在 PHP 中使用 IMAP 将附件下载到目录，随机工作

Posted 2023-02-16

【中文标题】在 PHP 中使用 IMAP 将附件下载到目录，随机工作

【英文标题】：Downloading attachments to directory with IMAP in PHP, randomly works

【发布时间】：2011-02-08 15:01:01

【问题描述】：

我在网上找到了 php 代码，可以从这里使用 IMAP 将附件下载到目录。 http://www.nerdydork.com/download-pop3imap-email-attachments-with-php.html

我稍微修改了一下

        $structure = imap_fetchstructure($mbox, $jk);
        $parts = ($structure->parts);

到

        $structure = imap_fetchstructure($mbox, $jk);
        $parts = ($structure);

让它正常运行，否则我得到一个关于 stdClass 没有定义名为 $parts 的属性的错误。这样做，我能够下载所有附件。不过最近我又试了一次，还是不行。好吧，它没有工作 6 次，工作了 7 次，然后就没有工作了。我认为这与我搞砸了部件处理有关，因为 count($parts) 一直为每条消息返回 1，所以它没有找到我认为的任何附件。

由于它在某一时刻毫无问题地下载了附件，因此我确信事情正在搞砸的地方就在这里。在此代码块之前是一个 for 循环，它遍历框中的每条消息，之后是一个循环，它只遍历每个 imap 结构的 $parts。感谢您的任何帮助，您可以提供。我查看了 php.net 上的 imap_fetchstructure 页面，无法弄清楚我做错了什么。

编辑：我只是在输入我的问题后仔细检查了文件夹，它全部弹出。我觉得我快疯了。在我开始输入之前的几分钟内，我没有运行代码，对我来说，触发需要这么长时间是没有意义的。我的邮箱中有大约 800 条消息，但我认为它在 PHP 的最后打印了我的声明，所有文件创建工作都已完成。

【问题讨论】：

你需要选择一个答案，尼克。

【参考方案1】：

查看此代码：

           $structure = imap_fetchstructure($mailbox, $index);

       $attachments = array();
       if(isset($structure->parts) && count($structure->parts)) 
         for($i = 0; $i < count($structure->parts); $i++) 
           $attachments[$i] = array(
              'is_attachment' => false,
              'filename' => '',
              'name' => '',
              'attachment' => '');

           if($structure->parts[$i]->ifdparameters) 
             foreach($structure->parts[$i]->dparameters as $object) 
               if(strtolower($object->attribute) == 'filename') 
                 $attachments[$i]['is_attachment'] = true;
                 $attachments[$i]['filename'] = $object->value;
               
             
           

           if($structure->parts[$i]->ifparameters) 
             foreach($structure->parts[$i]->parameters as $object) 
               if(strtolower($object->attribute) == 'name') 
                 $attachments[$i]['is_attachment'] = true;
                 $attachments[$i]['name'] = $object->value;
               
             
           

           if($attachments[$i]['is_attachment']) 
             $attachments[$i]['attachment'] = imap_fetchbody($connection, $message_number, $i+1);
             if($structure->parts[$i]->encoding == 3)  // 3 = BASE64
               $attachments[$i]['attachment'] = base64_decode($attachments[$i]['attachment']);
             
             elseif($structure->parts[$i]->encoding == 4)  // 4 = QUOTED-PRINTABLE
               $attachments[$i]['attachment'] = quoted_printable_decode($attachments[$i]['attachment']);
             
                        
          // for($i = 0; $i < count($structure->parts); $i++)
        // if(isset($structure->parts) && count($structure->parts))

【参考方案2】：

这是最终的工作样本

<? include('application.php'); 
/* connect to gmail */
$hostname = 'imap.gmail.com:993/imap/sslINBOX';
$username = '[e-mail]';
$password = 'XX';

/* try to connect */
$inbox = imap_open($hostname,$username,$password) or die('Cannot connect to Gmail: ' . imap_last_error());

/* grab emails */
$emails = imap_search($inbox, 'FROM "[e-mail]"');



/* if emails are returned, cycle through each... */
if($emails) 

  /* begin output var */
  $output = '';

  /* put the newest emails on top */
  rsort($emails);




    foreach($emails as $email_number) 

