{
  "id": 15522604,
  "title": "WordPress Hooks Explained: How Plugins and Themes Extend Core Without Editing It",
  "url": "https://urgent.news/2026/10/19/wordpress-hooks-explained-how-plugins-and-themes-extend-core-without",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-10-19T00:18:56.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/susumun/wordpress-hooks-explained-how-plugins-and-themes-extend-core-without-editing-it-3pef"
  },
  "original_language": "en",
  "account": "WordPress plugins and themes extend the core functionality without altering its source code by utilizing hooks. There are two types of hooks: actions and filters. Actions allow you to run custom code at specific points in WordPress, while filters enable you to modify existing values before they are used by WordPress.\n\nWordPress core has built-in hook points where plugins and themes can attach their own functions. These hooks work in two ways: actions and filters. Actions are used for performing side effects, like writing logs or making requests. Filters, on the other hand, are used for altering data that WordPress is about to use or display.\n\nA filter example is changing the excerpt length on archive pages. By registering a function on the excerpt_length filter hook, you can set the excerpt length to 60 words instead of the default 55. This function receives the default value from WordPress as an argument and returns the new length.\n\nAn action example is pre-generating an Open Graph image when a post is saved or published. The save_post action is hooked using the add_action function, specifying the priority and the number of arguments the callback expects. In this case, the callback function receives three arguments: $post_ID, $post, and $update. The priority allows you to determine the order in which callbacks are executed.\n\nHooks provide a way for WordPress to intercept and modify its functionality without modifying the core files directly. When WordPress is updated, customizations made through hooks remain intact, as they are stored in separate files under wp-content/themes or wp-content/plugins directories. This mechanism allows for seamless collaboration between WordPress core, plugins, and themes without the risk of losing customizations during updates.",
  "summary": "WordPress plugins and themes change what gets displayed and how data gets processed without ever touching WordPress core's own files (the code under wp-includes / wp-admin ). What makes that possible is a mechanism called hooks , which come in two flavors: actions and filters . This blog's own theme, wpmm-blog , uses both extensively in its functions.php , so this article walks through real code…",
  "key_points": [
    "WordPress plugins and themes use hooks to extend core functionality without altering source code.",
    "Hooks come in two types: actions, for performing side effects, and filters, for altering data."
  ],
  "editors_take": "Utilizing actions and filters allows developers to customize site behavior without touching core files, ensuring that essential modifications survive future software updates through a decoupled architecture.",
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}