Jokes aside, Laravel is probably a more likely contender to provide a Rails experience for PHP.
And it's easy to get clouded by anecdotal data, I'm sure I'm biased as well. But after some time in the industry, it matters more who the person is that is using the framework, than the framework itself. If you put an equally skilled developer with the same amount of experience in either Symfony or Rails, I'm sure they can be as productive as the other. But then skilled developers tend to gravitate towards Rails more than Symfony, so hard to judge in the real world.
Jokes aside, Laravel is probably a more likely contender to provide a Rails experience for PHP.
And it's easy to get clouded by anecdotal data, I'm sure I'm biased as well. But after some time in the industry, it matters more who the person is that is using the framework, than the framework itself. If you put an equally skilled developer with the same amount of experience in either Symfony or Rails, I'm sure they can be as productive as the other. But then skilled developers tend to gravitate towards Rails more than Symfony, so hard to judge in the real world.