How could you include a custom function for every single time PHP runs?

October 26, 2018

There are probably a few ways to do this, but one simple way would be to put your function in a file in /somedir/something.php. Then update php.ini and set auto_prepend_file = /somedir/something.php.

If you want to use a package (via composer) on all of your scripts you could also do something like composer global require THEPACKAGE/NAMEHERE, then do auto_prepend_file = ${HOME}/.composer/vendor/autoload.php

I would not recommend doing this though! The setup will work only on your current machine, and would cause problems with debugging or getting your scripts to work the same on other machines. I have very rarely used auto_prepend_file, and every time I have it has caused problems with deployment to other servers or for testing.