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                <?php  | 
            
                            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * RE Pro Settings  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package re-pro  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * REProSettings.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class REProSettings { | 
            
                            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * General settings.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @var [Array]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	private $general_settings;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Settings constructor.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function __construct() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( is_admin() ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->general_settings = get_option( 'repro_settings' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			add_action( 'admin_menu', array( $this, 'add_admin_menu' ) );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			add_action( 'admin_init', array( $this, 'settings_init' ) );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Add admin menu.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function add_admin_menu() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		add_options_page( __( 'Real Estate Pro' ), __( 'Real Estate Pro' ), 'manage_options', 're-pro-settings', array( $this, 'render_settings' ) );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Initialize settings fields and sections.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function settings_init() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		register_setting( 'repro_settings', 'repro_settings' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		// General Settings.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		add_settings_section(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'repro_settings',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			__( 'General Settings', 're-pro' ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			array( $this, 'general_callback' ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'repro_general_settings'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		add_settings_field(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'google_maps',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			__( 'Google Maps Module', 're-pro' ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			array( $this, 'google_maps' ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'repro_general_settings',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'repro_settings'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		add_settings_field(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'greatschools_apikey',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			__( 'Great Schools API Key', 're-pro' ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			array( $this, 'greatschools_module' ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'repro_general_settings',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'repro_settings'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		add_settings_field(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'zillow_apikey',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			__( 'Zillow API Key', 're-pro' ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			array( $this, 'zillow_module' ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'repro_general_settings',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'repro_settings'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		add_settings_field(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'sa_apikey',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			__( 'Street Advisor API Key', 're-pro' ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			array( $this, 'street_advisor' ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'repro_general_settings',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'repro_settings'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Feed section callback.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function general_callback() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo esc_attr( 'Activate the modules you would like to use.', 're-pro' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Render Christies field.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function google_maps() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$gmaps_active = isset( $this->general_settings['gmaps_active'] ) ? $this->general_settings['gmaps_active'] : '0';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$gmaps_key = isset( $this->general_settings['gmaps_key'] ) ? $this->general_settings['gmaps_key'] : '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$gmaps_style = isset( $this->general_settings['gmaps_style'] ) ? $this->general_settings['gmaps_style'] : '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$gmaps_zoom = isset( $this->general_settings['gmaps_zoom'] ) ? $this->general_settings['gmaps_zoom'] : '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$checked = checked( '1', $gmaps_active, false );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$is_active = ( '1' === $gmaps_active ) ? 'Deactivate Google maps module?' : 'Activate Google maps module?';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$disable_zoom = checked( '1', $gmaps_zoom, false );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo '<input style="vertical-align: top;" type="checkbox" name="repro_settings[gmaps_active]"' . esc_attr( $checked ) . ' value="1"> ';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo '<div style="display: inline-block;">';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		esc_attr_e( $is_active );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo '</div><br><br>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo '<input class="widefat" type="password" name="repro_settings[gmaps_key]" placeholder="Google maps API key" value="' . $gmaps_key . '">';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo '<span class="description"> Enter your google maps javascript api key</span><br><br>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo '<textarea style="width:500px;" rows="10" cols="50" name="repro_settings[gmaps_style]">';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		esc_attr_e( $gmaps_style );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo '</textarea>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo '<br /><span class="description">Insert valid json to add custom style to maps. Json styles can be generated using <a target="_blank" href="https://snazzymaps.com/">Snazzy Maps</a> or the <a target="_blank" href="https://mapstyle.withgoogle.com/">Google Maps Styling Wizard</a></span><br><br>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo '<input style="vertical-align: top;" type="checkbox" name="repro_settings[gmaps_zoom]"' . esc_attr( $disable_zoom ) . ' value="1"> ';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo '<div style="display: inline-block;">';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo 'Disable scroll zoom in Google Maps';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		echo '</div>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function zillow_module() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    128
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                | 
                    129
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                 | 
                		$zillow_apikey = isset( $this->general_settings['zillow_apikey'] ) ? $this->general_settings['zillow_apikey'] : '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    130
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                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    131
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                 | 
                		echo '<input class="widefat" type="text" name="repro_settings[zillow_apikey]" placeholder="Zillow API Key" value="' . $zillow_apikey . '">';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    132
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                | 
                    133
                 | 
                                    
