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 <?php127 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>PHP实现表单完整验证
原文地址：https://www.cnblogs.com/null-/p/9717313.html