Tinker exit unexpectedly whatever you enter in it.
with php7.3, it exit when I type:
$ php artisan tinker
Psy Shell v0.9.9 (PHP 7.3.0 — cli) by Justin Hileman
>>> $test = 'eee';
$
with php7.2, it is ok:
$ php artisan tinker
Psy Shell v0.9.9 (PHP 7.2.12-1+0~20181112102304.11+stretch~1.gbp55f215 — cli) by Justin Hileman
>>> $test = 'eee';
=> "eeee"
tested with an other version of laravel as well (5.7.15)
more info on my php version:
php -v
PHP 7.3.0 (cli) (built: Dec 7 2018 11:00:11) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.0-dev, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.3.0, Copyright (c) 1999-2018, by Zend Technologies
Heya. Please use the issue tracker on the Tinker repo to report issues with Tinker. Also see https://github.com/laravel/tinker/issues/63
when update to php 7.3.0 tinker exit unexpectedly
please help me
tnx

Search the issues here. This has been discussed.
If you are using Mac OS Mojave and PHP 7.3.x installed with homebrew, here is a fix:
https://stackoverflow.com/a/53826601/2840335
Most helpful comment
If you are using Mac OS Mojave and PHP 7.3.x installed with homebrew, here is a fix:
https://stackoverflow.com/a/53826601/2840335