Polyfill
PHP 8 string functions on PHP 7.2+, WordPress hook stubs, and translation/escaping passthroughs so toolkit code runs without booting WordPress.
composer require wp-php-toolkit/polyfillA lot of WordPress-adjacent code wants to call esc_html(), __(), or apply_filters() without booting WordPress. The polyfill component provides minimal implementations for the subset used by the toolkit, and stays out of the way when WordPress is loaded (every function uses function_exists() guards).
PHP 8 string functions on PHP 7.2
The polyfills define str_contains, str_starts_with, str_ends_with, and array_key_first only when missing.
Escaping and translation stubs
Pass-through implementations let you write code that looks WordPressy and runs anywhere.
A simple filter chain
The hook system implements the common filter path: registered callbacks get applied in priority order, and each one transforms the running value.
Priority ordering and multi-arg passing
Lower priority numbers run first. The fourth argument to add_filter controls how many context values get passed to the callback.
Hook-based extension points in standalone libraries
Use do_action and apply_filters as cheap extension points in your own code, without depending on WordPress.