Send email with the pdf attachment in php - php

Question

I m new to php. I need to send the email with the pdf attachment.I m able to send an email with the attachment. But unable to open the pdf. I get the some error like this
"Acrobat could not oen 'file_name' because it is either not a supported file type or because the file has been damaged(for example, it was sent as an email attachment and wasn't correctly decoded)..."
If someone could help me resolve this problem, that would be great. Thanks!
Here is my code:
$to = 'form#kronova.in, ' . $Email;
$subject = 'ABC :: Admission Form Details';
$repEmail = 'form#kronova.in';
$fileName = 'ABC-Admission.pdf';
$fileatt = $pdf->Output($fileName, 'E');
$attachment = chunk_split($fileatt);
$eol = PHP_EOL;
$separator = md5(time());
$headers = 'From: Principal abc <'.$repEmail.'>'.$eol;
$headers .= 'MIME-Version: 1.0' .$eol;
$headers .= "Content-Type: multipart/mixed; boundary=\"".$separator."\"";
$message = "--".$separator.$eol;
$message .= "Content-Transfer-Encoding: 7bit".$eol.$eol;
$message .= "Thanks for filling online application form. Your online admission registration number is E0000". mysql_insert_id() . "." .$eol;
$message .= "--".$separator.$eol;
$message .= "Content-Type: text/html; charset=\"iso-8859-1\"".$eol;
$message .= "Content-Transfer-Encoding: 8bit".$eol.$eol;
$message .= "--".$separator.$eol;
$message .= "Content-Type: application/pdf; name=\"".$fileName."\"".$eol;
$message .= "Content-Transfer-Encoding: base64".$eol;
$message .= "Content-Disposition: attachment".$eol.$eol;
$message .= $attachment.$eol;
$message .= "--".$separator."--";
if (mail($to, $subject, $message, $headers)){
echo "Email sent";
}
else {
echo "Email failed";
}

Answer 1

Try this:
$attachment = chunk_split(base64_encode($fileatt));
Instead of
$attachment = chunk_split($fileatt);