    /* get information specific to this email */
    $overview = imap_fetch_overview($inbox,$email_number,0);
    $message = imap_fetchbody($inbox,$email_number,2);
    $structure = imap_fetchstructure($inbox,$email_number);


    pre($overview);


     $attachments = array();
       if(isset($structure->parts) && count($structure->parts)) 
         for($i = 0; $i < count($structure->parts); $i++) 
           $attachments[$i] = array(
              'is_attachment' => false,
              'filename' => '',
              'name' => '',
              'attachment' => '');

           if($structure->parts[$i]->ifdparameters) 
             foreach($structure->parts[$i]->dparameters as $object) 
               if(strtolower($object->attribute) == 'filename') 
                 $attachments[$i]['is_attachment'] = true;
                 $attachments[$i]['filename'] = $object->value;
               
             
           

           if($structure->parts[$i]->ifparameters) 
             foreach($structure->parts[$i]->parameters as $object) 
               if(strtolower($object->attribute) == 'name') 
                 $attachments[$i]['is_attachment'] = true;
                 $attachments[$i]['name'] = $object->value;
               
             
           

           if($attachments[$i]['is_attachment']) 
             $attachments[$i]['attachment'] = imap_fetchbody($inbox, $email_number, $i+1);
             if($structure->parts[$i]->encoding == 3)  // 3 = BASE64
               $attachments[$i]['attachment'] = base64_decode($attachments[$i]['attachment']);
             
             elseif($structure->parts[$i]->encoding == 4)  // 4 = QUOTED-PRINTABLE
               $attachments[$i]['attachment'] = quoted_printable_decode($attachments[$i]['attachment']);
             
                        
          // for($i = 0; $i < count($structure->parts); $i++)
        // if(isset($structure->parts) && count($structure->parts))


    if(count($attachments)!=0)
        foreach($attachments as $at)
            if($at['is_attachment']==1)
                file_put_contents($at['filename'], $at['attachment']);
            
        
    

  

 // echo $output;
 

/* close the connection */
imap_close($inbox);

?>

【讨论】：

我试过了，"$attachments[$i]['attachment']" 在 imap_fetchbody($inbox, $email_number, $i+1) 之后总是为空 - 数组中有名称，但附件键中没有内容。为什么？

能否提供您使用的 imap 类的链接

【参考方案3】：

这是完美的工作答案，试试这个。

此示例运行正常，下载所有附件都没有问题。

<?php

set_time_limit(3000); 

/* connect to gmail with your credentials */
$hostname = 'imap.gmail.com:993/imap/sslINBOX';
$username = 'YOUR_USERNAME'; 
$password = 'YOUR_PASSWORD';

/* try to connect */
$inbox = imap_open($hostname,$username,$password) or die('Cannot connect to Gmail: ' . imap_last_error());

$emails = imap_search($inbox, 'FROM "[e-mail]"');

/* if any emails found, iterate through each email */
if($emails) 

    $count = 1;

    /* put the newest emails on top */
    rsort($emails);

    /* for every email... */
    foreach($emails as $email_number) 
    

        /* get information specific to this email */
        $overview = imap_fetch_overview($inbox,$email_number,0);

        $message = imap_fetchbody($inbox,$email_number,2);

        /* get mail structure */
        $structure = imap_fetchstructure($inbox, $email_number);

        $attachments = array();

        /* if any attachments found... */
        if(isset($structure->parts) && count($structure->parts)) 
        
            for($i = 0; $i < count($structure->parts); $i++) 
            
                $attachments[$i] = array(
                    'is_attachment' => false,
                    'filename' => '',
                    'name' => '',
                    'attachment' => ''
                );

                if($structure->parts[$i]->ifdparameters) 
                
                    foreach($structure->parts[$i]->dparameters as $object) 
                    
                        if(strtolower($object->attribute) == 'filename') 
                        
                            $attachments[$i]['is_attachment'] = true;
                            $attachments[$i]['filename'] = $object->value;
                        
                    
                

                if($structure->parts[$i]->ifparameters) 
                
                    foreach($structure->parts[$i]->parameters as $object) 
                    
