diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/class-wp-http-ixr-client.php
--- a/wp/wp-includes/class-wp-http-ixr-client.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/class-wp-http-ixr-client.php	Tue Dec 15 13:49:49 2020 +0100
@@ -13,21 +13,21 @@
 	public $error;
 
 	/**
-	 * @param string $server
+	 * @param string      $server
 	 * @param string|bool $path
-	 * @param int|bool $port
-	 * @param int $timeout
+	 * @param int|bool    $port
+	 * @param int         $timeout
 	 */
 	public function __construct( $server, $path = false, $port = false, $timeout = 15 ) {
 		if ( ! $path ) {
-			// Assume we have been given a URL instead
+			// Assume we have been given a URL instead.
 			$bits         = parse_url( $server );
 			$this->scheme = $bits['scheme'];
 			$this->server = $bits['host'];
 			$this->port   = isset( $bits['port'] ) ? $bits['port'] : $port;
 			$this->path   = ! empty( $bits['path'] ) ? $bits['path'] : '/';
 
-			// Make absolutely sure we have a path
+			// Make absolutely sure we have a path.
 			if ( ! $this->path ) {
 				$this->path = '/';
 			}
@@ -46,10 +46,13 @@
 	}
 
 	/**
+	 * @since 3.1.0
+	 * @since 5.5.0 Formalized the existing `...$args` parameter by adding it
+	 *              to the function signature.
+	 *
 	 * @return bool
 	 */
-	public function query() {
-		$args    = func_get_args();
+	public function query( ...$args ) {
 		$method  = array_shift( $args );
 		$request = new IXR_Request( $method, $args );
 		$xml     = $request->getXml();
@@ -62,7 +65,7 @@
 			'body'       => $xml,
 		);
 
-		// Merge Custom headers ala #8145
+		// Merge Custom headers ala #8145.
 		foreach ( $this->headers as $header => $value ) {
 			$args['headers'][ $header ] = $value;
 		}
@@ -76,11 +79,11 @@
 		 */
 		$args['headers'] = apply_filters( 'wp_http_ixr_client_headers', $args['headers'] );
 
-		if ( $this->timeout !== false ) {
+		if ( false !== $this->timeout ) {
 			$args['timeout'] = $this->timeout;
 		}
 
-		// Now send the request
+		// Now send the request.
 		if ( $this->debug ) {
 			echo '<pre class="ixr_request">' . htmlspecialchars( $xml ) . "\n</pre>\n\n";
 		}
@@ -103,21 +106,21 @@
 			echo '<pre class="ixr_response">' . htmlspecialchars( wp_remote_retrieve_body( $response ) ) . "\n</pre>\n\n";
 		}
 
-		// Now parse what we've got back
+		// Now parse what we've got back.
 		$this->message = new IXR_Message( wp_remote_retrieve_body( $response ) );
 		if ( ! $this->message->parse() ) {
-			// XML error
+			// XML error.
 			$this->error = new IXR_Error( -32700, 'parse error. not well formed' );
 			return false;
 		}
 
 		// Is the message a fault?
-		if ( $this->message->messageType == 'fault' ) {
+		if ( 'fault' === $this->message->messageType ) {
 			$this->error = new IXR_Error( $this->message->faultCode, $this->message->faultString );
 			return false;
 		}
 
-		// Message must be OK
+		// Message must be OK.
 		return true;
 	}
 }