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Reference

WordPress Reference

The things you look up rather than read. Accurate, current, and built to be cited.

Some WordPress details have to be exactly right: the name and arguments of a hook, the template file a block theme picks for a given page, the pixel size of each image WordPress creates. These pages gather those facts in one place, with examples, so you can check a detail in seconds instead of searching through core code.

WordPress Hooks Index

Every hook worth knowing, with the signature and the gotcha

A searchable WordPress hooks list covering the actions and filters developers actually use — with the exact add_action/add_filter signature, when it fires, a working example, and the thing that bites people.

63 hooks

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WordPress Block Theme Template Hierarchy

Which template file wins, in a block theme

The full block-theme (FSE) template hierarchy: for every request type, the ordered list of templates WordPress looks for, most specific first, falling back to index.html. The block-era equivalent of the classic hierarchy chart.

16 page types

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WordPress Image Sizes Cheat Sheet

Every size WordPress registers, what crops, and what to actually upload

The definitive reference for WordPress image sizes: every registered size and its real dimensions, which ones hard-crop, the 2560px -scaled threshold, WooCommerce sizes, and what to upload for each purpose.

9 image sizes

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Who uses these

Theme and plugin developers who need a hook signature or a template name, site owners working out why an image looks soft or which template a page uses, and writers who want an accurate page to link to.

Reference, tool or guide?

  • Reference pages: look up an exact fact, such as a hook, a template or an image size.
  • Tools: enter your own values and get a ready-to-use result, such as wp-config.php settings or .htaccess rules. Tools
  • Guides: step-by-step fixes for one specific problem, such as a white screen or blurry images. Guides

Every reference here is backed by a real dataset, published as free JSON and CSV under CC BY 4.0 — no key, no rate limit. Take the data →