Function and usage of ms_load_current_site_and_network() in wordpress

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    2024-01-08T22:48:40+00:00

    The ms_load_current_site_and_network() function in WordPress plays a critical role in the multisite network feature. Here's a detailed explanation of the function, including its purpose, description, parameters, and return values:

    Function

    ms_load_current_site_and_network( string $domain, string $path, bool $subdomain = false ): bool|string

    Purpose

    • Identifies the Network and Site: This function is used to determine the specific network and site within a WordPress multisite installation based on the requested domain and path.
    • Populates Global Objects: As part of the multisite bootstrap process, it fills the global objects corresponding to the network and site.

    Description

    • History: Before WordPress version 4.6.0, the functionality of this function existed as a procedural block within ms-settings.php. It was later encapsulated into a function primarily to aid in unit testing.
    • Core Usage: It is an internal function intended for use within the core WordPress code and should not be used outside of it.
    • Process Order: Typically, querying the site first is easier, as it automatically declares its network. However, in certain scenarios, identifying the network first is either possible or necessary.
    • Response Logic: If both a network and site are successfully found, the function returns true, allowing the request to proceed. If neither is found, it returns false or a URL string, indicating either an error condition or the need for a redirect.

    Parameters

    1. $domain (string, required): The domain of the requested site.
    2. $path (string, required): The path of the requested site.
    3. $subdomain (bool, optional): Specifies the type of multisite configuration:
      • true for subdomain configurations.
      • false for subdirectory configurations (default).

    Return Values

    • True: Indicates successful bootstrap and population of $current_blog and $current_site globals.
    • False: Indicates failure to complete the bootstrap process properly.
    • URL String: Returned if parts of the request are valid, but it cannot be fulfilled as a whole, typically leading to a redirect.

    Sample Usage

    Here's a hypothetical example of how ms_load_current_site_and_network() might be used internally:

    // Hypothetical usage within WordPress core
    $domain = $_SERVER['HTTP_HOST'];
    $path = $_SERVER['REQUEST_URI'];
    $subdomain = is_subdomain_install(); // Determine the multisite configuration
    
    $result = ms_load_current_site_and_network($domain, $path, $subdomain);
    
    if ($result === true) {
        // Continue with the request as network and site are identified
    } elseif (is_string($result)) {
        // Redirect to the URL specified in the result
        wp_redirect($result);
        exit;
    } else {
        // Handle the error scenario
        wp_die('Multisite network or site could not be identified.');
    }
    

    In this example, the function is used to determine the correct network and site based on the current request's domain and path. Depending on the function's return value, the script either proceeds with the request, performs a redirect, or handles an error scenario.

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