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                <?php  | 
            
                            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This program is free software; you can redistribute it and/or modify  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * it under the terms of the GNU General Public License as published by  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * the Free Software Foundation; either version 2 of the License, or  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * (at your option) any later version.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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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. See the  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * GNU General Public License for more details.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * You should have received a copy of the GNU General Public License along  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * with this program; if not, write to the Free Software Foundation, Inc.,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * http://www.gnu.org/copyleft/gpl.html  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @file  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                require_once __DIR__ . '/Maintenance.php';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Run automatically with update.php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * - Changes "rfc" URL to use tools.ietf.org domain  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * - Adds "pmid" interwiki  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @since 1.28  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class AddRFCAndPMIDInterwiki extends LoggedUpdateMaintenance { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function __construct() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		parent::__construct();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->addDescription( 'Add RFC and PMID to the interwiki database table' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected function getUpdateKey() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return __CLASS__;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected function updateSkippedMessage() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return 'RFC and PMID already added to interwiki database table';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	protected function doDBUpdates() { | 
            
            
                                                        
            
                                    
            
            
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                		$interwikiCache = $this->getConfig()->get( 'InterwikiCache' );  | 
            
            
                                                        
            
                                    
            
            
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                		// Using something other than the database,  | 
            
            
                                                        
            
                                    
            
            
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                		if ( $interwikiCache !== false ) { | 
            
            
                                                        
            
                                    
            
            
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                			return true;  | 
            
            
                                                        
            
                                    
            
            
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                		}  | 
            
            
                                                        
            
                                    
            
            
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                		$dbw = $this->getDB( DB_MASTER );  | 
            
            
                                                        
            
                                    
            
            
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                		$rfc = $dbw->selectField(  | 
            
            
                                                        
            
                                    
            
            
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                			'interwiki',  | 
            
            
                                                        
            
                                    
            
            
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                			'iw_url',  | 
            
            
                                                        
            
                                    
            
            
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                			[ 'iw_prefix' => 'rfc' ],  | 
            
            
                                                        
            
                                    
            
            
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                			__METHOD__  | 
            
            
                                                        
            
                                    
            
            
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                		);  | 
            
            
                                                        
            
                                    
            
            
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                		// Old pre-1.28 default value, or not set at all  | 
            
            
                                                        
            
                                    
            
            
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                		if ( $rfc === false || $rfc === 'http://www.rfc-editor.org/rfc/rfc$1.txt' ) { | 
            
            
                                                        
            
                                    
            
            
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                			$dbw->replace(  | 
            
            
                                                        
            
                                    
            
            
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                				'interwiki',  | 
            
            
                                                        
            
                                    
            
            
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                				[ 'iw_prefix' ],  | 
            
            
                                                        
            
                                    
            
            
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                				[  | 
            
            
                                                        
            
                                    
            
            
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                					'iw_prefix' => 'rfc',  | 
            
            
                                                        
            
                                    
            
            
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                					'iw_url' => 'https://tools.ietf.org/html/rfc$1'  | 
            
            
                                                        
            
                                    
            
            
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                				],  | 
            
            
                                                        
            
                                    
            
            
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                				__METHOD__  | 
            
            
                                                        
            
                                    
            
            
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                			);  | 
            
            
                                                        
            
                                    
            
            
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                		}  | 
            
            
                                                        
            
                                    
            
            
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                		$dbw->insert(  | 
            
            
                                                        
            
                                    
            
            
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                			'interwiki',  | 
            
            
                                                        
            
                                    
            
            
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                			[  | 
            
            
                                                        
            
                                    
            
            
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                				'iw_prefix' => 'pmid',  | 
            
            
                                                        
            
                                    
            
            
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                				'iw_url' => 'https://www.ncbi.nlm.nih.gov/pubmed/$1?dopt=Abstract',  | 
            
            
                                                        
            
                                    
            
            
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                			],  | 
            
            
                                                        
            
                                    
            
            
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                			__METHOD__,  | 
            
            
                                                        
            
                                    
            
            
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                			// If there's already a pmid interwiki link, don't  | 
            
            
                                                        
            
                                    
            
            
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                			// overwrite it  | 
            
            
                                                        
            
                                    
            
            
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                			[ 'IGNORE' ]  | 
            
            
                                                        
            
                                    
            
            
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                		);  | 
            
            
                                                        
            
                                    
            
            
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                		return true;  | 
            
            
                                                        
            
                                    
            
            
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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.