View file app/lib/smarty/sysplugins/smarty_internal_compile_private_function_plugin.php

<?php
/**
 * Smarty Internal Plugin Compile Function Plugin
 * Compiles code for the execution of function plugin
 *
 * @package    Smarty
 * @subpackage Compiler
 * @author     Uwe Tews
 */

/**
 * Smarty Internal Plugin Compile Function Plugin Class
 *
 * @package    Smarty
 * @subpackage Compiler
 */
class Smarty_Internal_Compile_Private_Function_Plugin extends Smarty_Internal_CompileBase
{
    /**
     * Attribute definition: Overwrites base class.
     *
     * @var array
     * @see Smarty_Internal_CompileBase
     */
    public $required_attributes = array();

    /**
     * Attribute definition: Overwrites base class.
     *
     * @var array
     * @see Smarty_Internal_CompileBase
     */
    public $optional_attributes = array('_any');

    /**
     * Compiles code for the execution of function plugin
     *
     * @param  array                                $args      array with attributes from parser
     * @param \Smarty_Internal_TemplateCompilerBase $compiler  compiler object
     * @param  array                                $parameter array with compilation parameter
     * @param  string                               $tag       name of function plugin
     * @param  string                               $function  PHP function name
     *
     * @return string compiled code
     */
    public function compile($args, Smarty_Internal_TemplateCompilerBase $compiler, $parameter, $tag, $function)
    {
        // check and get attributes
        $_attr = $this->getAttributes($compiler, $args);

        unset($_attr[ 'nocache' ]);
        // convert attributes into parameter array string
        $_paramsArray = array();
        foreach ($_attr as $_key => $_value) {
            if (is_int($_key)) {
                $_paramsArray[] = "$_key=>$_value";
            } else {
                $_paramsArray[] = "'$_key'=>$_value";
            }
        }
        $_params = 'array(' . implode(",", $_paramsArray) . ')';
        // compile code
        $output = "{$function}({$_params},\$_smarty_tpl)";
        if (!empty($parameter[ 'modifierlist' ])) {
            $output = $compiler->compileTag('private_modifier', array(),
                                            array('modifierlist' => $parameter[ 'modifierlist' ],
                                                  'value' => $output));
        }
        //Does tag create output
        $compiler->has_output = isset($_attr[ 'assign' ]) ? false : true;
        $output = "<?php " . ($compiler->has_output ? "echo " : '') . "{$output};?>\n";
        return $output;
    }
}