Function and usage of is_user_option_local() in wordpress

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    2024-01-09T00:16:02+00:00

    The is_user_option_local() function in WordPress is used to check if a given user meta key is specific to the current blog in a multisite network. This function is particularly useful in WordPress multisite environments where you have multiple blogs or sites under one WordPress installation.

    Function Signature:

    is_user_option_local( string $key, int $user_id, int $blog_id ): bool
    

    Parameters:

    1. $key (string, required): The user meta key to check. This is the name of the user option you want to verify.
    2. $user_id (int, optional): The ID of the user whose meta key you want to check. If not provided, it defaults to the current user.
    3. $blog_id (int, optional): The ID of the blog to check the meta key against. If not provided, it defaults to the current blog in the multisite network.

    Return Value:

    • bool: Returns true if the user meta key is specific to the current blog, false otherwise.

    Usage Scenario:

    Imagine you are managing a WordPress multisite network with multiple blogs, and you have user meta options that are specific to each blog. You can use is_user_option_local() to determine if a particular user meta option is specific to a certain blog or if it's a global option across all blogs.

    Sample Usage:

    Here's an example of how you might use is_user_option_local():

    // Set the key, user ID, and blog ID
    $key = 'user_preference';
    $user_id = 1; // Replace with the actual user ID
    $blog_id = 2; // Replace with the actual blog ID
    
    // Check if the user option is local to the current blog
    if ( is_user_option_local( $key, $user_id, $blog_id ) ) {
        echo 'This user option is specific to the current blog.';
    } else {
        echo 'This user option is not specific to the current blog.';
    }
    

    In this example, the function checks whether the user option 'user_preference' for user with ID 1 is specific to blog with ID 2. If the option is local to the specified blog, it prints a message accordingly, and vice versa.

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