REST API: Restore is_array() check in rest_convert_error_to_response()

src/wp-includes/rest-api.php

@@ -3427,8 +3427,15 @@ function rest_get_endpoint_args_for_schema( $schema, $method = WP_REST_Server::C
 function rest_convert_error_to_response( $error ) {
 	$status = array_reduce(
 		$error->get_all_error_data(),
-		static function ( $status, $error_data ) {
-			return $error_data['status'] ?? $status;
+		/**
+		 * @param int   $status     Status.
+		 * @param mixed $error_data Error data.
+		 */
+		static function ( int $status, $error_data ): int {
+			if ( is_array( $error_data ) && isset( $error_data['status'] ) && is_numeric( $error_data['status'] ) ) {
+				$status = (int) $error_data['status'];
+			}
+			return $status;
 		},
 		500
 	);

tests/phpunit/tests/rest-api/rest-server.php

@@ -592,6 +592,33 @@ public function test_error_to_response_with_additional_data() {
 		$this->assertSame( array( array( 'status' => 400 ) ), $response->get_data()['additional_data'] );
 	}
 
+	/**
+	 * @ticket 64901
+	 */
+	public function test_error_to_response_with_stdclass_data() {
+		$error = new WP_Error( 'test', 'test', (object) array( 'status' => 400 ) );
+
+		$response = rest_convert_error_to_response( $error );
+		$this->assertInstanceOf( WP_REST_Response::class, $response );
+
+		// stdClass data should not cause a fatal, status should default to 500.
+		$this->assertSame( 500, $response->get_status() );
+	}
+
+	/**
+	 * @ticket 64901
+	 */
+	public function test_error_to_response_with_multi_status_non_numeric_status() {
+		$error = new WP_Error( 'test', 'test', array( 'status' => array( 'feeling' => 'happy' ) ) );
+		$error->add_data( array( 'status' => 400 ), 'test' );
+		$error->add_data( array( 'status' => array( 'feeling' => 'bleh' ) ), 'test' );
+
+		$response = rest_convert_error_to_response( $error );
+		$this->assertInstanceOf( WP_REST_Response::class, $response );
+
+		$this->assertSame( 400, $response->get_status() );
+	}
+
 	public function test_rest_error() {
 		$data     = array(
 			'code'    => 'wp-api-test-error',