我已经在多表单页面上工作了一段时间。我需要一些帮助来尝试理解为什么当我取消设置变量时，多表单页面无法正常工作。我在代码中放置了一条 echo 语句来跟踪变量值，甚至在页面刷新后变量仍然保留。从字面上看，我必须删除该站点的 cookie 才能取消设置该变量。这是代码：<?phpsession_start();// Start the sessionecho $_SESSION["formatPickleball"];$_SESSION["Pickleball"] = "";// Submit button is pressedif (isset($_POST['format1'])){ $_SESSION["formatPickleball"] = $_POST['member']; $_SESSION["Pickleball"] = "hide";}if ($_SESSION["formatPickleball"] == "Captain") {$regCAP = "";// Submit button is pressedif (isset($_POST['submitCAP'])){$regCAP = "show";}$secondCAP = "";// Submit button is pressedif (isset($_POST['submit2'])){$secondCAP = "show";}$thirdCAP = "";// Submit button is pressedif (isset($_POST['submit3'])){$thirdCAP = "show";}} elseif ($_SESSION["formatPickleball"] == "Player") {$regPlay = "";// Submit button is pressedif (isset($_POST['submitPlay'])){$regPlay = "show";} }?><html><script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script><link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/themes/smoothness/jquery-ui.css"><script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/chosen/1.8.7/chosen.jquery.min.js"></script><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/chosen/1.8.7/chosen.min.css"> <script type="text/javascript"></script><body><div id="mainForm"> <h4>Are you a Captain or a Player on a Team?</h4><form method='POST'> <input type="radio" name="member" value="Captain">Captain <input type="radio" name="member" value="Player">Player<br> <input type="submit" name="format1" value="Select"> </form></div>当我添加 $_SESSION["formatPickleball"] = ""; 到php代码的顶部，多表单无法正常工作。我有两个问题 1) 如何在不删除 cookie 的情况下取消设置变量？2）这是用 PHP 编写此代码的最有效方法吗？
3 回答
千万里不及你
TA贡献1784条经验 获得超9个赞
存储在会话中的值必须在脚本执行结束时被丢弃。
销毁
$_SESSION使用unset($ _ SESSION)和然后使用销毁会话本身
session_destroy();
不负相思意
TA贡献1777条经验 获得超10个赞
一旦 if 语句完成，我就可以通过使用窗口弹出窗口来清除变量。
if ($Num_CTeams > 1 && $_SESSION["Pickleball"] !="") {
echo '<script language="javascript">';
echo 'alert("Sorry, Captains can only captain up to two teams ONLY.")';
echo '</script>';
$_SESSION["formatPickleball"] = "";
}
素胚勾勒不出你
TA贡献1827条经验 获得超9个赞
<?php
session_start();
echo $_SESSION["formatPickleball"];
$_SESSION["Pickleball"] = "";
if (isset($_POST['format1']) && $_POST['format1'] && isset($_POST['member']) && $_POST['member']) {
$_SESSION["formatPickleball"] = $_POST['member'];
$_SESSION["Pickleball"] = "hide";
}
if ($_SESSION["formatPickleball"] == "Captain") {
$regCAP = isset($_POST['submitCAP']) && $_POST['submitCAP'] ? "show": "";
$secondCAP = isset($_POST['submit2']) && $_POST['submit2'] ? "show": "";
$thirdCAP = isset($_POST['submit3']) && $_POST['submit3'] ? "show": "";
}
if ($_SESSION["formatPickleball"] == "Player") {
$regPlay = isset($_POST['submitPlay']) && $_POST['submitPlay'] ? "show" : "";
}
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