表单
表单提交
form.html
<html> <head> <meta charset="utf-8"> <title>表单提交测试</title> </head> <body> <form action="form_action.php" method="post"> 名字: <input type="text" name="fname"> 年龄: <input type="text" name="age"> <input type="submit" value="提交"> </form> </body> </html>
form_action.php
姓名: <?php echo $_POST["fname"]; ?>!<br> 年龄: <?php echo $_POST["age"]; ?>
下拉框&选择狂
<?php //获取get请求方式的参数,不能获取多选框的数组 //$q = isset($_GET['q'])? htmlspecialchars($_GET['q']) : ''; //获取post请求方式的参数,多选只能用这种 $q = isset($_POST['q'])? $_POST['q'] : ''; if(is_array($q)) { //多选 $sites = array( 'apple' => '苹果', 'banana' => '香蕉', 'orange' => '橘子', ); foreach ($q as $val) { // PHP_EOL 为常量，用于换行 echo $sites[$val] . PHP_EOL; } } elseif ($q) { //单选 if($q =='apple') { echo '选择了苹果<br>'; } else if($q =='banana') { echo '选择了香蕉<br>'; } else if($q =='orange') { echo '选择了橘子<br>'; } } else { ?> <!--下拉单选--> <form action="" method="post"> <select name="q"> <option value="">请选择:</option> <option value="apple">苹果</option> <option value="banana">香蕉</option> <option value="orange">橘子</option> </select> <input type="submit" value="提交"> </form> <!--下拉多选--> <form action="" method="post"> <select multiple="multiple" name="q[]> <option value="">请选择:</option> <option value="apple">苹果</option> <option value="banana">香蕉</option> <option value="orange">橘子</option> </select> <input type="submit" value="提交"> </form> <!--radio单选--> <form action="" method="post"> 请选择: <input type="radio" name="q" value="apple"/>苹果 <input type="radio" name="q" value="banana"/>香蕉 <input type="radio" name="q" value="orange"/>橘子 <input type="submit" value="提交"> </form> <!--checkbox单选--> <form action="" method="post"> 请选择: <input type="checkbox" name="q[]" value="apple"/>苹果 <input type="checkbox" name="q[]" value="banana"/>香蕉 <input type="checkbox" name="q[]" value="orange"/>橘子 <input type="submit" value="提交"> </form> <?php } ?>
表单数据验证
必填验证、数据格式验证、
<?php // 定义变量并默认设置为空值 $nameErr = $emailErr = $genderErr = $websiteErr = ""; $name = $email = $gender = $comment = $website = ""; if ($_SERVER["REQUEST_METHOD"] == "POST") { if (empty($_POST["name"])) { $nameErr = "Name is required"; } else { $name = test_input($_POST["name"]); // 检测名字是否只包含字母跟空格 if (!preg_match("/^[a-zA-Z ]*$/",$name)) { $nameErr = "只允许字母和空格"; } } if (empty($_POST["email"])) { $emailErr = "Email is required"; } else { $email = test_input($_POST["email"]); // 检测邮箱是否合法 if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) { $emailErr = "非法邮箱格式"; } } if (empty($_POST["website"])) { $website = ""; } else { $website = test_input($_POST["website"]); // 检测 URL 地址是否合法 if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) { $websiteErr = "非法的 URL 的地址"; } } if (empty($_POST["comment"])) { $comment = ""; } else { $comment = test_input($_POST["comment"]); } if (empty($_POST["gender"])) { $genderErr = "性别是必需的"; } else { $gender = test_input($_POST["gender"]); } } //校验数据方法 function test_input($data) { $data = trim($data); $data = stripslashes($data); $data = htmlspecialchars($data); return $data; } ?> <h2>PHP 表单验证</h2> <!--$_SERVER["PHP_SELF"]为本身路径,htmlspecialchars为了防止跨域攻击--> <form method="post" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']);?>"> 名字: <input type="text" name="name"> <span class="error" style="color: #FF0000;">* <?php echo $nameErr;?></span> <br><br> E-mail: <input type="text" name="email"> <span class="error" style="color: #FF0000;">* <?php echo $emailErr;?></span> <br><br> 网址: <input type="text" name="website"> <span class="error" style="color: #FF0000;"><?php echo $websiteErr;?></span> <br><br> 备注: <textarea name="comment" rows="5" cols="40"></textarea> <br><br> 性别: <input type="radio" name="gender" value="female">女 <input type="radio" name="gender" value="male">男 <span class="error" style="color: #FF0000;">* <?php echo $genderErr;?></span> <br><br> <input type="submit" name="submit" value="Submit"> </form> <?php echo "<h2>您输入的内容是:</h2>"; echo $name; echo "<br>"; echo $email; echo "<br>"; echo $website; echo "<br>"; echo $comment; echo "<br>"; echo $gender; ?> </body>
$_REQUEST 变量
预定义的 $_REQUEST 变量包含了 $_GET、$_POST 和 $_COOKIE 的内容。
$_REQUEST 变量可用来收集通过 GET 和 POST 方法发送的表单数据,如果不确定是get还是post请求可以用$_REQUEST获取参数。
