PHP sending email showing content in body not as attachment

I am new to PHP. I am trying to send email with attachment in PHP. But the post was downloading all the contents of the attachment in the body itself, not as an attachment.

here is my PHPcode

if( ! ini_get('date.timezone') )
{
    date_default_timezone_set('GMT');
}
$random_hash = md5(date('r', time()));
$headers .= "\r\nContent-Type: multipart/mixed; 

boundary=\"PHP-mixed-".$random_hash."\"";
// Set your file path here
$attachment = chunk_split(base64_encode(file_get_contents("images.jpg"))); 


//define the body of the message.
$message = "--PHP-mixed-$random_hash\r\n"."Content-Type: multipart/alternative; 
boundary=\"PHP-alt-$random_hash\"\r\n\r\n";
$message .= "--PHP-alt-$random_hash\r\n"."Content-Type: text/plain; 
charset=\"iso-8859-1\"\r\n"."Content-Transfer-Encoding: 7bit\r\n\r\n";


//Insert the html message.
$message .= $htmlbody;
$message .="\r\n\r\n--PHP-alt-$random_hash--\r\n\r\n";


//include attachment
$message .= "--PHP-mixed-$random_hash\r\n"."Content-Type: application/zip; 
name=\"logo.png\"\r\n"."Content-Transfer-Encoding: 
base64\r\n"."Content-Disposition: attachment\r\n\r\n";

$message .= $attachment;
$message .= "/r/n--PHP-mixed-$random_hash--";

$retval = mail ($to,$subject,$message,$header);
   if( $retval == true )
   {
      echo "Message sent successfully...";
   }
   else
   {
      echo "Message could not be sent...";
   }

      

        
        
        
      

    

:

--PHP-mixed-702d78a6f5c1602c03250f197d9c8f50
Content-Type: multipart/alternative;
boundary="PHP-alt-702d78a6f5c1602c03250f197d9c8f50"

--PHP-alt-702d78a6f5c1602c03250f197d9c8f50
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

 Your Mail Contant Here.... You can use html tags here...

--PHP-alt-702d78a6f5c1602c03250f197d9c8f50--

--PHP-mixed-702d78a6f5c1602c03250f197d9c8f50
Content-Type: application/zip;
name="logo.png"
Content-Transfer-Encoding:
base64
Content-Disposition: attachment

/9j/4AAQSkZJRgABAgEASABIAAD/4RSoRXhpZgAATU0AKgAAAAgABwESAAMAAAABAAEAAAEaAAUA
AAABAAAAYgEbAAUAAAABAAAAagEoAAMAAAABAAIAAAExAAIAAAAUAAAAcgEyAAIAAAAUAAAAhodp
AAQAAAABAAAAnAAAAMgAAABIAAAAAQAAAEgAAAABQWRvYmUgUGhvdG9zaG9wIDcuMAAyMDEzOjEx
OjA2IDE3OjA5OjMyAAAAAAOgAQADAAAAAf//AACgAgAEAAAAAQAAAVmgAwAEAAAAAQAAANAAAAAA
AAAABgEDAAMAAAABAAYAAAEaAAUAAAABAAABFgEbAAUAAAABAAABHgEoAAMAAAABAAIAAAIBAAQA
AAABAAABJgICAAQAAAABAAATegAAAAAAAABIAAAAAQAAAEgAAAAB/9j/4AAQSkZJRgABAgEASABI
AAD/7QAMQWRvYmVfQ00AAv/uAA5BZG9iZQBkgAAAAAH/2wCEAAwICAgJCAwJCQwRCwoLERUPDAwP
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AE0AgAMBIgACEQEDEQH/3QAEAAj/xAE/AAABBQEBAQEBAQAAAAAAAAADAAECBAUGBwgJCgsBAAEF
AQEBAQEBAAAAAAAAAAEAAgMEBQYHCAkKCxAAAQQBAwIEAgUHBggFAwwzAQACEQMEIRIxBUFRYRMi
cYEyBhSRobFCIyQVUsFiMzRygtFDByWSU/Dh8WNzNRaisoMmRJNUZEXCo3Q2F9JV4mXys4TD03Xj
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WwGkkPXHNt3zJOgazRoY4uK9vAf6YGpP/FdDnlE3e2bNa2JQyTAASGua4rknrPsH...

      

        
        
        
      

    

Please help me to solve this problem.

Overlooked a lot, although I'm new to PHP, can't fix my problem

Thanks in advance.