| 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 |  |  |  * Date condition. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 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 |  |  |  * maxviews condition. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 31 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 32 |  |  |  * @package availability_maxviews | 
            
                                                                                                            
                            
            
                                    
            
            
                | 33 |  |  |  * @copyright 2014 The Open University | 
            
                                                                                                            
                            
            
                                    
            
            
                | 34 |  |  |  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later | 
            
                                                                                                            
                            
            
                                    
            
            
                | 35 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 36 |  |  | class condition extends \core_availability\condition { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 37 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 38 |  |  |     protected $viewslimit; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 39 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 40 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 41 |  |  |      * Constructor. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 42 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 43 |  |  |      * @param \stdClass $structure Data structure from JSON decode | 
            
                                                                                                            
                            
            
                                    
            
            
                | 44 |  |  |      * @throws \coding_exception If invalid data structure. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 45 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 46 |  |  |     public function __construct($structure) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 47 |  |  |         $this->viewslimit = $structure->viewslimit; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 48 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 49 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 50 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 51 |  |  |      * Create object to be saved representing this condition. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 52 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 53 |  |  |     public function save() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 54 |  |  |         return (object)array('type' => 'maxviews', 'viewslimit' => $this->viewslimit); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 55 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 56 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 57 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 58 |  |  |      * Returns a JSON object which corresponds to a condition of this type. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 59 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 60 |  |  |      * Intended for unit testing, as normally the JSON values are constructed | 
            
                                                                                                            
                            
            
                                    
            
            
                | 61 |  |  |      * by JavaScript code. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 62 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 63 |  |  |      * @param int $viewslimit The limit of views for users | 
            
                                                                                                            
                            
            
                                    
            
            
                | 64 |  |  |      * @return stdClass Object representing condition | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 65 |  |  |      */ | 
            
                                                                        
                            
            
                                    
            
            
                | 66 |  |  |     public static function get_json($viewslimit = 5) { | 
            
                                                                        
                            
            
                                    
            
            
                | 67 |  |  |         return (object)array('type' => 'maxviews', 'viewslimit' => (int)$viewslimit); | 
            
                                                                        
                            
            
                                    
            
            
                | 68 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 69 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 70 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 71 |  |  |      * Determines whether a particular item is currently available | 
            
                                                                                                            
                            
            
                                    
            
            
                | 72 |  |  |      * according to this availability condition. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 73 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 74 |  |  |      * @param bool $not Set true if we are inverting the condition | 
            
                                                                                                            
                            
            
                                    
            
            
                | 75 |  |  |      * @param info $info Item we're checking | 
            
                                                                                                            
                            
            
                                    
            
            
                | 76 |  |  |      * @param bool $grabthelot Performance hint: if true, caches information | 
            
                                                                                                            
                            
            
                                    
            
            
                | 77 |  |  |      *   required for all course-modules, to make the front page and similar | 
            
                                                                                                            
                            
            
                                    
            
            
                | 78 |  |  |      *   pages work more quickly (works only for current user) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 79 |  |  |      * @param int $userid User ID to check availability for | 
            
                                                                                                            
                            
            
                                    
            
            
                | 80 |  |  |      * @return bool True if available | 
            
                                                                                                            
                            
            
                                    
            
            
                | 81 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 82 |  |  |     public function is_available($not, \core_availability\info $info, $grabthelot, $userid) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 83 |  |  |         $logmanager = get_log_manager(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 84 |  |  |         if (!$readers = $logmanager->get_readers('core\log\sql_reader')) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 85 |  |  |             // Should be using 2.8, use old class. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 86 |  |  |             $readers = $logmanager->get_readers('core\log\sql_select_reader'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 87 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 88 |  |  |         $reader = array_pop($readers); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 89 |  |  |         $context = $info->get_context(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 90 |  |  |         $viewscount = $reader->get_events_select_count('contextid = :context AND userid = :userid AND crud = :crud', | 
            
                                                                                                            
                            
            
                                    
            
            
                | 91 |  |  |                                                   array('context' => $context->id, 'userid' => $userid, 'crud' => 'r')); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 92 |  |  |         $allow = ($viewscount < $this->viewslimit); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 93 |  |  |         if ($not) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 94 |  |  |             $allow = !$allow; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 95 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 96 |  |  |         return $allow; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 97 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 98 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 99 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 100 |  |  |      * Obtains a string describing this restriction (whether or not | 
            
                                                                                                            
                            
            
                                    
            
            
                | 101 |  |  |      * it actually applies). | 
            
                                                                                                            
                            
            
                                    
            
            
                | 102 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 103 |  |  |      * @param bool $full Set true if this is the 'full information' view | 
            
                                                                                                            
                            
            
                                    
            
            
                | 104 |  |  |      * @param bool $not Set true if we are inverting the condition | 
            
                                                                                                            
                            
            
                                    
            
            
                | 105 |  |  |      * @param info $info Item we're checking | 
            
                                                                                                            
                            
            
                                    
            
            
                | 106 |  |  |      * @return string Information string (for admin) about all restrictions on | 
            
                                                                                                            
                            
            
                                    
            
            
                | 107 |  |  |      *   this item | 
            
                                                                                                            
                            
            
                                    
            
            
                | 108 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 109 |  |  |     public function get_description($full, $not, \core_availability\info $info) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 110 |  |  |         global $USER; | 
                            
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                | 111 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 112 |  |  |         $logmanager = get_log_manager(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 113 |  |  |         if (!$readers = $logmanager->get_readers('core\log\sql_reader')) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 114 |  |  |             // Should be using 2.8, use old class. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 115 |  |  |             $readers = $logmanager->get_readers('core\log\sql_select_reader'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 116 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 117 |  |  |         $reader = array_pop($readers); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 118 |  |  |         $context = $info->get_context(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 119 |  |  |         $viewscount = $reader->get_events_select_count('contextid = :context AND userid = :userid AND crud = :crud', | 
            
                                                                                                            
                            
            
                                    
            
            
                | 120 |  |  |                                                   array('context' => $context->id, 'userid' => $USER->id, 'crud' => 'r')); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 121 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 122 |  |  |         $a = new \stdclass(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 123 |  |  |         $a->viewslimit = $this->viewslimit; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 124 |  |  |         $a->viewscount = $viewscount; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 125 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 126 |  |  |         if ($not) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 127 |  |  |             return get_string('eithernotdescription', 'availability_maxviews', $a); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 128 |  |  |         } else { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 129 |  |  |             return get_string('eitherdescription', 'availability_maxviews', $a); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 130 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 131 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 132 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 133 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 134 |  |  |      * Obtains a representation of the options of this condition as a string, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 135 |  |  |      * for debugging. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 136 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 137 |  |  |      * @return string Text representation of parameters | 
            
                                                                                                            
                            
            
                                    
            
            
                | 138 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 139 |  |  |     protected function get_debug_string() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 140 |  |  |         return gmdate('Y-m-d H:i:s'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 141 |  |  |     } | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 142 |  |  | } | 
            
                                                        
            
                                    
            
            
                | 143 |  |  |  | 
            
                        
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.