PHP表单验证

  1 <!DOCTYPE html>
  2 <html>
  3 <head>
  4 <title>Test Code</title>
  5 </head>
  6 <body>
  7 <h1>
  8 My PHP Test
  9 <h1>
 10 <?php
 11     echo "<h1><span style="color:#ff0000;">2015/7/15 上午</span></h1>";
 12     echo "A Simple Form-data<br>";
 13     #<a href="/demo/test_get.php?subject=PHP&web=W3school.com.cn">测试 $GET</a>
 14 ?>
 15 <!--一个简单的HTML表单-->
 16 <form action="<?php echo $_SERVER['PHP_SELF']?>"  method="post">
 17   Name:
 18   <input type="text" name="name">
 19   <br>
 20   E-mail:
 21   <input type="text" name="email">
 22   <br>
 23   <input type="submit">
 24 </form>
 25 <?php
 26     $name=$_REQUEST['name'];
 27     echo $name;
 28     ?>
 29 <?php
 30     $nameErr = $emailErr = $genderErr = $websiteErr="";
 31     $name=$email=$gender=$comment=$website="";
 32     // 定义变量并设置为空值
 33 
 34     if ($_SERVER["REQUEST_METHOD"] == "POST") {
 35        if (empty($_POST["name"])) {
 36          $nameErr = "姓名是必填的";
 37        } else {
 38          $name = test_input($_POST["name"]);
 39          if(!preg_match("/^[a-zA-Z]*$/",$name)){
 40              $nameErr="只允许字母和空格";
 41             }
 42        }
 43        
 44        if (empty($_POST["email"])) {
 45          $emailErr = "电邮是必填的";
 46        } else {
 47          $email = test_input($_POST["email"]);
 48          //if (!preg_match("/([w-]+@[w-]+.[w-]+)/",$email)) 
 49          if(!preg_match("/([w-]+@[w-]+.[w-]+)/",$email)){
 50              $emailErr="无效的 Email 格式 ！";
 51          }
 52        }
 53          
 54        if (empty($_POST["website"])) {
 55          $website = "";
 56        } else {
 57          $website = test_input($_POST["website"]);
 58          if (!preg_match("/(?:(?:https?|ftp)://|www.)[-a-z0-9+&@#/%?=~_|!:,.;]*[-a-z0-9+&@#/%=~_|]/i",$website)) {
 59                $websiteErr = "无效的 URL ！"; 
 60            }
 61        }
 62     
 63        if (empty($_POST["comment"])) {
 64          $comment = "";
 65        } else {
 66          $comment = test_input($_POST["comment"]);
 67        }
 68     
 69        if (empty($_POST["gender"])) {
 70          $genderErr = "性别是必选的";
 71        } else {
 72          $gender = test_input($_POST["gender"]);
 73        }
 74     }
 75     
 76     function test_input($data) {
 77        $data = trim($data);
 78        $data = stripslashes($data);
 79        $data = htmlspecialchars($data);
 80        return $data;
 81     }
 82 ?>
 83 <h2>表单验证实例</h2>
 84 <span style="color:#FF0000;">*必填字段</span>
 85 <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP-SELF"]);?>">
 86   <p> 姓名 :
 87     <input type="text" name="name" value="<?php echo $name;?>">
 88     <span style="color:#FF0000"> * <?php echo $nameErr;?></span>
 89   <p> 电邮 :
 90     <input type="text" name="email" value="<?php echo $email;?>">
 91     <span style="color:#FF0000"> * <?php echo $emailErr;?></span>
 92   <p> 网址 :
 93     <input type="text" name="website" value="<?php echo $website;?>">
 94     <span style="color:#FF0000"> * <?php echo $websiteErr;?></span>
 95   <p> 评论 ：
 96     <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>
 97   <p> 性别 :
 98     <input type="radio" name = "gender" 
 99     <?php if(isset($gender)&&$gender=="female") echo "Checked";?>
100     value="female">女性
101     <input type="radio" name = "gender"
102     <?php if(isset($gender)&&$gender=="male") echo "Checked";?>
103      value="male">男性
104      <span style="color:#FF0000"> *</span>
105   <p>
106     <input type="submit" name="submit" value="提交">
107 </form>
108 <?php
109     echo "<h2>您的输入：</h2>";
110     echo $name;
111     echo "<br>";
112     echo $email;
113     echo "<br>";
114     echo $website;
115     echo "<br>";
116     echo $comment;
117     echo "<br>";
118     echo $gender;
119     ?>
120 <!--    
121     （通过PHPtrim()函数）去除用户输入数据中不必要的字符（多余的空格、制表符、换行）
122     （通过 PHP stripslashes() 函数）删除用户输入数据中的反斜杠（）
123     -->
124 
125 </body>
126 </html>