What is the purpose of setting up Crontab and SAPI CLI in PHP?

Setting up Crontab and SAPI CLI in PHP allows you to automate tasks and run PHP scripts at specific intervals without user intervention. Crontab is a time-based job scheduler in Unix-like operating systems, while SAPI CLI (Server API Command Line Interface) allows you to run PHP scripts from the command line.

// Example PHP script to be run via Crontab or SAPI CLI
echo "Hello, world!";