I'm having problems concatenating two strings together to use as a message variable in a php mail function.

In my script I have several different mail function. Each one will use the same $message variable, but will have a different sentence added to the beginning.

If I use just the $message variable or the prefix to it ($requester_message) it works fine. But when I combine the two it doesn't work.

PHP Code:
/* ========================================================
===============  Conformation Email to Requester  ======================
===========================================================*/
   
    
$requester_message 'We have received your Request and will be in contact with you shortly.'.$message;
    
$requester_message1 wordwrap($requester_message70);

    
mail($requester_email$subject$requester_message1$headers); 
I have also tried breaking it down to two lines

PHP Code:
/* ========================================================
===============  Conformation Email to Requester  ======================
===========================================================*/
   
    
$requester_message 'We have received your Request and will be in contact with you shortly.';
    
$requester_message $requester_message $message;
    
$requester_message wordwrap($requester_message70);

    
mail($requester_email$subject$requester_message1$headers); 
Any ideas?