WordPress add query string to URL

To add a query string to a URL in WordPress, follow these steps:

1. Open the WordPress theme's functions.php file.
2. Use the add_query_arg() function to add a query string parameter to the URL.
3. Save the changes to the functions.php file.
4. Use the get_permalink() function to retrieve the modified URL with the added query string.

Example code:

// Step 1: Open the functions.php file

// Step 2: Use add_query_arg() to add a query string parameter
function add_query_string_to_url($url) {
    $new_url = add_query_arg('your_parameter', 'parameter_value', $url);
    return $new_url;
}

// Step 3: Save the changes to functions.php

// Step 4: Use get_permalink() to retrieve the modified URL
$original_url = get_permalink();
$modified_url = add_query_string_to_url($original_url);

Replace 'your_parameter' with the desired parameter name and 'parameter_value' with the desired value.