Adds warning if private properties are accessed outside its class.

class-wc-facebookcommerce.php

@@ -134,6 +134,23 @@ public function __construct() {
 		$this->init_admin();
 	}
 
+	/**
+	 * __get method for backward compatibility.
+	 *
+	 * @param string $key property name
+	 * @return mixed
+	 * @since x.x.x
+	 */
+	public function __get( $key ) {
+		// Add warning for private properties.
+		if ( in_array( $key, array( 'configuration_detection', 'fb_categories' ), true ) ) {
+			/* translators: %s property name. */
+			_doing_it_wrong( __FUNCTION__, sprintf( esc_html__( 'The %s property is private and should not be accessed outside its class.', 'facebook-for-woocommerce' ), esc_html( $key ) ), 'x.x.x' );
+			return $this->$key;
+		}
+
+		return null;
+	}
 
 	/**
 	 * Initializes the plugin.

facebook-commerce-messenger-chat.php

@@ -46,6 +46,23 @@ public function __construct( $settings ) {
 			add_action( 'wp_footer', array( $this, 'inject_messenger_chat_plugin' ) );
 		}
 
+		/**
+		 * __get method for backward compatibility.
+		 *
+		 * @param string $key property name
+		 * @return mixed
+		 * @since x.x.x
+		 */
+		public function __get( $key ) {
+			// Add warning for private properties.
+			if ( in_array( $key, array( 'page_id', 'jssdk_version' ), true ) ) {
+				/* translators: %s property name. */
+				_doing_it_wrong( __FUNCTION__, sprintf( esc_html__( 'The %s property is private and should not be accessed outside its class.', 'facebook-for-woocommerce' ), esc_html( $key ) ), 'x.x.x' );
+				return $this->$key;
+			}
+
+			return null;
+		}
 
 		/**
 		 * Outputs the Facebook Messenger chat script.

facebook-commerce.php

@@ -385,6 +385,24 @@ public function __construct( WC_Facebookcommerce $facebook_for_woocommerce ) {
 		add_action( 'fb_wc_product_set_delete', [ $this, 'delete_product_set_item' ], 99 );
 	}
 
+	/**
+	 * __get method for backward compatibility.
+	 *
+	 * @param string $key property name
+	 * @return mixed
+	 * @since x.x.x
+	 */
+	public function __get( $key ) {
+		// Add warning for private properties.
+		if ( in_array( $key, array( 'events_tracker', 'messenger_chat', 'background_processor' ), true ) ) {
+			/* translators: %s property name. */
+			_doing_it_wrong( __FUNCTION__, sprintf( esc_html__( 'The %s property is private and should not be accessed outside its class.', 'facebook-for-woocommerce' ), esc_html( $key ) ), 'x.x.x' );
+			return $this->$key;
+		}
+
+		return null;
+	}
+
 	/**
 	 * Initialises Facebook Pixel and its settings.
 	 *

includes/Admin.php

@@ -110,6 +110,24 @@ public function __construct() {
 		add_filter( 'gettext', array( $this, 'change_custom_taxonomy_tip' ), 20, 2 );
 	}
 
+	/**
+	 * __get method for backward compatibility.
+	 *
+	 * @param string $key property name
+	 * @return mixed
+	 * @since x.x.x
+	 */
+	public function __get( $key ) {
+		// Add warning for private properties.
+		if ( 'product_sets' === $key ) {
+			/* translators: %s property name. */
+			_doing_it_wrong( __FUNCTION__, sprintf( esc_html__( 'The %s property is protected and should not be accessed outside its class.', 'facebook-for-woocommerce' ), esc_html( $key ) ), 'x.x.x' );
+			return $this->$key;
+		}
+
+		return null;
+	}
+
 	/**
 	 * Change custom taxonomy tip text
 	 *

includes/Admin/Enhanced_Catalog_Attribute_Fields.php

@@ -54,6 +54,24 @@ public function __construct( $page_type, \WP_Term $term = null, \WC_Product $pro
 		$this->category_handler = facebook_for_woocommerce()->get_facebook_category_handler();
 	}
 
+	/**
+	 * __get method for backward compatibility.
+	 *
+	 * @param string $key property name
+	 * @return mixed
+	 * @since x.x.x
+	 */
+	public function __get( $key ) {
+		// Add warning for private properties.
+		if ( in_array( $key, array( 'page_type', 'term', 'product', 'category_handler' ), true ) ) {
+			/* translators: %s property name. */
+			_doing_it_wrong( __FUNCTION__, sprintf( esc_html__( 'The %s property is private and should not be accessed outside its class.', 'facebook-for-woocommerce' ), esc_html( $key ) ), 'x.x.x' );
+			return $this->$key;
+		}
+
+		return null;
+	}
+
 	public static function render_hidden_input_can_show_attributes() {
 		?>
 		<input type="hidden" id="<?php echo esc_attr( self::FIELD_CAN_SHOW_ENHANCED_ATTRIBUTES_ID ); ?>"

includes/ProductSync/ProductValidator.php

@@ -107,6 +107,24 @@ public function __construct( WC_Facebookcommerce_Integration $integration, WC_Pr
 		$this->integration      = $integration;
 	}
 
+	/**
+	 * __get method for backward compatibility.
+	 *
+	 * @param string $key property name
+	 * @return mixed
+	 * @since x.x.x
+	 */
+	public function __get( $key ) {
+		// Add warning for private properties.
+		if ( 'facebook_product' === $key ) {
+			/* translators: %s property name. */
+			_doing_it_wrong( __FUNCTION__, sprintf( esc_html__( 'The %s property is protected and should not be accessed outside its class.', 'facebook-for-woocommerce' ), esc_html( $key ) ), 'x.x.x' );
+			return $this->$key;
+		}
+
+		return null;
+	}
+
 	/**
 	 * Validate whether the product should be synced to Facebook.
 	 *

includes/fbbackground.php

@@ -27,6 +27,24 @@ public function __construct( $commerce ) {
 			$this->commerce = $commerce; // Full WC_Facebookcommerce_Integration obj
 		}
 
+		/**
+		 * __get method for backward compatibility.
+		 *
+		 * @param string $key property name
+		 * @return mixed
+		 * @since x.x.x
+		 */
+		public function __get( $key ) {
+			// Add warning for private properties.
+			if ( 'commerce' === $key ) {
+				/* translators: %s property name. */
+				_doing_it_wrong( __FUNCTION__, sprintf( esc_html__( 'The %s property is private and should not be accessed outside its class.', 'facebook-for-woocommerce' ), esc_html( $key ) ), 'x.x.x' );
+				return $this->$key;
+			}
+
+			return null;
+		}
+
 		/**
 		 * @var string
 		 */

includes/fbproduct.php

@@ -120,6 +120,24 @@ public function __construct( $wpid, $parent_product = null ) {
 		}
 	}
 
+	/**
+	 * __get method for backward compatibility.
+	 *
+	 * @param string $key property name
+	 * @return mixed
+	 * @since x.x.x
+	 */
+	public function __get( $key ) {
+		// Add warning for private properties.
+		if ( in_array( $key, array( 'fb_description', 'gallery_urls', 'fb_use_parent_image', 'main_description', 'sync_short_description' ), true ) ) {
+			/* translators: %s property name. */
+			_doing_it_wrong( __FUNCTION__, sprintf( esc_html__( 'The %s property is private and should not be accessed outside its class.', 'facebook-for-woocommerce' ), esc_html( $key ) ), 'x.x.x' );
+			return $this->$key;
+		}
+
+		return null;
+	}
+
 	public function exists() {
 		return ( $this->woo_product !== null && $this->woo_product !== false );
 	}