register_function

void register_function(string name, mixed impl, bool cacheable, array or null cache_attrs)

Use this to dynamically register template function plugins. Pass in the template function name, followed by the PHP function name that implements it.

The php-function callback impl can be either (a) a string containing the function name or (b) an array of the form array(&$object, $method) with &$object being a reference to an object and $method being a string containing the mehod-name or (c) an array of the form array(&$class, $method) with $class being a classname and $method being a class method of that class.

$cacheable and $cache_attrs can be omitted in most cases. See Controlling Cacheability of Plugins' Output on how to use them properly.

Example 13-22. register_function

$smarty->register_function("date_now", "print_current_date");

function print_current_date ($params) {
    if(empty($params['format']))
        $format = "%b %e, %Y";
    else
        $format = $params['format'];
    return strftime($format,time());
}

// now you can use this in Smarty to print the current date: {date_now}
// or, {date_now format="%Y/%m/%d"} to format it.