Understanding Hooks (Actions and Filters)

[Emmanuel N]

Hooks in WordPress allow you to change how your site works without touching core files. If you want deeper control over themes and plugins, you need to understand Actions and Filters.

1. What WordPress hooks are

Hooks are connection points where you attach your own code to WordPress.

Two types:

• Actions — run code at specific moments
• Filters — modify existing data

2. WordPress Actions

Actions let you add functionality.

Use actions when you want to:

• Add HTML to a page
• Run background tasks
• Load scripts or styles

Example:

function alex_custom_footer() {
  echo '<p>Powered by my site</p>';
}
add_action('wp_footer', 'alex_custom_footer');

This inserts content into the footer.

3. WordPress Filters

Filters modify data before output.

Use filters when you want to:

• Change titles
• Modify content
• Adjust excerpts
• Alter output text

Example:

function alex_prefix_title($title) {
  return '★ ' . $title;
}
add_filter('the_title', 'alex_prefix_title');

This edits post titles before display.

4. Where to place your hook code

Best practice locations:

• Custom plugin (preferred)
• Child theme functions.php

Do not edit WordPress core files.

5. Common mistakes

• Forgetting to return data in filters
• Using the wrong hook name
• Adding code to parent theme
• Hooking too early or too late

6. Why hooks matter

Hooks help you:

• Extend WordPress safely
• Keep updates working
• Build scalable custom features
• Avoid core file edits

 

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