PHP mailer doesn't work in HTML format - php

Question

I'm using a pretty standard e-mail creating function which I've used before, but it doesn't work for some reason I can't figure out. It sends a blank e-mail no matter what content I put inside it.
function sendToUser($email,$admin_email,$subject,$content){
$to=$email;
$random_hash = md5(date('r', time()));
$headers = "From: Site Name <$admin_email>";
$headers .= "\r\nReply-To: $admin_email";
$headers .= "\r\nContent-Type: multipart/alternative; boundary=\"PHP-alt-".$random_hash."\"";
ob_start(); //Turn on output buffering
?>
--PHP-alt-<?php echo $random_hash; ?>
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
<?php echo $content; ?>
--PHP-alt-<?php echo $random_hash; ?>--
<?
//copy current buffer contents into $message variable and delete current output buffer
$message = ob_get_clean();
mail($to, $subject, $message, $headers);
}
Now, if I call it like this:
sendToUser("myprivatemail#yahoo.com","admin#site.com","Testing","E-mail content");
It sends the e-mail, but it arrives empty. Does anyone see what's wrong here? Or could it be some server setting I'm unfamiliar with?

Answer 1

--PHP-alt-<?php echo $random_hash; cannot have whitespace before it.
Try this:
function sendToUser($email,$admin_email,$subject,$content){
$to=$email;
$random_hash = md5(date('r', time()));
$headers = "From: Site Name <$admin_email>";
$headers .= "\r\nReply-To: $admin_email";
$headers .= "\r\nContent-Type: multipart/alternative; boundary=\"PHP-alt-".$random_hash."\"";
ob_start(); //Turn on output buffering
?>
--PHP-alt-<?php echo $random_hash; ?>
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
<?php echo $content; ?>
--PHP-alt-<?php echo $random_hash; ?>--
<?
//copy current buffer contents into $message variable and delete current output buffer
$message = ob_get_clean();
mail($to, $subject, $message, $headers);
}