Complex heredoc syntax and addition

[ThetaWaveRider]

Hello,

I'm using heredoc syntax, and I'm not sure how to add an integer to a variable (which holds an integer). Right now, I have the following:

$mainbody = <<< EOD
<h4>$first_article thru {$first_article + 9} of $total_articles</h4>
EOD; 

When I run this, I get a "Parse error: parse error, expecting `'}" message. I don't see why the second curly bracket is not being understood. Any ideas, anyone?

Thanks,
TWR

[DarkAngelBGE]

$first_article_tmp = $first_article + 9;

$mainbody = <<< EOD
<h4>{$first_article} thru {$first_article_tmp} of {$total_articles}</h4>
EOD;