PHP block_coupon helper::get_visible_courses示例

 /**
  * form definition
  */
 public function definition()
 {
     $mform =& $this->_form;
     $mform->addElement('header', 'header', get_string('heading:info', 'block_coupon'));
     if (!($strinfo = get_config('block_coupon', 'info_coupon_course'))) {
         $strinfo = get_string('missing_config_info', 'block_coupon');
     }
     $mform->addElement('static', 'info', '', $strinfo);
     $mform->addElement('header', 'header', get_string('heading:input_course', 'block_coupon'));
     // First we'll get some useful info.
     $courses = helper::get_visible_courses();
     // And create data for multiselect.
     $arrcoursesselect = array();
     foreach ($courses as $course) {
         $arrcoursesselect[$course->id] = $course->fullname;
     }
     $attributes = array('size' => min(20, count($arrcoursesselect)));
     // Course id.
     $selectcourse =& $mform->addElement('select', 'coupon_courses', get_string('label:coupon_courses', 'block_coupon'), $arrcoursesselect, $attributes);
     $selectcourse->setMultiple(true);
     $mform->addRule('coupon_courses', get_string('error:required', 'block_coupon'), 'required', null, 'client');
     $mform->addHelpButton('coupon_courses', 'label:coupon_courses', 'block_coupon');
     $this->add_action_buttons(true, get_string('button:next', 'block_coupon'));
 }