技术专区 \ PHP

【PHP 零基础入门教程】第二章 PHP表单 (2-5PHP 完整表单实例)

Input Checked属性 ⋅ 2017-05-22 10:38:55

PHP 完整表单实例

 

PHP—完整表单实例:

<!DOCTYPE HTML>
 <html>
 <head>
     <meta charset="utf-8">
     <title>PHP中文网(runoob.com)</title>
     <style>
         .error {color: #FF0000;}
     </style>
 </head>
 <body>
 <?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 = "名字是必需的";
     }
     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 = "邮箱是必需的";
     }
     else
     {
         $email = test_input($_POST["email"]);
         // 检测邮箱是否合法
         if (!preg_match("/^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/",$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"]);
     }
 }
 
 function test_input($data)
 {
     $data = trim($data);
     $data = stripslashes($data);
     $data = htmlspecialchars($data);
     return $data;
 }
 ?>
 
 <h2>PHP 表单验证实例</h2>
 <p><span class="error">* 必需字段。</span></p>
 <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
     名字: <input type="text" name="name" value="<?php echo $name;?>">
     <span class="error">* <?php echo $nameErr;?></span>
     <br><br>
     E-mail: <input type="text" name="email" value="<?php echo $email;?>">
     <span class="error">* <?php echo $emailErr;?></span>
     <br><br>
     网址: <input type="text" name="website" value="<?php echo $website;?>">
     <span class="error"><?php echo $websiteErr;?></span>
     <br><br>
     备注: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>
     <br><br>
     性别:
     <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?>  value="female">女
     <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?>  value="male">男
     <span class="error">* <?php echo $genderErr;?></span>
     <br><br>
     <input type="submit" name="submit" value="提交">
 </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>
 </html>

程序运行结果:

PHP—在表单中确保输入值:

  在用户点击提交按钮后,为确保字段值是否输入正确,我们在HTML的input元素中插添加PHP脚本,各字段名为name, email,和website。在备注中的textarea字段中,我们将脚本放于<textarea>和</textarea>标签之间。PHP脚本输出值为:$name,$email,$website,和$comment变量。然后,我们同样需要检查被选中的单选按钮,对于这一点,我们必须设置好checked属性(不是radio按钮的value属性)。

<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
名字: <input type="text" name="name" value="<?php echo $name;?>">
   <span class="error">* <?php echo $nameErr;?></span>
<br><br>
E-mail: <input type="text" name="email" value="<?php echo $email;?>">
<span class="error">* <?php echo $emailErr;?></span>
<br><br>
网址: <input type="text" name="website" value="<?php echo $website;?>">
<span class="error"><?php echo $websiteErr;?></span>
<br><br>
备注: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>
<br><br>
性别:
<input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?>  value="female">女
<input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?>  value="male">男
<span class="error">* <?php echo $genderErr;?></span>
<br><br>
<input type="submit" name="submit" value="Submit">
</form>