Question

第一个例子是：

HTTP GET请求加载页面。
HTTP POST请求提交表单。
表格的数据存储在会话中。
HTTP GET请求加载页面。

第二个例子是goto使用＆＃34; reflow＆＃34;缓冲区，避免额外的HTTP请求。

HTTP GET请求加载页面。
HTTPPOST请求提交表单。
冲洗缓冲液＆amp;显示内容。

此外，最后一个示例不使用会话。

301

<!DOCTYPE html>
<html>
<head>
    <!-- ow noez! -->
</head>
<body>  
    <?php
    // A very common scenario in user-flow handling is redirecting user to the page itself after submitting form, e.g.

    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
        if (isset($_POST['a'])) {
            // Suppose there was an error & I've populated the error in $_SESSION.
            // Now I would redirect user back to the form. This is because there
            // is markup in the upper template hierarchy layer, e.g. "<!-- ow noez! -->"

            header('Location: ' . $_SERVER['REQUEST_URI']);

            exit;
        }
    }
    ?>

    <form action="" method="post">
        <?php if (isset($time)):?>
        <pre>This value is from the past: <?=$time?></pre>
        <?php endif;?>
        <pre>Next time: <?php $time = time(); echo $time;?></pre>

        <input type="submit" name="a" value="back in time!">
    </form>
</body>
</html>

转到

<?php
goback:

ob_start();
?>
<!DOCTYPE html>
<html>
<head>
    <!-- ow noez! -->
</head>
<body>  
    <form action="" method="post">
        <?php if (isset($time)):?>
        <pre>This value is from the past: <?=$time?></pre>
        <?php endif;?>
        <pre>Next time: <?php $time = time(); echo $time;?></pre>

        <input type="submit" name="a" value="back in time!">
    </form>

    <?php
    // A very common scenario in user-flow handling is redirecting user to the page itself after submitting form, e.g.

    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
        if (isset($_POST['a'])) {
            ob_clean();

            $_POST = [];
            $_SERVER['REQUEST_METHOD'] = 'GET';

            goto goback;
        }
    }
    ?>
</body>
</html>

goto方案是否不优于 301 ？

Answer 1

xkcd
＆GT; xkcd

您是否考虑过使用AJAX？那你的流程是：

HTTP GET获取网页
HTTP POST通过AJAX提交数据
完成！（可选）使用JavaScript更新当前视图。

或者，您可以保留当前代码，只需将整个if($_SERVER['REQUEST_METHOD'] === "POST")部分移到goto标签所在的位置即可。换句话说，重组程序的流程;）

使用goto处理输入

1 个答案: