Xdebug — Step Debugger and Debugging Aid for PHP
A teaching project for a 4-role library system: admin, librarian, student, visitor. Written in plain PHP with procedural mysqli and prepared statements. No frameworks, no Composer, no build step. Copy it into XAMPP and it runs.
A piplet is a way of life, a reminder we can always improve ourselves. It's also a self-modifying PHP (more languages possible) script that stores its data in the PHP code itself. There is no database, package install, build step, or network dependency.