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5.8 Adding headers and automating the reply address

首先贴上到目前为止完成的代码:

form.php的代码:

 1 <?php 2 $errors = array(); 3 $missing = array(); 4 if (isset($_POST[‘send‘])) { 5     $to = ‘david@example.com‘; 6     $subject = ‘Feedback from contact form‘; 7     $expected = array(‘name‘, ‘email‘, ‘comments‘); 8     $required = array(‘name‘, ‘email‘, ‘comments‘); 9     $headers = "From: webmaster@example.com\r\n";10     $headers .= "Content-type: text/plain; charset=utf-8";11     require ‘./includes/mail_process.php‘;12 }13 ?>14 <!DOCTYPE HTML>15 <html>16 <head>17 <meta charset="utf-8">18 <title>Contact Us</title>19 <link href="http://www.mamicode.com/styles.css" rel="stylesheet" type="text/css">20 </head>21 22 <body>23 <h1>Contact Us</h1>24 <?php if ($_POST && $suspect) { ?>25 <p class="warning">Sorry your mail could not be be sent.</p>26 <?php } elseif ($errors || $missing) { ?>27 <p class="warning">Please fix the item(s) indicated.</p>28 <?php }?>29 <form name="contact" method="post" action="<?php echo $_SERVER[‘PHP_SELF‘]; ?>">30     <p>31         <label for="name">Name:32         <?php if ($missing && in_array(‘name‘, $missing)) { ?>33         <span class="warning">Please enter your name</span>34         <?php } ?>35         </label>36         <input type="text" name="name" id="name"37         <?php38         if ($errors || $missing) {39             echo ‘value="http://www.mamicode.com/‘ . htmlentities($name, ENT_COMPAT, ‘utf-8‘) . ‘"‘;40         }41         ?>42         >43     </p>44     <p>45         <label for="email">Email:46         <?php if ($missing && in_array(‘email‘, $missing)) { ?> 47         <span class="warning">Please enter your email address</span>48         <?php } elseif (isset($errors[‘email‘])) { ?>49         <span class="warning">Invalid email address</span>50         <?php } ?>51         </label>52         <input type="text" name="email" id="email"53         <?php54         if ($errors || $missing) {55             echo ‘value="http://www.mamicode.com/‘ . htmlentities($email, ENT_COMPAT, ‘utf-8‘) . ‘"‘;56         }57         ?>58         >59     </p>60     <p>61         <label for="comments">Comments:62         <?php if ($missing && in_array(‘comments‘, $missing)) { ?>63         <span class="warning">You forgot to add your comments</span>64         <?php } ?>65         </label>66         <textarea name="comments" id="comments"><?php 67         if ($errors || $missing) {68             echo htmlentities($comments, ENT_COMPAT, ‘utf-8‘);69         }70         ?></textarea>71     </p>72     <p>73         <input type="submit" name="send" id="send" value="http://www.mamicode.com/Send Comments">74     </p>75 </form>76 </body>77 </html>
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 mail_process.php的代码:

 1 <?php 2 $suspect = false; 3 $pattern = ‘/Content-Type:|Bcc:|Cc:/i‘; 4  5 function isSuspect($val, $pattern, &$suspect) { 6     if (is_array($val)) { 7         foreach ($val as $item) { 8             isSuspect($item, $pattern, $suspect); 9         }10     } else {11         if (preg_match($pattern, $val)) {12             $suspect = true;13         }14     }15 }16 17 isSuspect($_POST, $pattern, $suspect);18 19 if (!$suspect) {20     foreach ($_POST as $key => $value) {21         $temp = is_array($value) ? $value : trim($value);22         if (empty($temp) && in_array($key, $required)) {23             $missing[] = $key;24             $$key = ‘‘;25         } elseif(in_array($key, $expected)) {26             $$key = $temp;27         }28     }29 }30 31 if (!$suspect && !empty($email)) {32     $validemail = filter_input(INPUT_POST, ‘email‘, FILTER_VALIDATE_EMAIL);33     if ($validemail) {34         $headers .= "\r\nReply-to: $validemail";35     } else {36         $errors[‘email‘] = true;37     }38 }
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 知识点1:filter_input

函数filter_input的用法:http://www.w3school.com.cn/php/func_filter_input.asp    http://php.net/manual/en/function.filter-input.php

此处实例:mail_process.php的行32:

 1 $validemail = filter_input(INPUT_POST, ‘email‘, FILTER_VALIDATE_EMAIL); 

INPUT_POST是数据来源,同样的,还可以有其他来源,比如:One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, or INPUT_ENV(数据来源于PHP.net/manual.

‘email‘是variable_name,就是你要过滤的variable。

FILTER_VALIDATE_EMAIL 是规律的规则,这个是和发邮件地址的规则,同样的还有许多其他的规则(无需记忆,使用时候知道哪里去找就行了),扩展阅读:http://php.net/manual/en/filter.filters.php

知识点2:email header的一些写法格式:

首先看form.php的行9,10代码:

9    $headers = "From: webmaster@example.com\r\n";10   $headers .= "Content-type: text/plain; charset=utf-8";

我觉得这个没什么好说的,就是一个格式标准,按照这个格式来写机器才能读得懂。

知识点3:$errors[‘email‘]=true;

具体请看mail_process.php 行36的代码:

36    $errors[‘email‘] = true;

这里应该是将email放到了$errors这个数组中了(这个有待验证,但至少$errors[‘email‘] == true;这就够我们后面用的了)。

知识点4:How to display error message?

这个只是点在前面的笔记中有记录,但是前面的笔记被不小心删除了,这个再补充一下。

请看form.php 行45-50;

45        <label for="email">Email:46       <?php if ($missing && in_array(‘email‘, $missing)) { ?> 47        <span class="warning">Please enter your email address</span>48        <?php } elseif (isset($errors[‘email‘])) { ?>49        <span class="warning">Invalid email address</span>50        <?php } ?>

php的if条件语句可以可以头尾分开放在两个<?php ?>中,中间的HTML部分同样会当做条件与剧中{}中的一部分,只有条件为真的时候才会被客户端解析,否则会被忽略掉。

当然也可以直接用PHP判定语句生成错误信息,但是这样的话,就不方便对CSS信息使用CSS规则了(当然也可以使用,只是需要拐一道弯,不方便而已)。

例如,你可以直接使用:

if(bollen){

  echo "<span class="warning">Please enter your email address</span>";

}

 

5.8 Adding headers and automating the reply address