Code Modernization: Rename parameters that use reserved keywords in wp-admin/includes/class-theme-upgrader.php.

While using reserved PHP keywords as parameter name labels is allowed, in the context of function calls using named parameters in PHP 8.0+, this will easily lead to confusion. To avoid that, it is recommended not to use reserved keywords as function parameter names.

This commit renames the `$return` variable in `Theme_Upgrader` class methods to `$response` and updates the documentation accordingly.

Follow-up to [47409], [52946], [52996], [52997].

Props jrf, aristath, poena, justinahinon, SergeyBiryukov.
See #55327.

git-svn-id: https://develop.svn.wordpress.org/trunk@52998 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-admin/includes/class-theme-upgrader.php

@@ -616,28 +616,28 @@ public function check_package( $source ) {
 	 *
 	 * @since 2.8.0
 	 *
-	 * @param bool|WP_Error $return Upgrade offer return.
-	 * @param array         $theme  Theme arguments.
-	 * @return bool|WP_Error The passed in $return param or WP_Error.
+	 * @param bool|WP_Error $response The installation response before the installation has started.
+	 * @param array         $theme    Theme arguments.
+	 * @return bool|WP_Error The original `$response` parameter or WP_Error.
 	 */
-	public function current_before( $return, $theme ) {
-		if ( is_wp_error( $return ) ) {
-			return $return;
+	public function current_before( $response, $theme ) {
+		if ( is_wp_error( $response ) ) {
+			return $response;
 		}
 
 		$theme = isset( $theme['theme'] ) ? $theme['theme'] : '';
 
-		// Only run if active theme
+		// Only run if active theme.
 		if ( get_stylesheet() !== $theme ) {
-			return $return;
+			return $response;
 		}
 
 		// Change to maintenance mode. Bulk edit handles this separately.
 		if ( ! $this->bulk ) {
 			$this->maintenance_mode( true );
 		}
 
-		return $return;
+		return $response;
 	}
 
 	/**
@@ -648,20 +648,20 @@ public function current_before( $return, $theme ) {
 	 *
 	 * @since 2.8.0
 	 *
-	 * @param bool|WP_Error $return Upgrade offer return.
-	 * @param array         $theme  Theme arguments.
-	 * @return bool|WP_Error The passed in $return param or WP_Error.
+	 * @param bool|WP_Error $response The installation response after the installation has finished.
+	 * @param array         $theme    Theme arguments.
+	 * @return bool|WP_Error The original `$response` parameter or WP_Error.
 	 */
-	public function current_after( $return, $theme ) {
-		if ( is_wp_error( $return ) ) {
-			return $return;
+	public function current_after( $response, $theme ) {
+		if ( is_wp_error( $response ) ) {
+			return $response;
 		}
 
 		$theme = isset( $theme['theme'] ) ? $theme['theme'] : '';
 
 		// Only run if active theme.
 		if ( get_stylesheet() !== $theme ) {
-			return $return;
+			return $response;
 		}
 
 		// Ensure stylesheet name hasn't changed after the upgrade:
@@ -675,7 +675,7 @@ public function current_after( $return, $theme ) {
 		if ( ! $this->bulk ) {
 			$this->maintenance_mode( false );
 		}
-		return $return;
+		return $response;
 	}
 
 	/**