PHP 脚本在刷新后执行

Question

我有一个按钮，单击后执行 php 代码（我正在使用电子邮件测试某些内容，到目前为止一切正常，除了“刷新后加载 PHP 脚本”问题）：

HTML：

<form method="post"> 

<input type="submit" name="button1"

        class="button" value="Button1" /> 

<input type="submit" name="button2"

        class="button" value="Button2" /> 

</form>

PHP：

<?php

    if(array_key_exists('button1', $_POST)) { 

        button1(); 

    } 

    else if(array_key_exists('button2', $_POST)) { 

        button2(); 

    } 

    function button1() { 

        echo "mail"; 

    } 

    function button2() {

            ini_set( 'display_errors', 1 );

            error_reporting( E_ALL );

            $from = "[e-mail]";

            $to = "[e-mail]";

            $subject = "Betreff";

            $message = "Text";

            $headers = "From:" . $from;

            mail($to,$subject,$message, $headers);

            echo "Test email sent";

    } 

?>

当我第一次访问该站点时，在我按下其中一个按钮之前，一切正常，并且脚本未执行。太完美了 -> 但是当我刷新页面时，脚本就会在我按下按钮的情况下执行。

如何防止刷新后加载脚本？

Answer 1

显示这种消息通常称为“闪现消息”：显示出现过一次的消息，刷新后不再显示。您的问题来自浏览器的行为：如果页面是从 POST 请求加载的，那么如果用户点击刷新按钮，它将发出具有相同 POST 参数的新 POST 请求但你想要的是：如果一个页面是从 POST 请求加载的，那么如果用户点击刷新按钮，它将发出一个新的 GET 请求（当然：没有任何 POST 参数）可以使用session来实现，步骤如下：用户单击按钮（1 或 2）POST 到自身按钮1=按钮1或按钮2=按钮2页面处理请求（做邮件功能）页面重定向/刷新以显示先前保存在会话变量中的新消息。<?php&nbsp; &nbsp; session_start();&nbsp; &nbsp; if(array_key_exists('button1', $_POST)) {&nbsp; &nbsp; &nbsp; &nbsp; button1();&nbsp; &nbsp; }&nbsp; &nbsp; else if(array_key_exists('button2', $_POST)) {&nbsp; &nbsp; &nbsp; &nbsp; button2();&nbsp; &nbsp; }&nbsp; &nbsp; function button1() {&nbsp; &nbsp; &nbsp; &nbsp; $_SESSION["msg"] = "mail";&nbsp; &nbsp; &nbsp; &nbsp; echo "<script>window.location = window.location.pathname;</script>";&nbsp; &nbsp; &nbsp; &nbsp; exit();&nbsp; &nbsp; }&nbsp; &nbsp; function button2() {&nbsp; &nbsp; &nbsp; &nbsp; ini_set( 'display_errors', 1 );&nbsp; &nbsp; &nbsp; &nbsp; error_reporting( E_ALL );&nbsp; &nbsp; &nbsp; &nbsp; $from = "[e-mail]";&nbsp; &nbsp; &nbsp; &nbsp; $to = "[e-mail]";&nbsp; &nbsp; &nbsp; &nbsp; $subject = "Betreff";&nbsp; &nbsp; &nbsp; &nbsp; $message = "Text";&nbsp; &nbsp; &nbsp; &nbsp; $headers = "From:" . $from;&nbsp; &nbsp; &nbsp; &nbsp; mail($to,$subject,$message, $headers);&nbsp; &nbsp; &nbsp; &nbsp; $_SESSION["msg"] = "Test email sent";&nbsp; &nbsp; &nbsp; &nbsp; echo "<script>window.location = window.location.pathname;</script>";&nbsp; &nbsp; &nbsp; &nbsp; exit();&nbsp; &nbsp; }?><form method="POST"><input type="submit" name="button1"&nbsp; &nbsp; &nbsp; &nbsp; class="button" value="Button1" /><input type="submit" name="button2"&nbsp; &nbsp; &nbsp; &nbsp; class="button" value="Button2" /></form><?phpif(!empty($_SESSION["msg"])){&nbsp; &nbsp; echo $_SESSION["msg"];&nbsp; &nbsp; $_SESSION["msg"] = null;&nbsp; &nbsp; unset($_SESSION["msg"]);}?>