empty() in email message

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I have an email message

$msg =  'Name: $fname ' . ' $lname\n'
. "Phone: $phone\n"
. "Email: $email\n"

and it works fine, however in this message there are about 30 variables that 
are being called...as such

. "Order: beefschnitzel $beefschnitzel\n"
. "Order: beefstrips $beefstrips\n"
. "Order: cheesesausage $cheesesausage\n"
. "Order: crumbedsausage $crumbedsausage\n"
. "Order: chucksteak $chucksteak\n"
. "Order: cornedbeef $cornedbeef\n"
. "Order: dicedsteak $dicedsteak\n"
. "Order: filletmignon $filletmignon\n"

I want to only send the message if the submitter enters an amount in the 
form for the corresponding variable, instead of having a bunch of empty 
messages.  So I have been trying to use the empty() function as such:

. if empty($beefolives){''} elseif (isset($beefolives)) { 'Order: beefolives 
$beefolives\n'}

But I am getting the error

Parse error: syntax error, unexpected T_IF

Can someone point me in the right direction?

Thank you
-- 
Gary 



__________ Information from ESET Smart Security, version of virus signature database 5699 (20101213) __________

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