doushouhe7072
2015-08-13 12:33
浏览 35
已采纳

PHP echo重定向

I want to echo something in a post after submitting a form, then redirecting the header to cancel the double submit problem. Currently, Output_buffering turned on to allow the redirect to work. here some example code that illustrates the problem. Just make sure Output_buffering is on in php.ini.

<?php
   if(isset($_POST['submit'])){
   echo "hi";
}

   if (count($_POST) {
    header("Location: ".$_SERVER['REQUEST_URI']);
    exit();
    }
?>

<form action="<?php echo htmlentities($_SERVER['REQUEST_URI']); ?>" method="POST" name="edit" >
    <button type="submit" value="submit" name="submit">edit</button>
</form>
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2条回答 默认 最新

  • douyun8885 2015-08-13 12:50
    已采纳

    You should reverse the order.

    On submit:

    1. Process yours submit form.
    2. Push desired output message into yours session.
    3. Redirect to whatever/message page.

    On message page show:

    1. Retrive message, pushed to session.
    2. Cleanup session record.
    3. Display message.

    It's can be separate page, same page, as with submit for, or any other page.

    Or... Do the work with JavaScript and AJAX:

    <?php
        if(isset($_POST['submit'])) {
            ...
            if (/all is ok/)
                die(json_encode(array('status' => 'ok', 'message' => 'Hi!')));
            else {
                die(json_encode(array('status' => 'err', 'message' => 'I\'m failed!')));
            }
        }
    ?>
    
    <form action="<?php echo htmlentities($_SERVER['REQUEST_URI']); ?>" method="POST" name="edit" >
        <button type="submit" value="submit" name="submit">edit</button>
    </form>
    <script language="javascript">
      $('form').submit(function() {
          var parameters = ...; // collect parameters from form
          $.getJSON('/url-to-script', parameters)
           .success(function(response) {
               if (response.message == "ok")
                   alert(response.message);
               else
                   alert('Can\'t process input:
    ' + response.message);
           })
           .error(function(response) {
               alert('What a terrible failure!');
           });
      });
    </script>
    

    When .success() fired - you can show supplied message to user via alert/custom modal message box an then make redirect (document.location = '<?php echo ... ?>') or replace form on page with some custom message and link/button to proceed... Lots of variants.

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  • duanchuopi2298 2015-08-13 13:29

    Headers must be sent BEFORE any content (that's what echo gives).

    You could store your message into session and print it on next request (which would be your follow up redirect).

    EXAMPLE:

    sessions_init.php

    <?php 
    session_start();
    

    post.php

    <?php
    include_once 'sessions_init.php';
    // assuming POST succeeded, data is valid, etc
    $_SESSION['messages'][] = 'You have been redirected';
    
    header("Location: ".$_SERVER['REQUEST_URI']);
    exit();
    

    html template:

    include_once 'sessions_init.php';
    // print HTML:
    // <html><head>...</head><body>...
    
    foreach($_SESSION['messages'] as $message) {
       print($message);
    }
    
    // some other content </body></html>
    
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