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                <?php  | 
            
                            
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                if ( ! defined( 'ABSPATH' ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	exit;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * eCheck Payment Gateway  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @since       2.6.0  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package		WooCommerce/Classes  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author 		WooThemes  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                class WC_Payment_Gateway_eCheck extends WC_Payment_Gateway { | 
            
            
                                                                        
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * Builds our payment fields area - including tokenization fields and the actualy payment fields.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * If tokenization is displayed, just the fields will be displayed.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * @since 2.6.0  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function payment_fields() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$display_tokenization = $this->supports( 'tokenization' ) && is_checkout();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( $display_tokenization ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->tokenization_script();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->saved_payment_methods();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->form();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( $display_tokenization ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->save_payment_method_checkbox();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * Outputs fields for entering eCheck information.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 * @since 2.6.0  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function form() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$html           = '';  | 
            
                            
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                		$fields         = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$default_fields = array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'routing-number' => '<p class="form-row form-row-first">  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				<label for="' . esc_attr( $this->id ) . '-routing-number">' . __( 'Routing Number', 'woocommerce' ) . ' <span class="required">*</span></label>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				<input id="' . esc_attr( $this->id ) . '-routing-number" class="input-text wc-echeck-form-routing-number" type="text" maxlength="9" autocomplete="off" placeholder="•••••••••" name="' . esc_attr( $this->id ) . '-routing-number" />  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			</p>',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'account-number' => '<p class="form-row form-row-wide">  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				<label for="' . esc_attr( $this->id ) . '-account-number">' . __( 'Account Number', 'woocommerce' ) . ' <span class="required">*</span></label>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				<input id="' . esc_attr( $this->id ) . '-account-number" class="input-text wc-echeck-form-account-number" type="text" autocomplete="off" name="' . esc_attr( $this->id ) . '-account-number" maxlength="17" />  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			</p>',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$fields = wp_parse_args( $fields, apply_filters( 'woocommerce_echeck_form_fields', $default_fields, $this->id ) );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		?>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		<fieldset id="<?php echo esc_attr( $this->id ); ?>-cc-form" class='wc-echeck-form'>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			<?php do_action( 'woocommerce_echeck_form_start', $this->id ); ?>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			<?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				foreach ( $fields as $field ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                					echo $field;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			?>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			<?php do_action( 'woocommerce_echeck_form_end', $this->id ); ?>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			<div class="clear"></div>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		</fieldset><?php  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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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.