chamilo-lms2/main/inc/lib/formvalidator/Rule/MaxFileSize.php

<?php
/* For licensing terms, see /license.txt */
/** @author Julio Montoya */

/**
 * Class HTML_QuickForm_Rule_MaxFileSize
 */
class HTML_QuickForm_Rule_MaxFileSize extends HTML_QuickForm_Rule
{
    /**
     * @param $value array     Uploaded file info (from $_FILES)
     * @param null $options
     * @return bool
     */
    public function validate($elementValue, $maxSize)
    {
        if (!empty($elementValue['error']) &&
            (UPLOAD_ERR_FORM_SIZE == $elementValue['error'] || UPLOAD_ERR_INI_SIZE == $elementValue['error'])
        ) {
            return false;
        }
        if (!HTML_QuickForm_file::_ruleIsUploadedFile($elementValue)) {
            return true;
        }

        return ($maxSize >= @filesize($elementValue['tmp_name']));
    }
}