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                <?php  | 
            
                            
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                namespace GV;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /** If this file is called directly, abort. */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                if ( ! defined( 'GRAVITYVIEW_DIR' ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	die();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * The \GV\Join class.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Contains a join between two Sources on two Fields.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Join { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Construct a JOIN container.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param \GV\Source $join The form we're joining to.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param \GV\Field $join_column Its column.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param \GV\Source $join_on The form we're joining on.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param \GV\Field $join_on_column Its column.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return \GV\Joins $this  | 
            
                            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function __construct( $join, $join_column, $join_on, $join_on_column ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( $join instanceof \GV\Source ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->join = $join;  | 
            
                            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( $join_on instanceof \GV\Source ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->join_on = $join_on;  | 
            
                            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( $join_column instanceof \GV\Field ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->join_column = $join_column;  | 
            
                            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( $join_on_column instanceof \GV\Field ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->join_on_column = $join_on_column;  | 
            
                            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Inject this join into the query.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param \GF_Query $query The \GF_Query instance.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return \GF_Query The $query  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	 */  | 
            
            
                                                        
            
                                    
            
            
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                	public function as_query_join( $query ) { | 
            
            
                                                        
            
                                    
            
            
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                		if ( ! gravityview()->plugin->supports( Plugin::FEATURE_JOINS ) ) { | 
            
            
                                                        
            
                                    
            
            
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                			return null;  | 
            
            
                                                        
            
                                    
            
            
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                		}  | 
            
            
                                                        
            
                                    
            
            
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                		if ( ! $query instanceof \GF_Query ) { | 
            
                            
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                			gravityview()->log->error( 'Query not instance of \GF_Query.' );  | 
            
            
                                                        
            
                                    
            
            
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                			return null;  | 
            
            
                                                        
            
                                    
            
            
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                		}  | 
            
            
                                                        
            
                                    
            
            
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                		$join_id    = intval( $this->join->ID );  | 
            
            
                                                        
            
                                    
            
            
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                		$join_on_id = intval( $this->join_on->ID );  | 
            
            
                                                        
            
                                    
            
            
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                		if ( empty( $join_id ) || empty( $join_on_id ) ) { | 
            
            
                                                        
            
                                    
            
            
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                			gravityview()->log->error( 'Query join form not an integer.', array( 'data' => $this ) );  | 
            
            
                                                        
            
                                    
            
            
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                			return null;  | 
            
            
                                                        
            
                                    
            
            
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                		}  | 
            
            
                                                        
            
                                    
            
            
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                		return $query->join(  | 
            
            
                                                        
            
                                    
            
            
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                			new \GF_Query_Column( $this->join_on_column->ID, $join_on_id ),  | 
            
                            
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                			new \GF_Query_Column( $this->join_column->ID, $join_id )  | 
            
            
                                                        
            
                                    
            
            
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                		);  | 
            
            
                                                        
            
                                    
            
            
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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.