Laravel’s Tinker quits immediately on PHP 7.3 & Mac

I had a weird issue with Laravel’s Tinker artisan command. Every time I would load it up and type a command, it would immediately quit.

$ php artisan tinker
Psy Shell v0.9.9 (PHP 7.3.8 — cli) by Justin Hileman
>>> Str::plural('url', 1);

$ 

It would just jump straight back my terminal prompt.

The fix appears to be to add a custom config that instructs PsySH – on which Tinker is built – to not use PHP’s pcntl extension for process control.

$ cat ~/.config/psysh/config.php
<?php
return [
  'usePcntl' => false,
];

That one did the tricky for me.

$ php artisan tinker
Psy Shell v0.9.9 (PHP 7.3.8 — cli) by Justin Hileman
>>> Str::plural('url', 1);
=> "url"
>>> Str::plural('url', 2);
=> "urls"

Hope this saves you some headaches!