Hooks - v1.1.0

Hooks (both actions and filters) run callbacks in ascending priority order. Lower numbers are executed first. Callbacks with the same priority run in the order they were added.

See also: [[Actions]] and [[Filters]].

How Priorities Work

• Default priority is 10.
• Smaller numbers run earlier; larger numbers run later.
• When priorities are equal, callbacks execute FIFO (first added, first run).

Example (Actions)

addAction('order.placed', fn () => logger('A: priority 5'), 5);
addAction('order.placed', fn () => logger('B: priority 10'));
addAction('order.placed', fn () => logger('C: priority 20'), 20);

Execution order: A, B, C.

Example (Filters)

addFilter('title.display', fn ($title) => strtoupper($title), 5);
addFilter('title.display', fn ($title) => $title.'!');

$result = applyFilters('title.display', 'Hello');
// 'HELLO!'

Tips

• Reserve low numbers (e.g., 1–5) for foundational work.
• Keep defaults at 10 for most extensions.
• Use higher numbers (20+) for "final touches".

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