REST API: Protect against fatal error for post types without format support.

Ignore the `format` parameter introduced in WordPress 6.7 for post types that do not support post formats. This protects against a fatal error being thrown in later version of PHP or a warning in earlier versions of PHP.

Follow up to r59115.

Reviewed by jorbin.
Merges [59544] to the 6.7 branch.

Props dd32, sergeybiryukov, yogeshbhutkar.
Fixes #62646.
See #62014.



git-svn-id: https://develop.svn.wordpress.org/branches/6.7@59744 602fd350-edb4-49c9-b593-d223f7449a82

Author: peterwilsoncc

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

@@ -346,7 +346,7 @@ public function get_items( $request ) {
 
 		$args = $this->prepare_tax_query( $args, $request );
 
-		if ( ! empty( $request['format'] ) ) {
+		if ( isset( $registered['format'], $request['format'] ) ) {
 			$formats = $request['format'];
 			/*
 			 * The relation needs to be set to `OR` since the request can contain

tests/phpunit/tests/rest-api/rest-posts-controller.php

@@ -5507,6 +5507,45 @@ public function test_draft_post_does_not_have_the_same_slug_as_existing_post() {
 		);
 	}
 
+	/**
+	 * Test the REST API ignores the post format parameter for post types that do not support them.
+	 *
+	 * @ticket 62646
+	 * @ticket 62014
+	 *
+	 * @covers WP_REST_Posts_Controller::get_items
+	 */
+	public function test_standard_post_format_ignored_for_post_types_that_do_not_support_them() {
+		$initial_theme_support = get_theme_support( 'post-formats' );
+		add_theme_support( 'post-formats', array( 'aside', 'gallery', 'link', 'image', 'quote', 'status', 'video', 'audio', 'chat' ) );
+
+		self::factory()->post->create(
+			array(
+				'post_type'   => 'page',
+				'post_status' => 'publish',
+			)
+		);
+
+		$request = new WP_REST_Request( 'GET', '/wp/v2/pages' );
+		$request->set_param( 'format', 'invalid_type' );
+
+		$response = rest_get_server()->dispatch( $request );
+
+		/*
+		 * Restore the initial post formats support.
+		 *
+		 * This needs to be done prior to the assertions to avoid unexpected
+		 * results for other tests should an assertion fail.
+		 */
+		if ( $initial_theme_support ) {
+			add_theme_support( 'post-formats', $initial_theme_support[0] );
+		} else {
+			remove_theme_support( 'post-formats' );
+		}
+
+		$this->assertCount( 1, $response->get_data(), 'The response should ignore the post format parameter' );
+	}
+
 	/**
 	 * Test the REST API support for the standard post format.
 	 *