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+= in php
http://www.w3schools.com/php/php_operators.asp According to this, I am supposed to be able to use += instead of $email_body = $email_body . '' but it doesn't work...
Judging by the name of your variable:
$email_body, I assume it's a String variable. You cannot do
+= on Strings because that's used for addition (of integers for example).
What you're looking for is
.= which is for concatenating strings.