                        if(strtolower($object->attribute) == 'name') 
                        
                            $attachments[$i]['is_attachment'] = true;
                            $attachments[$i]['name'] = $object->value;
                        
                    
                

                if($attachments[$i]['is_attachment']) 
                
                    $attachments[$i]['attachment'] = imap_fetchbody($inbox, $email_number, $i+1);

                    /* 3 = BASE64 encoding */
                    if($structure->parts[$i]->encoding == 3) 
                     
                        $attachments[$i]['attachment'] = base64_decode($attachments[$i]['attachment']);
                    
                    /* 4 = QUOTED-PRINTABLE encoding */
                    elseif($structure->parts[$i]->encoding == 4) 
                     
                        $attachments[$i]['attachment'] = quoted_printable_decode($attachments[$i]['attachment']);
                    
                
            
        

        /* iterate through each attachment and save it */
        foreach($attachments as $attachment)
        
            if($attachment['is_attachment'] == 1)
            
                $filename = $attachment['name'];
                if(empty($filename)) $filename = $attachment['filename'];

                if(empty($filename)) $filename = time() . ".dat";
                $folder = "attachment";
                if(!is_dir($folder))
                
                     mkdir($folder);
                
                $fp = fopen("./". $folder ."/". $email_number . "-" . $filename, "w+");
                fwrite($fp, $attachment['attachment']);
                fclose($fp);
            
        
    
 

/* close the connection */
imap_close($inbox);

echo "all attachment Downloaded";

?>

更多，见链接

http://www.codediesel.com/php/downloading-gmail-attachments-in-php-an-update/

【讨论】：

这对我来说非常有效，这应该是公认的答案。

很高兴帮助@GeorgeGarey

帮助很大！

很高兴@N.Dias

【参考方案4】：

    //may this help you...good luck
    date_default_timezone_set('UTC');
    error_reporting(E_ALL);
    ini_set('display_errors', '1');     
    ini_set('memory_limit', '-1');     
    ini_set('max_execution_time', 0); 
    set_time_limit(3000); 
    $fName = [];
    if ($subject=='xyz subject' || $subject=='xyz subject')$folder_name = $subject;
    else$folder_name = substr($subject,stripos($subject,':')+2);
    $list = glob('downloads/xyz/'.$folder_name.'/*');
    foreach($list as  $key => $filename)$explodeName = explode('/', $filename);$fName[] = $explodeName[2];
    foreach($list as $file)if(is_file($file))unlink($file);     

    $hostname = 'imap.gmail.com:993/imap/sslInbox';
    $username = '[e-mail]';
    $password = '*******************';

    $inbox = imap_open($hostname,$username,$password) or die('Cannot connect to Gmail: ' . imap_last_error());  
    $emails   = imap_search($inbox, 'SUBJECT "'.$subject.'"');
    foreach ($emails as $key => $value) 

        $overview = imap_fetch_overview($inbox,$value,0);
        $message_date = new DateTime($overview[0]->date);
        $date = $message_date->format('Ymd');
        $message = imap_fetchbody($inbox,$value,2);
        $structure = imap_fetchstructure($inbox, $value);
        $attachments = [];
        if(isset($structure->parts) && count($structure->parts)) 
        
            for($i = 0; $i < count($structure->parts); $i++) 
            
                $attachments[$i] = array(
                        'is_attachment' => false,
                        'filename' => '',
                        'name' => '',
                        'attachment' => ''
                    );
                if($structure->parts[$i]->ifdparameters) 
                
                    foreach($structure->parts[$i]->dparameters as $object) 
                    
                        if(strtolower($object->attribute) == 'filename') 
                        
                            $attachments[$i]['is_attachment'] = true;
                            $attachments[$i]['filename'] = $object->value;
                        
                    
                

                if($structure->parts[$i]->ifparameters) 
                
                    foreach($structure->parts[$i]->parameters as $object) 
                    
                        if(strtolower($object->attribute) == 'name') 
                        
                            $attachments[$i]['is_attachment'] = true;
                            $attachments[$i]['name'] = $object->value;
                        
                    
                

                if($attachments[$i]['is_attachment']) 
                
