WP_REST_Posts_Controller::get_post( int $id ): WP_Post|WP_Error

Source

protected function get_post( $id ) {
	$error = new WP_Error(
		'rest_post_invalid_id',
		__( 'Invalid post ID.' ),
		array( 'status' => 404 )
	);

	if ( (int) $id <= 0 ) {
		return $error;
	}

	$post = get_post( (int) $id );
	if ( empty( $post ) || empty( $post->ID ) || $this->post_type !== $post->post_type ) {
		return $error;
	}

	return $post;
}

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