1 //表单学习笔记
2 //建立一张表单的验证
3 <!DOCTYPE html>
4 <html>
5 <head>
6 <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
7 <title>表单验证</title>
8 </head>
9 <body>
10 <?php
11 //创建一个检查函数
12
13
14 function test_input($data){
15 $data=trim($data);
16 $data=stripslashes($data);
17 $data=htmlspecialchars($data);
18 return $data;
19 }
20 if(!empty($_POST['submit'])){
21 // 定义变量并设置为空值
22 $nameErr = $emailErr = $genderErr = $websiteErr = "";
23 $name = $email = $gender = $comment = $website = "";
24
25 if ($_SERVER["REQUEST_METHOD"] == "POST") {
26 if (empty($_POST["name"])) {
27 $nameErr = "Name is required";
28 } else {
29 $name = test_input($_POST["name"]);
30 }
31 if(!preg_match("/^[a-zA-Z ]*$/", $name)){
32 $nameErr="只允许字母和空格！";
33 }
34
35 if (empty($_POST["email"])) {
36 $emailErr = "Email is required";
37 } else {
38 $email = test_input($_POST["email"]);
39 }
40 if(!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)){
41 $emailErr = "无效的 email 格式！";
42 }
43
44 if (empty($_POST["website"])) {
45 $website = "";
46 } else {
47 $website = test_input($_POST["website"]);
48 }
49 if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%
50 =~_|]/i",$website)) {
51 $websiteErr = "无效的 URL";
52 }
53
54 if (empty($_POST["comment"])) {
55 $comment = "";
56 } else {
57 $comment = test_input($_POST["comment"]);
58 }
59
60 if (empty($_POST["gender"])) {
61 $genderErr = "Gender is required";
62 } else {
63 $gender = test_input($_POST["gender"]);
64 }
65 }
66 }
67 ?>
68
69 <h2>PHP表单验证</h2>
70 <p style="color:#ff0000">*必填字段</p>
71 <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]) ?>">
72 <p>姓名：<input type="text" name="name"><span style="color:#ff0000">*</span><?php echo $nameErr?></p>
73 <p>邮箱：<input type="text" name="email"><span style="color:#ff0000">*</span><?php echo $emailErr?></p>
74 <p>网址：<input type="text" name="website"><?php echo $websiteErr?></p>
75 <p>评论：<textarea name="comment" rows="5" cols="40"></textarea></p>
76 <p>性别：<input type="radio" name="gender" value="female">女性<input type="radio" name="gender" value="male">男性<span style="color:#ff0000">*</span><?php echo $genderErr?></p>
77 <p><input type="submit" name="submit" value="提交"></p>
78 </form>
79 <h2>您的输入：</h2>
80
81
82 </body>
83 </html>