                    $attachments[$i]['attachment'] = imap_fetchbody($inbox, $value, $i+1);                           
                    if($structure->parts[$i]->encoding == 3) //3 = BASE64 encoding
                     
                        $attachments[$i]['attachment'] = base64_decode($attachments[$i]['attachment']);
                    
                    elseif($structure->parts[$i]->encoding == 4) //4 = QUOTED-PRINTABLE encoding
                     
                        $attachments[$i]['attachment'] = quoted_printable_decode($attachments[$i]['attachment']);
                    
                
            
            foreach($attachments as $attachment)//iterate through each attachment and save it
            
                if($attachment['is_attachment'] == 1)
                
                    $filename = $attachment['name'];                        
                    if(empty($filename)) $filename = $attachment['filename'];
                    if(empty($filename)) $filename = time() . ".dat";
                    $new_fileName = $date.'-'.$value.'-'.$filename;                        
                    if(!in_array($new_fileName, $fName))
                    
                        $folder='./downloads/xyz/'.$folder_name.'/';
                        if(!is_dir($folder))mkdir($folder);
                        $fp = fopen("./". $folder ."/". $date . "-". $value."-". $filename, "w+");
                        fwrite($fp, $attachment['attachment']);
                        fclose($fp);
                    
                
            
        
        imap_mail_move($inbox,$overview[0]->msgno,'xyz_label'); 
        imap_expunge($inbox); 

        /*  ->Always try to read/open the email by subject/or according to need
            ->Move or Delete Old/not required mail, so that u don't need to search/load lots of email
            ->Avoiding unnecessary and old email of the same subject , is to move/delete the same.
        */
    
    imap_close($inbox);//Never forget to close the connection

【参考方案5】：

一些错误修复和对完美工作的答案的改进

$structure = imap_fetchstructure($mailbox, $email_number);
$attachments = [];

foreach ($structure->parts as $part) 
    $is_attachment = (isset($part->disposition) && $part->disposition == 'ATTACHMENT');

    if ($part->ifdparameters) 
        foreach ($part->dparameters as $object) 
            if (strtolower($object->attribute) == 'filename') 
                $is_attachment = true;
                $filename = $object->value;
                break;
            
        
    

    if ($part->ifparameters) 
        foreach ($part->parameters as $object) 
            if (strtolower($object->attribute) == 'name') 
                $is_attachment = true;
                $name = $object->value;
                break;
            
        
    

    if (!$is_attachment) 
        continue;
    
    
    $attachment = imap_fetchbody($mailbox, $email_number, $email_number+1);

    if ($part->encoding == 3) 
        $attachment = base64_decode($attachment);
     elseif ($part->encoding == 4) 
        $attachment = quoted_printable_decode($attachment);
    

    $attachments[] = [
        'is_attachment' => $is_attachment,
        'filename' => isset($filename) ? $filename : '',
        'name' => isset($name) ? $name : '',
        'attachment' => isset($attachment) ? $attachment : ''
    ];



/* iterate through each attachment and save it */
$folder = "attachment";
if (!is_dir($folder)) 
         mkdir($folder);
    

foreach ($attachments as $attachment) 

    if (!empty($attachment['name'])) 
        $filename = $attachment['name'];
     elseif (!empty($attachment['filename'])) 
        $filename = $attachment['filename'];
     else 
        $filename = time().'.dat';
    

    $destination = './'.$folder.'/'.$email_number.'-'.$filename;

    file_put_contents($destination, $attachment['attachment']);

count 如果输入是假的，则返回 1（真实），因此您不应该以这种方式在比较中使用它 当你可以使用foreach时，你不需要循环for：让事情变得简单 仅在实际有用时才将新项目添加到数组附件中：添加稍后将在保存时跳过的项目是没有意义的 foreach 循环遍历可迭代对象，如果 count 为 0，则根本不循环：无需在 foreach 之前检查 count 无需分配 $filename 和覆盖：只需通过比较检查，并直接分配正确的值或默认情况 file_put_contents 等同于依次调用fopen()、fwrite() 和fclose() 将数据写入文件 对 $is_attachment 进行更强大的检查 mkdir 文件夹应保持在循环之外，因为文件夹始终相同