friendica/library/Smarty/libs/plugins/function.counter.php

<?php
/**
 * Smarty plugin
 *
 * @package    Smarty
 * @subpackage PluginsFunction
 */

/**
 * Smarty {counter} function plugin
 * Type:     function<br>
 * Name:     counter<br>
 * Purpose:  print out a counter value
 *
 * @author Monte Ohrt <monte at ohrt dot com>
 * @link   http://www.smarty.net/manual/en/language.function.counter.php {counter}
 *         (Smarty online manual)
 *
 * @param array                    $params   parameters
 * @param Smarty_Internal_Template $template template object
 *
 * @return string|null
 */
function smarty_function_counter($params, $template)
{
    static $counters = array();

    $name = (isset($params['name'])) ? $params['name'] : 'default';
    if (!isset($counters[$name])) {
        $counters[$name] = array(
            'start'     => 1,
            'skip'      => 1,
            'direction' => 'up',
            'count'     => 1
        );
    }
    $counter =& $counters[$name];

    if (isset($params['start'])) {
        $counter['start'] = $counter['count'] = (int) $params['start'];
    }

    if (!empty($params['assign'])) {
        $counter['assign'] = $params['assign'];
    }

    if (isset($counter['assign'])) {
        $template->assign($counter['assign'], $counter['count']);
    }

    if (isset($params['print'])) {
        $print = (bool) $params['print'];
    } else {
        $print = empty($counter['assign']);
    }

    if ($print) {
        $retval = $counter['count'];
    } else {
        $retval = null;
    }

    if (isset($params['skip'])) {
        $counter['skip'] = $params['skip'];
    }

    if (isset($params['direction'])) {
        $counter['direction'] = $params['direction'];
    }

    if ($counter['direction'] == "down") {
        $counter['count'] -= $counter['skip'];
    } else {
        $counter['count'] += $counter['skip'];
    }

    return $retval;
}