| 1 |  |  | <?php | 
                            
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                | 2 |  |  | // This file is part of Moodle - http://moodle.org/ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 3 |  |  | // | 
            
                                                                                                            
                            
            
                                    
            
            
                | 4 |  |  | // Moodle is free software: you can redistribute it and/or modify | 
            
                                                                                                            
                            
            
                                    
            
            
                | 5 |  |  | // it under the terms of the GNU General Public License as published by | 
            
                                                                                                            
                            
            
                                    
            
            
                | 6 |  |  | // the Free Software Foundation, either version 3 of the License, or | 
            
                                                                                                            
                            
            
                                    
            
            
                | 7 |  |  | // (at your option) any later version. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 8 |  |  | // | 
            
                                                                                                            
                            
            
                                    
            
            
                | 9 |  |  | // Moodle is distributed in the hope that it will be useful, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 10 |  |  | // but WITHOUT ANY WARRANTY; without even the implied warranty of | 
            
                                                                                                            
                            
            
                                    
            
            
                | 11 |  |  | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the | 
            
                                                                                                            
                            
            
                                    
            
            
                | 12 |  |  | // GNU General Public License for more details. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 13 |  |  | // | 
            
                                                                                                            
                            
            
                                    
            
            
                | 14 |  |  | // You should have received a copy of the GNU General Public License | 
            
                                                                                                            
                            
            
                                    
            
            
                | 15 |  |  | // along with Moodle.  If not, see <http://www.gnu.org/licenses/>. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 16 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 17 |  |  | /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 18 |  |  |  * Front-end class. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 19 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 20 |  |  |  * @package availability_maxviews | 
            
                                                                                                            
                            
            
                                    
            
            
                | 21 |  |  |  * @copyright 2015 Daniel Neis Araujo | 
            
                                                                                                            
                            
            
                                    
            
            
                | 22 |  |  |  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later | 
            
                                                                                                            
                            
            
                                    
            
            
                | 23 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 24 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 25 |  |  | namespace availability_maxviews; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 26 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 27 |  |  | defined('MOODLE_INTERNAL') || die(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 28 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 29 |  |  | /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 30 |  |  |  * Front-end class. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 31 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 32 |  |  |  * @package availability_maxviews | 
            
                                                                                                            
                            
            
                                    
            
            
                | 33 |  |  |  * @copyright 2015 Daniel Neis Araujo | 
            
                                                                                                            
                            
            
                                    
            
            
                | 34 |  |  |  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later | 
            
                                                                                                            
                            
            
                                    
            
            
                | 35 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 36 |  |  | class frontend extends \core_availability\frontend { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 37 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 38 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 39 |  |  |      * This plugin was tested with several core plugins and relies on events which has crud = "r". | 
            
                                                                                                            
                            
            
                                    
            
            
                | 40 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 41 |  |  |      * There are issues with the Wiki, Label and Book modules. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 42 |  |  |      * For details see: https://github.com/danielneis/moodle-availability_maxviews/issues/2 | 
            
                                                                                                            
                            
            
                                    
            
            
                | 43 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 44 |  |  |      * @param \stdClass $course Course object | 
            
                                                                                                            
                            
            
                                    
            
            
                | 45 |  |  |      * @param \cm_info $cm Course-module currently being edited (null if none) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 46 |  |  |      * @param \section_info $section Section currently being edited (null if none) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 47 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 48 |  |  |     protected function allow_add($course, \cm_info $cm = null, \section_info $section = null) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 49 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 50 |  |  |         global $add; | 
                            
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                | 51 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 52 |  |  |         if ($cm) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 53 |  |  |             return (($cm->modname != 'book') && ($cm->modname != 'wiki') && ($cm->modname != 'label')); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 54 |  |  |         } else { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 55 |  |  |             return (($add != 'book') && ($add != 'wiki') && ($add != 'label')); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 56 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 57 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 58 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 59 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 60 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 61 |  |  |      * Gets a list of string identifiers (in the plugin's language file) that | 
            
                                                                                                            
                            
            
                                    
            
            
                | 62 |  |  |      * are required in JavaScript for this plugin. The default returns nothing. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 63 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 64 |  |  |      * You do not need to include the 'title' string (which is used by core) as | 
            
                                                                                                            
                            
            
                                    
            
            
                | 65 |  |  |      * this is automatically added. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 66 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 67 |  |  |      * @return array Array of required string identifiers | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 68 |  |  |      */ | 
            
                                                        
            
                                    
            
            
                | 69 |  |  |     protected function get_javascript_strings() { | 
            
                                                        
            
                                    
            
            
                | 70 |  |  |         return array('ajaxerror', 'fieldlabel'); | 
            
                                                        
            
                                    
            
            
                | 71 |  |  |     } | 
            
                                                        
            
                                    
            
            
                | 72 |  |  | } | 
            
                                                        
            
                                    
            
            
                | 73 |  |  |  | 
            
                        
The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.