sticky_header() function when the wp_footer action hook is called. You can also attach the function to a specific hook by replacing wp_footer with the hook name of your choice.
For example:
add_action( 'init', 'sticky_header' );
This will run the sticky header function when the WordPress initialization action is called.
Filter Hooks
Filter hooks allow you to modify data before it is displayed or saved to the database. Below is an example of a filter hook that changes the title of a blog post to all uppercase.
add_filter( ‘the_title’, ‘uppercase_title’ );
function uppercase_title( $title ) {
return strtoupper( $title );
}
This function accepts one parameter, $title, which is the original title of the blog post.
The function then uses the function strtoupper() to convert the title case to upper case and returns the modified value.
Difference between action hooks and filter hooks
Action hooks allow you to execute custom functions at specific times in the WordPress runtime. In the example above, the action hook wp_footer is called before the tag.
Filter hooks, on the other hand, allow you to modify data that is passed through the WordPress codebase.
As shown in the example above, the filter hook title allows you to edit the title of a blog post before it is displayed on the site.
Step 2: Set up the test environment
The second step in creating a WordPress plugin is to set up a testing or development e