I’ve been using Smarty templates a bit recently while
working with WHMCS and ran into an issue. When trying
to do {include 'some_template.tpl'}, I was getting no output. Smarty seemed
to just stop all processing at that point. The fix was maddeningly simple,
especially as I’d tried a bunch of different variations of absolute and
relative paths.
If your template is in a file called some_template.tpl, you need to use:
{include './some_template.tpl'}
In the case of WHMCS, templates are stored in a directory called templates, but you don’t need to specify that as part of the path.