PHP 表单验证实例

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1. <?php
   
2. // 定义变量并默认设置为空值
   
3. $nameErr = $emailErr = $genderErr = $websiteErr = "";
   
4. $name = $email = $gender = $comment = $website = "";
   
5. 
   
6. if ($_SERVER["REQUEST_METHOD"] == "POST")
   
7. {
   
8.     if (empty($_POST["name"]))
   
9.     {
   
10.         $nameErr = "名字是必需的";
    
11.     }
    
12.     else
    
13.     {
    
14.         $name = test_input($_POST["name"]);
    
15.         // 检测名字是否只包含字母跟空格
    
16.         if (!preg_match("/^[a-zA-Z ]*$/",$name))
    
17.         {
    
18.             $nameErr = "只允许字母和空格";
    
19.         }
    
20.     }
    
21.    
    
22.     if (empty($_POST["email"]))
    
23.     {
    
24.       $emailErr = "邮箱是必需的";
    
25.     }
    
26.     else
    
27.     {
    
28.         $email = test_input($_POST["email"]);
    
29.         // 检测邮箱是否合法
    
30.         if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))
    
31.         {
    
32.             $emailErr = "非法邮箱格式";
    
33.         }
    
34.     }
    
35.    
    
36.     if (empty($_POST["website"]))
    
37.     {
    
38.         $website = "";
    
39.     }
    
40.     else
    
41.     {
    
42.         $website = test_input($_POST["website"]);
    
43.         // 检测 URL 地址是否合法
    
44.         if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website))
    
45.         {
    
46.             $websiteErr = "非法的 URL 的地址";
    
47.         }
    
48.     }
    
49.    
    
50.     if (empty($_POST["comment"]))
    
51.     {
    
52.         $comment = "";
    
53.     }
    
54.     else
    
55.     {
    
56.         $comment = test_input($_POST["comment"]);
    
57.     }
    
58.    
    
59.     if (empty($_POST["gender"]))
    
60.     {
    
61.         $genderErr = "性别是必需的";
    
62.     }
    
63.     else
    
64.     {
    
65.         $gender = test_input($_POST["gender"]);
    
66.     }
    
67. }
    
68. 
    
69. function test_input($data)
    
70. {
    
71.     $data = trim($data);
    
72.     $data = stripslashes($data);
    
73.     $data = htmlspecialchars($data);
    
74.     return $data;
    
75. }
    
76. ?>
    
77. 
    
78. <h2>PHP 表单验证实例</h2>
    
79. <p><span class="error">* 必需字段。</span></p>
    
80. <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
    
81.    名字: <input type="text" name="name" value="<?php echo $name;?>">
    
82.    <span class="error">* <?php echo $nameErr;?></span>
    
83.    <br><br>
    
84.    E-mail: <input type="text" name="email" value="<?php echo $email;?>">
    
85.    <span class="error">* <?php echo $emailErr;?></span>
    
86.    <br><br>
    
87.    网址: <input type="text" name="website" value="<?php echo $website;?>">
    
88.    <span class="error"><?php echo $websiteErr;?></span>
    
89.    <br><br>
    
90.    备注: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>
    
91.    <br><br>
    
92.    性别:
    
93.    <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?>  value="female">女
    
94.    <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?>  value="male">男
    
95.    <span class="error">* <?php echo $genderErr;?></span>
    
96.    <br><br>
    
97.    <input type="submit" name="submit" value="Submit">
    
98. </form>
    
99. 
    
100. <?php
     
101. echo "<h2>您输入的内容是:</h2>";
     
102. echo $name;
     
103. echo "<br>";
     
104. echo $email;
     
105. echo "<br>";
     
106. echo $website;
     
107. echo "<br>";
     
108. echo $comment;
     
109. echo "<br>";
     
110. echo $gender;
     
111. ?>
     
112. 
     
113. </body>
     
114. </html>

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