PHP- Send email with attachment file in php

Below is the HTML and PHP code to Send email with attachment file.

HTML CODE

PHP CODE

function mail_attachment($filename, $path, $mailto, $from_mail, $from_name, $replyto, $subject, $message) {
    $file = $path.$filename;
    $file_size = filesize($file);
    $handle = fopen($file, "r");
    $content = fread($handle, $file_size);
    fclose($handle);
    $content = chunk_split(base64_encode($content));
    $uid = md5(uniqid(time()));
    $name = basename($file);
    $header = "From: ".$from_name." <".$from_mail.">\r\n";
    $header .= "Reply-To: ".$replyto."\r\n";
    $header .= "MIME-Version: 1.0\r\n";
    $header .= "Content-Type: multipart/mixed; boundary=\"".$uid."\"\r\n\r\n";
    $header .= "This is a multi-part message in MIME format.\r\n";
    $header .= "--".$uid."\r\n";
    $header .= "Content-type:text/plain; charset=iso-8859-1\r\n";
    $header .= "Content-Transfer-Encoding: 7bit\r\n\r\n";
    $header .= $message."\r\n\r\n";
    $header .= "--".$uid."\r\n";
    $header .= "Content-Type: application/octet-stream; name=\"".$filename."\"\r\n";
    $header .= "Content-Transfer-Encoding: base64\r\n";
    $header .= "Content-Disposition: attachment; filename=\"".$filename."\"\r\n\r\n";
    $header .= $content."\r\n\r\n";
    $header .= "--".$uid."--";
    if (mail($mailto, $subject, "", $header)) {
        echo "mail send ... Successfully";
    } else {
        echo "ERROR!";
    }
}
if(isset($_POST['sub']))
{

$filename = $_FILES['attc']['name'];
move_uploaded_file($_FILES['attc']['tmp_name'],"file_attached/".$filename);
$path = "file_attached/";
$mailto = "your-email@gmail.com";
$from_mail = "from@gmail.com";
$from_name = "from_name";
$replyto = "reply@gmail.com";
$subject = "new testing";
$message = "Please find attached file";
echo mail_attachment($filename, $path, $mailto, $from_mail, $from_name, $replyto, $subject, $message);
}