php-I | grep with-gd to see if you have gd when compiling and installing php
if not, reinstall gd with phpize

1. About the difference between gd and gd2, you can join the following link. To put it simply, gd2 is an updated version of gd, which can handle more image types
https://stackoverflow.com/que.
2. Gd and gd2, are already included in php-gd. If you installed a new version of php-gd, you should have already installed it, or check out the following version of your GD library

<?php
var_dump(gd_info());
?>

the version I show is 2.1.1, including GD2

3composer require topthink/think-worker

:
4"phpcliphpphp.iniphpinfo()PHP CLI"

php-cliphpphp -vphpphp-cliapahcenginx