+ return array_merge( $this->mSecondaryDataUpdates, array( $linksUpdate ) );
+ }
+
+ /**
+ * Attaches arbitrary data to this ParserObject. This can be used to store some information in
+ * the ParserOutput object for later use during page output. The data will be cached along with
+ * the ParserOutput object, but unlike data set using setProperty(), it is not recorded in the
+ * database.
+ *
+ * This method is provided to overcome the unsafe practice of attaching extra information to a
+ * ParserObject by directly assigning member variables.
+ *
+ * To use setExtensionData() to pass extension information from a hook inside the parser to a
+ * hook in the page output, use this in the parser hook:
+ *
+ * @par Example:
+ * @code
+ * $parser->getOutput()->setExtensionData( 'my_ext_foo', '...' );
+ * @endcode
+ *
+ * And then later, in OutputPageParserOutput or similar:
+ *
+ * @par Example:
+ * @code
+ * $output->getExtensionData( 'my_ext_foo' );
+ * @endcode
+ *
+ * In MediaWiki 1.20 and older, you have to use a custom member variable
+ * within the ParserOutput object:
+ *
+ * @par Example:
+ * @code
+ * $parser->getOutput()->my_ext_foo = '...';
+ * @endcode
+ *
+ * @since 1.21
+ *
+ * @param string $key The key for accessing the data. Extensions should take care to avoid
+ * conflicts in naming keys. It is suggested to use the extension's name as a
+ * prefix.
+ *
+ * @param mixed $value The value to set. Setting a value to null is equivalent to removing
+ * the value.
+ */
+ public function setExtensionData( $key, $value ) {
+ if ( $value === null ) {
+ unset( $this->mExtensionData[$key] );