Filter – what this expression in WordPress mean?

In WordPress, a “filter” is a type of hook that allows you to modify the output of a function or a value before it is displayed on the frontend of your site. Filters are a powerful tool for customizing the behavior of your WordPress site, as they allow you to modify the content and data that is displayed to your users.

For example, you can use filters to modify the text of a post before it is displayed on your site, to change the length of an excerpt, or to modify the HTML output of a widget. Filters are used to modify the output of WordPress functions and allow you to change the behavior of your site without having to modify the underlying code.

To use filters, you need to write a function that specifies the changes you want to make and then hook that function to the appropriate filter hook. Once your function is hooked to the filter, it will be executed whenever the filter is called, and the output of the function will be used instead of the original value.

It’s important to note that filters are a complex aspect of WordPress development, and they should be used with caution, as they can easily break your site if used improperly. Before using filters, it’s a good idea to familiarize yourself with the WordPress coding standards, and to understand the functions and values you’re modifying.

Overall, filters are a powerful tool for customizing the behavior of your WordPress site, and they can be used to achieve a wide range of customizations, from simple text modifications to complex data transformations. Whether you’re a developer or a power user, filters are a must-have tool in your WordPress toolkit.