user_id']" class="user_id">
<script src="login.js"></script>
<script src="postad.js"></script> //the script from which I want to get $SESSION_['user_id']

</body>

postad.js

$(function(){
    var user_id = $('.user_id').val();
    alert(user_id);
});

如果你想在同一个文件中使用，那么你可以直接使用 php echo.

Main.php

<body>
    //content..

<script>
    var user_id = "<?php echo $SESSION_['user_id'] ?>";
</script>
<script src="login.js"></script>
<script src="postad.js"></script> // console.log(user_id); that file you'll get that id.
</body>

如何从外部 javascript 中的 php 访问会话变量

How do I access session variable from php in external javascript

html

javascript

php

json

session-variables