Swoole built environment, when to be a small notes, manuals:
https://linkeddestiny.gitbooks.io/easy-swoole/content/book/chapter01/install.html
Related command:
sudo vim ~/.bashrc
Increase at the end of the file:
export PATH=/usr/local/php/bin:$PATH
export PATH=/usr/local/php/sbin:$PATH
After saving reload it
source ~/.bashrc
Note: The directory needs to be php corresponding executable file directory