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PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.
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You cannot embed function calls or constants in this way unfortunately. You will need to create normal variables for them.
Also, the HTML is way bad!!! Opening and closing tags out of sequence...
Try ...
$_ESOLUTIONNOTSUBSCRIBED = _ESOLUTIONNOTSUBSCRIBED;
$nrsubscribed.= <<< END_SOME_MARKER
<font class="title"><center>$_ES
END_SOME_MARKER;
or
$nrsubscribed.= "<font class=\"title\"><center>" . _ESOLUTIONNOTSUBSCRIBED . "</center></font><br /><br />"'