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                <?php namespace XoopsModules\Extcal;  | 
            
                            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * You may not change or alter any portion of this comment or credits  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * of supporting developers from this source code or any supporting source code  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * which is considered copyrighted (c) material of the original comment or credit authors.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This program is distributed in the hope that it will be useful,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * but WITHOUT ANY WARRANTY; without even the implied warranty of  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright    {@link https://xoops.org/ XOOPS Project} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license      {@link http://www.gnu.org/licenses/gpl-2.0.html GNU GPL 2 or later} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package      extcal  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @since  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author       XOOPS Development Team,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                // defined('XOOPS_ROOT_PATH') || exit('Restricted access.'); | 
            
                            
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                 // require_once __DIR__ . '/ExtcalPersistableObjectHandler.php';  | 
            
                            
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                require_once XOOPS_ROOT_PATH . '/class/uploader.php';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class File.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class File extends \XoopsObject  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * File constructor.  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function __construct()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->initVar('file_id', XOBJ_DTYPE_INT, null, false); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->initVar('file_name', XOBJ_DTYPE_TXTBOX, null, false, 255); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->initVar('file_nicename', XOBJ_DTYPE_TXTBOX, null, false, 255); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->initVar('file_mimetype', XOBJ_DTYPE_TXTBOX, null, false, 255); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->initVar('file_size', XOBJ_DTYPE_INT, null, false); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->initVar('file_download', XOBJ_DTYPE_INT, null, false); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->initVar('file_date', XOBJ_DTYPE_INT, null, false); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->initVar('file_approved', XOBJ_DTYPE_INT, null, false); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->initVar('event_id', XOBJ_DTYPE_INT, null, false); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->initVar('uid', XOBJ_DTYPE_INT, null, false); | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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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.