Function and usage of ms_not_installed() in wordpress


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    The ms_not_installed() function in WordPress is specifically used in a multisite environment. Here's a detailed explanation and sample usage:


    ms_not_installed( string $domain, string $path )


    This function displays a failure message. It is typically used in WordPress multisite installations when a blog's tables do not exist in the database. The function also checks for a missing $wpdb->site table, which is essential in a multisite setup. This check helps ensure the integrity of the multisite network and aids in diagnosing installation or configuration issues.


    1. $domain (string - required): This parameter refers to the domain of the site that is encountering the error. It's used to specify which domain the error message should reference, providing clarity in a multisite environment where multiple domains are in use.

    2. $path (string - required): This parameter is the path of the site within the multisite network that is experiencing the issue. Similar to the domain, this helps in pinpointing the exact location within the network where the problem exists.

    Usage Example:

    In a practical scenario, you might not directly use ms_not_installed() in your code. It's more of a diagnostic tool used internally by WordPress during the setup and maintenance of a multisite network. However, a hypothetical usage could look like this:

    if ( some_condition_check_fails() ) {
        ms_not_installed( '', '/blog1/' );

    In this example, if a certain condition fails (perhaps related to the site's database tables or network configuration), the ms_not_installed() function is called. It displays an error message specific to the domain '' and the path '/blog1/', which is helpful in troubleshooting in a multisite environment.

    Remember, this function is part of WordPress's core functionality and is typically triggered by the system itself when it detects a specific type of configuration or installation problem in a multisite setup.

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