PHP經過session判斷防止表單重複提交實例,當用戶提交表單後,爲防止重複操做,經過session來判斷是否爲初次提交,不然讓他返回到以前表單頁面。javascript
當前表單頁面is_submit設爲0php
SESSION_START(); $_SESSION['is_submit'] = 0; <form id="reg" action="post.php" method="post"> <p>用戶名:<input type="text" class="input" name="username" id="user"></p> <p>密 碼:<input type="password" class="input" name="password" id="pass"></p> <p>E-mail:<input type="text" class="input" name="email" id="email"></p> <p><input type="submit" name="submit" class="btn" value="提交註冊"/></p> </form>
如果提交表單了,設當前'is_submit爲1,如果刷新post.php,那麼將執行else代碼java
SESSION_START(); if (isset($_POST['submit'])) { if ($_SESSION['is_submit'] == '0') { $_SESSION['is_submit'] = '1'; echo "代碼塊,要作的事,代碼...<a onclick='history.go(-1);' href='javascript:void(0)'>返回</a>"; } else { echo "請不用重複提交<a href='index.php'>PHP+SESSION防止表單重複提交</a>"; } }