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Отправка писем с вложенными картинками на PHP

Пример простой php-функции для отправки писем с картинками внутри.

/**
 * отправка письма с вложениями
 *
 * @param string $from
 * @param string $to

 * @param string $subject
 * @param string $text
 * @param string $cc
 * @param string $arr массив ассоциативных массивов с прикладываемыми файлами

 *     $arr[] = array( 
            type = тип mime,
            name = имя файла (лучше английское),
            content = содержимое файла закодированное  base64_encode() 

        )
 
 * @return unknown
 */
function multipart_mail($from, $to, $subject, $text,$cc=null,$arr=null) {

    global $domain;
    if($domain=='') $domain='http://'.$_SERVER['HTTP_HOST'];
    $headers ="From: $from\r\n";

    $headers.="To: $to\r\n";
    if (!is_null($cc))     {
      $headers.="Cc: $cc\r\n";

    }
    $headers.="Subject: $subject\r\n";
    $headers.="Date: ".date("r")."\r\n";

    $headers.="X-Mailer: zm php script\r\n";
    $headers.="MIME-Version: 1.0\r\n";
    $headers.="Content-Type: multipart/alternative;\r\n";

    $baseboundary="------------".strtoupper(md5(uniqid(rand(), true)));
    $headers.="  boundary=\"$baseboundary\"\r\n";

    $headers.="This is a multi-part message in MIME format.\r\n";
    $message="--$baseboundary\r\n";
    $message.="Content-Type: text/plain; charset=windows-1251\r\n";

    $text_plain=str_replace('<p>',"\r\n",$text);
    $text_plain=str_replace('<b>',"",$text_plain);

    $text_plain=str_replace('</b>',"",$text_plain);
    $text_plain=str_replace('<br>',"\r\n",$text_plain);

    $text_plain= preg_replace('/<a(\s+)href="([^"]+)"([^>]+)>([^<]+)/i'," \$4\n\$2",$text_plain);
    $message.=strip_tags($text_plain);

    //$message.="Content-Transfer-Encoding: 7bit\r\n\r\n";
    $message.="\r\n\r\nIts simple text. Switch to HTML view!\r\n\r\n";
    $message.="--$baseboundary\r\n";
    $newboundary="------------".strtoupper(md5(uniqid(rand(), true)));

    $message.="Content-Type: multipart/related;\r\n";
    $message.="  boundary=\"$newboundary\"\r\n\r\n\r\n";
    $message.="--$newboundary\r\n";
    $message.="Content-Type: text/html; charset=windows-1251\r\n";

    $message.="Content-Transfer-Encoding: 7bit\r\n\r\n";
    $message.=($text)."\r\n\r\n";
    preg_match_all('/img(\s+)src="([^"]+)"/i',$text,$m);

    if (isset($m[2])) {
        $img_f=$m[2];
        if (is_array($img_f)) {

            foreach ($img_f as $k => $v) {
                $img_f[$k]=str_ireplace($domain,$_SERVER['DOCUMENT_ROOT'],$v);

            }
        }
    }
    $attachment_files=$img_f;
    
   if (is_array($attachment_files)) {
      foreach($attachment_files as $filename)  {

             $file_content = file_get_contents($filename,true);
        $mime_type='image/png';
        if(function_exists("mime_content_type"))  {

            $mime_type=mime_content_type($filename);    
        }
        else {
             switch (file_ext($filename))    {

                 case 'jpg': $mime_type='image/jpeg';break;
                 case 'gif': $mime_type='image/gif';break;
                 case 'png': $mime_type='image/png';break;

                 default:;
             }
        }
                $message=str_replace($domain.'/'.$filename,'cid:'.basename($filename),$message);

                $filename=basename($filename);
                $message.="--$newboundary\r\n";
                $message.="Content-Type: $mime_type;\r\n";
                $message.=" name=\"$filename\"\r\n";

                $message.="Content-Transfer-Encoding: base64\r\n";
                $message.="Content-ID: <$filename>\r\n";
                $message.="Content-Disposition: inline;\r\n";
                $message.=" filename=\"$filename\"\r\n\r\n";

                $message.=chunk_split(base64_encode($file_content));
         }
     if(!is_null($arr)){
         foreach ($arr as $v) {

             $mime_type=$v['type'];
             $filename=$v['name'];
                $message.="--$newboundary\r\n";
                $message.="Content-Type: $mime_type;\r\n";

                $message.=" name=\"$filename\"\r\n";
                $message.="Content-Transfer-Encoding: base64\r\n";
                $message.="Content-ID: <$filename>\r\n";
                $message.="Content-Disposition: inline;\r\n";

                $message.=" filename=\"$filename\"\r\n\r\n";
                $message.=chunk_split($v['content']);
             
         }
     }    

    }
    $message.="--$newboundary--\r\n\r\n";
    $message.="--$baseboundary--\r\n";
    return mail($to, $subject, $message , $headers);

}

.

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