                                                     | 
                
                 | 
                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    134
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                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    135
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                 | 
                	public function street_advisor() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    136
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                | 
                    137
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                 | 
                		$sa_apikey = isset( $this->general_settings['sa_apikey'] ) ? $this->general_settings['sa_apikey'] : '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    138
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                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                		echo '<input class="widefat" type="text" name="repro_settings[sa_apikey]" placeholder="Street Advisor API Key" value="' . $sa_apikey . '">';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    140
                 | 
                                    
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                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    141
                 | 
                                    
                                                     | 
                
                 | 
                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    142
                 | 
                                    
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                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    143
                 | 
                                    
                                                     | 
                
                 | 
                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    144
                 | 
                                    
                                                     | 
                
                 | 
                	 * greatschools_module function.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    145
                 | 
                                    
                                                     | 
                
                 | 
                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                	 * @access public  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    147
                 | 
                                    
                                                     | 
                
                 | 
                	 * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    148
                 | 
                                    
                                                     | 
                
                 | 
                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    149
                 | 
                                    
                                                     | 
                
                 | 
                	public function greatschools_module() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    150
                 | 
                                    
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                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    151
                 | 
                                    
                                                     | 
                
                 | 
                		$greatschools_apikey = isset( $this->general_settings['greatschools_apikey'] ) ? $this->general_settings['greatschools_apikey'] : '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    152
                 | 
                                    
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                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    153
                 | 
                                    
                                                     | 
                
                 | 
                		echo '<input class="widefat" type="text" name="repro_settings[greatschools_apikey]" placeholder="Great Schools API Key" value="' . $greatschools_apikey . '">';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    154
                 | 
                                    
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                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    155
                 | 
                                    
                                                     | 
                
                 | 
                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    156
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    157
                 | 
                                    
                                                     | 
                
                 | 
                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    158
                 | 
                                    
                                                     | 
                
                 | 
                	 * Render full settings page.  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    159
                 | 
                                    
                                                     | 
                
                 | 
                	 */  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    160
                 | 
                                    
                                                     | 
                
                 | 
                	public function render_settings() { | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    161
                 | 
                                    
                                                     | 
                
                 | 
                		if ( ! current_user_can( 'manage_options' ) ) { | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    162
                 | 
                                    
                                                     | 
                
                 | 
                			wp_die( esc_attr( "You don't have access to this page", 're-pro' ) );  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    163
                 | 
                                    
                                                     | 
                
                 | 
                		}  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    164
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    165
                 | 
                                    
                                                     | 
                
                 | 
                		echo '<div class="wrap">';  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    166
                 | 
                                    
                                                     | 
                
                 | 
                		echo '<form method="post" action="options.php">';  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    167
                 | 
                                    
                                                     | 
                
                 | 
                		echo '<h1>' . esc_attr( 'Real Estate Pro', 're-pro' ) . '</h1>';  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    168
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    169
                 | 
                                    
                                                     | 
                
                 | 
                		settings_fields( 'repro_settings' );  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    170
                 | 
                                    
                                                     | 
                
                 | 
                		do_settings_sections( 'repro_general_settings' );  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    171
                 | 
                                    
                                                     | 
                
                 | 
                		submit_button();  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    172
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    173
                 | 
                                    
                                                     | 
                
                 | 
                		echo '</form>';  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    174
                 | 
                                    
                                                     | 
                
                 | 
                		echo '</div>';  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    175
                 | 
                                    
                                                     | 
                
                 | 
                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    176
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    177
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    178
                 | 
                                    
                                                     | 
                
                 | 
                new REProSettings();  | 
            
            
                                                        
            
                                    
            
            
                | 
                    179
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
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.