How to use http_headers_useragent filter in WordPress

Hey there! Working with WordPress hooks can be quite an adventure, right? Today, we are diving into the fascinating world of the http_headers_useragent filter. This handy hook allows you to filter the user agent value sent with an HTTP request. Let’s explore how you can use it effectively!

Live Example 1: Modifying User Agent

Here’s a simple example to get you started. In this scenario, we modify the user agent value based on specific requirements.

    function weplugins_modify_http_headers_useragent_defaults($user_agent, $url) {
        // Update the $user_agent variable according to your website requirements and return this variable.
        return $user_agent; 
    }
    // add the filter
    add_filter("http_headers_useragent", "weplugins_modify_http_headers_useragent_defaults", 10, 2);
    

Live Example 2: Removing a Filter

Sometimes, you might want to remove a filter that has been previously added. Here’s how you can do that.

    remove_filter("http_headers_useragent", "weplugins_modify_http_headers_useragent_defaults", 10, 2);
    

Ensure you provide the same callback function name, priority, and number of arguments when removing the hook callback.

Live Example 3: Conditional User Agent Modification

This example demonstrates how you can modify the user agent conditionally, depending on the URL or other parameters.

    function weplugins_conditional_http_headers_useragent($user_agent, $url) {
        if (strpos($url, 'special-condition') !== false) {
            $user_agent = 'CustomUserAgent';
        }
        return $user_agent;
    }
    add_filter("http_headers_useragent", "weplugins_conditional_http_headers_useragent", 10, 2);
    

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