一、表单实现样例
在表单中利用POST 提交信息，之后获取到后进行输出。
二、源码实现
在源码中有详细注释
1 <!DOCTYPE html>
2 <html>
3 <head>
4 <meta charset="UTF-8">
5 <title>表单验证网页</title>
6 <style>
7 .error {
8 color: #FF0000;
9 }
10 </style>
11 </head>
12 <body>
13 <!-- php脚本对用户输入进行判断 -->
14 <?php
15 // 定义初始变量
16 $nameErr = $emailErr = $genderErr = $websiteErr = ";";
17 $name = $email = $gender = $website = $comment = $speciality = "";
18 $hobbies = NULL;
19 if ($_SERVER[‘REQUEST_METHOD‘] == "POST") {
20 // 对name输入进行验证
21 if (empty($_POST["name"])) {
22 $nameErr = "名字不能为空";
23 } else {
24 $name = test_input($_POST["name"]);
25 if (! preg_match("/^[a-zA-Z ]*$/", $name)) {
26 // 进行正则表达式的匹配，如果无法匹配，就设置$nameErr
27 $nameErr = "只允许字母和空格";
28 }
29 }
30 // 同理对email进行验证
31 if (empty($_POST["email"])) {
32 $emailErr = "邮箱不能为空";
33 } else {
34 $email = test_input($_POST["email"]);
35 if (! preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/", $email)) {
36 $emailErr = "邮箱格式不正确";
37 }
38 }
39 // 个人网站
40 if (empty($_POST["website"])) {
41 $website = "";
42 } else {
43 $website = test_input($_POST["website"]);
44 if (! preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i", $website)) {
45 $websiteErr = "网站格式非法";
46 }
47 }
48 // 简介部分
49 if (empty($_POST["comment"])) {
50 $comment = "";
51 } else {
52 $comment = test_input($_POST["comment"]);
53 }
54 // 性别
55 if (empty($_POST["gender"])) {
56 $genderErr = "性别是必需的";
57 } else {
58 $gender = test_input($_POST["gender"]);
59 }
60 // 专业
61 if (empty($_POST["speciality"])) {
62 $speciality = "";
63 } else {
64 $speciality = $_POST["speciality"];
65 }
66 // 爱好
67 if (isset($_POST["hobbies"])) {
68 $hobbies = $_POST["hobbies"];
69 }
70 }
71
72 // 通过这个函数来对输入数据进行检测，防止CSS注入脚本攻击
73 function test_input($data)
74 {
75 $data = trim($data); // 去除用户输入中的空格、tab、换行符等信息
76 $data = stripcslashes($data); // 去除输入中的"/"反斜杠，防止有转义符的存在
77 $data = htmlspecialchars($data); // 再次将数据转回html转义代码
78 return $data;
79 }
80 ?>
81
82 <h2>PHP 表单验证实例</h2>
83 <p>
84 <span class="error">* 必需字段。</span>
85 </p>
86 <!-- 表单内容提交后均有记录，提交后不会清空当前页面的所有内容
87 能够实现再次填写。
88 -->
89 <form method="post"
90 action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
91 名字: <input type="text" name="name" value="<?php echo $name;?>"> <span
92 class="error">* <?php echo $nameErr;?></span> <br> <br> E-mail: <input
93 type="text" name="email" value="<?php echo $email;?>"> <span
94 class="error">* <?php echo $emailErr;?></span> <br> <br> 网址: <input
95 type="text" name="website" value="<?php echo $website;?>"> <span
96 class="error"><?php echo $websiteErr;?></span> <br> <br> 备注:
97 <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>
98 <br> <br> 性别: <input type="radio" name="gender"
99 <?php if (isset($gender) && $gender=="female") echo "checked";?>
100 value="female">女 <input type="radio" name="gender"
101 <?php if (isset($gender) && $gender=="male") echo "checked";?>
102 value="male">男 <span class="error">* <?php echo $genderErr;?></span><br>
103 专业： <select name="speciality" id="select">
104 <option value=""
105 <?php if (isset($speciality) && $speciality=="") echo "selected";?>>请选择</option>
106 <option value="java"
107 <?php if (isset($speciality) && $speciality=="java") echo "selected";?>>Java</option>
108 <option value="python"
109 <?php if (isset($speciality) && $speciality=="python") echo "selected";?>>Python</option>
110 <option value="android"
111 <?php if (isset($speciality) && $speciality=="android") echo "selected";?>>Android</option>
112 <option value="ios"
113 <?php if (isset($speciality) && $speciality=="ios") echo "selected";?>>Ios</option>
114 </select><br> 爱好： <br> <input type="checkbox" name="hobbies[]"
115 value="game"
116 <?php if (isset($hobbies) && in_array("game", $hobbies)) echo "checked";?>>打游戏<br>
117 <input type="checkbox" name="hobbies[]" value="ball"
118 <?php if (isset($hobbies) && in_array("ball", $hobbies)) echo "checked";?>>打球
119 <br> <input type="checkbox" name="hobbies[]" value="music"
120 <?php if (isset($hobbies) && in_array("music", $hobbies)) echo "checked";?>>听音乐<br>
121
122 <br> <br> <input type="submit" name="submit" value="Submit"
123 onclick="selected()">
124 </form>
125
126 <?php
127 echo "<h2>您输入的内容是:</h2>";
128 echo "姓名", $name;
129 echo "<br>";
130 echo "邮箱", $email;
131 echo "<br>";
132 echo "网站", $website;
133 echo "<br>";
134 echo "简介", $comment;
135 echo "<br>";
136 echo "性别", $gender;
137 echo "<br>";
138 echo "专业", $speciality;
139 echo "<br>";
140 echo "爱好";
141 if (is_array($hobbies)) {
142 for ($i = 0; $i < count($hobbies); $i ++) {
143 echo $hobbies[$i], ",";
144 }
145 }
146 ?>
147 </body>
原文地址：https://www.cnblogs.com/null-/p/9717313.html
时间： 2024-10-30 03:23:46