How to get the home directory from a PHP CLI script?

Question

From the command line, I can get the home directory like this:

~/

How can I get the home directory inside my PHP CLI script?

Answer 1

$_SERVER['HOME'] and getenv('home') did not work for me.

However, on PHP 5.5+, this worked to give the home directory that the file is located in:

explode( '/', __FILE__ )[2]