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If you’ve ever worked with WordPress themes or plugins, you’ve likely seen the add_filter() function used in code. This function is a powerful tool for modifying data before it’s displayed on the front-end of a website.

Essentially, the add_filter() function can be used to "filter" the output of a particular WordPress function or variable. It allows developers to modify the output of that function or variable by "hooking" into it and running additional code.

Here’s an example of how add_filter() might be used:

Let’s say we want to modify the text that appears in the WordPress footer. We could achieve this using the wp_footer filter. Here’s how the code might look:

function my_custom_footer_text() {
    return 'Copyright © 2021 My Website';
add_filter( 'wp_footer', 'my_custom_footer_text' );

In this example, we’re creating a new function called my_custom_footer_text() that simply returns the text we want to display in the footer. We then use the add_filter() function to "hook" into the wp_footer function and modify its output by calling our custom function.

So when WordPress outputs the footer on the front-end of the website, it will now display our custom text instead of the default “Powered by WordPress” message.

Overall, add_filter() is a powerful function that allows developers to modify the behavior of WordPress functions and variables without having to modify the core WordPress code.

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