Why doesn't this work in Smarty?
{my_function($test.'a1')}
It's showing following error:
Fatal error: Uncaught exception 'SmartyCompilerException' with message
'Syntax Error in template "test.tpl" on line 1 "{my_function($test.'a1')}"
Unexpected "'a1'", expected one of: "{" , "$" , "identifier" , INTEGER' in...
I have only used smarty a little but I think if you surround your concatenation with backticks then it will evaluate them properly. Example below:
{my_function(`$test.'a1'`)}
There is also the assign built in function which may also be useful: http://www.smarty.net/docsv2/en/language.custom.functions.tpl#language.function.assign
Finally, if all else fails do the concat in php and assign it to a single variable and passing that to the template.
Edit, ignore the above suggestions, I think you should be using the following syntax:
{my_function var="`$test`a1"}