Code Modernization: Rename parameters that use reserved keywords in wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.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 `$parent` to `$parent_post` in `WP_REST_Revisions_Controller::get_parent()`.

Follow-up to [52946], [52996], [52997], [52998], [53003], [53014], [53029], [53039], [53116], [53117], [53137], [53174], [53184], [53185], [53192], [53193], [53198], [53203], [53207], [53215], [53216], [53220], [53230], [53232], [53236], [53239], [53240], [53242], [53243], [53245], [53246], [53257], [53269], [53270], [53271], [53272], [53273], [53274], [53275], [53276], [53277], [53281], [53283], [53284], [53285], [53287], [53364], [53365], [54927], [54929], [54930], [54931], [54932], [54933], [54938], [54943], [54944], [54945], [54946], [54947], [54948], [54950], [54951], [54952], [54956], [54959], [54960], [54961], [54962], [54964], [54965], [54969].

Props jrf, aristath, poena, justinahinon, SergeyBiryukov.
See #56788.

git-svn-id: https://develop.svn.wordpress.org/trunk@54970 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php

@@ -134,25 +134,29 @@ public function register_routes() {
 	 *
 	 * @since 4.7.2
 	 *
-	 * @param int $parent Supplied ID.
+	 * @param int $parent_post Supplied ID.
 	 * @return WP_Post|WP_Error Post object if ID is valid, WP_Error otherwise.
 	 */
-	protected function get_parent( $parent ) {
+	protected function get_parent( $parent_post ) {
 		$error = new WP_Error(
 			'rest_post_invalid_parent',
 			__( 'Invalid post parent ID.' ),
 			array( 'status' => 404 )
 		);
-		if ( (int) $parent <= 0 ) {
+
+		if ( (int) $parent_post <= 0 ) {
 			return $error;
 		}
 
-		$parent = get_post( (int) $parent );
-		if ( empty( $parent ) || empty( $parent->ID ) || $this->parent_post_type !== $parent->post_type ) {
+		$parent_post = get_post( (int) $parent_post );
+
+		if ( empty( $parent_post ) || empty( $parent_post->ID )
+			|| $this->parent_post_type !== $parent_post->post_type
+		) {
 			return $error;
 		}
 
-		return $parent;
+		return $parent_post;
 	}
 
 	/**