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Creating Custom function or tag in Smarty templates

Smarty in-build a lot of function to customize the pages that we want.. the following ways to we can make a new custom function or tags,

Step 1 :-
Need to write the php function in the smarty plug-ins directory,


function smarty_function_sitehost($params, &$smarty){

    if(!isset($params['key'])) {  

       $smarty->trigger_error("Invalid ID");  

         return;  

     }  



   return $_SERVER["HTTP_HOST"];

}