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Template Functions

void smarty_function_name( $params,  
array $params;
object $template;

All attributes passed to template functions from the template are contained in the $params as an associative array.

The output (return value) of the function will be substituted in place of the function tag in the template, eg the {fetch} function. Alternatively, the function can simply perform some other task without any output, eg the {assign} function.

If the function needs to assign some variables to the template or use some other Smarty-provided functionality, it can use the supplied $template object to do so eg $template->foo().

Example 18.1. function plugin with output

 * Smarty plugin
 * -------------------------------------------------------------
 * File:     function.eightball.php
 * Type:     function
 * Name:     eightball
 * Purpose:  outputs a random magic answer
 * -------------------------------------------------------------
function smarty_function_eightball($params, Smarty_Internal_Template $template)
    $answers = array('Yes',
                     'No way',
                     'Outlook not so good',
                     'Ask again soon',
                     'Maybe in your reality');

    $result = array_rand($answers);
    return $answers[$result];

which can be used in the template as:

Question: Will we ever have time travel?
Answer: {eightball}.

Example 18.2. function plugin without output

 * Smarty plugin
 * -------------------------------------------------------------
 * File:     function.assign.php
 * Type:     function
 * Name:     assign
 * Purpose:  assign a value to a template variable
 * -------------------------------------------------------------
function smarty_function_assign($params, Smarty_Internal_Template $template)
    if (empty($params['var'])) {
        trigger_error("assign: missing 'var' parameter");

    if (!in_array('value', array_keys($params))) {
        trigger_error("assign: missing 'value' parameter");

    $template->assign($params['var'], $params['value']);     


See also: registerPlugin(), unregisterPlugin().

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