PHP Artisan Tinker crashing from any command
If you are using PHP 7.3 installed by homebrew on Mojave, try creating a config file at ~/.config/psysh/config.php if not already there:
<?phpreturn [ 'usePcntl' => false,]; Source: https://github.com/bobthecow/psysh/issues/540#issuecomment-446480753
This happens on Mojave when you upgrade/install PHP 7.3 using homebrew, (It's a problem with PsySh (used by Tinker) and Homebrew's PHP 7.3.0 build.)
Simple solution is, In your php.ini set
pcre.jit=0
If you don't know which ini file is used, you can run php --ini to find it,
# /usr/local/etc/php/7.3/php.ini- ;pcre.jit=1+ pcre.jit=0