gistfile1.txt

<?php
	public function isMember(Project $project)
	{
		if($project->owner instanceof Organization) {

			foreach($project->owner->users() as $user) {
				if($user->id === $this->id) {
					return true;
				}
			}

		} elseif($project->owner instanceof User) {
			if($project->owner->id === $this->id) {
				return true;
			}
		} else {
			throw new Exception("Project doesn't have an owner.");
		}

		return false;
	}