页面未正确重定向

Question

我已经设置了重定向，但这里的代码不起作用：

if($result){

$sql_result = mysql_query("SELECT * FROM  `application` ORDER BY  `application`.`app_id`   
DESC LIMIT 0, 1");
$row = mysql_fetch_assoc($sql_result); 
echo $row['app_id'];
echo $app_id;
header('Location: payment.php?id=$row['app_id']');
exit();
}

页面没有重定向，只是返回一个空白页面。有任何想法吗？ 感谢。

Answer 1

尝试

header('Location: payment.php?id='.$row['app_id']);

Answer 2

试试这样：

header("Location: payment.php?id=".$row['app_id']);

Answer 3

尝试用

替换最后一行

header('Location: payment.php?id='.$row['app_id']);
exit();

Answer 4

    if($result){

    $sql_result = mysql_query("SELECT * FROM  `application` ORDER BY  `application`.`app_id`   
    DESC LIMIT 0, 1");
    $row = mysql_fetch_assoc($sql_result); 
    echo $row['app_id'];
    echo $app_id;
   ?>
  <script> 
   window.location=payment.php?id=<?php echo $row['app_id'];?>
  </script>
   <?php
    exit();
    }
?>