Function and usage of iis7_delete_rewrite_rule() in wordpress


Answers ( 1 )


    The iis7_delete_rewrite_rule() function in WordPress is specifically designed for websites hosted on servers using the IIS 7 (Internet Information Services 7) web server. This function plays a crucial role in managing URL rewriting, which is essential for permalinks in WordPress.

    Function Definition:

    iis7_delete_rewrite_rule( string $filename ): bool

    Function Description:

    • Purpose: The main purpose of this function is to delete a specific WordPress rewrite rule from the web.config file. The web.config file is a configuration file used by IIS web servers, similar to how .htaccess is used by Apache servers. It's important to manage these rewrite rules for proper functioning of permalinks and URL customization in WordPress sites hosted on IIS 7 servers.


    • $filename: This is a string parameter and is required. It specifies the name of the configuration file (usually web.config) from which the rewrite rule should be deleted.

    Return Value:

    • bool: The function returns a boolean value. It returns true if the deletion of the rewrite rule was successful, or false if it failed. This could be due to various reasons like the file not existing, the rule not being found in the file, or lack of proper permissions to modify the file.

    Sample Usage:

    Here's an example of how you might use iis7_delete_rewrite_rule() in a WordPress environment:

    $filename = 'web.config'; // The name of the IIS configuration file
    $result = iis7_delete_rewrite_rule($filename);
    if ($result) {
        echo 'Rewrite rule successfully deleted.';
    } else {
        echo 'Failed to delete rewrite rule.';

    In this example:

    1. We specify the name of the configuration file in $filename.
    2. We call iis7_delete_rewrite_rule() with $filename as an argument.
    3. The function attempts to delete the WordPress rewrite rule from the specified file.
    4. We then check the result. If it's true, it means the rule was successfully deleted. If it's false, it indicates a failure in deleting the rule.

    Important Notes:

    • Server Specific: This function is specific to WordPress sites hosted on IIS 7 servers. It won't be applicable or necessary for sites hosted on other types of servers like Apache.
    • File Permissions: Proper permissions are required to modify the web.config file. If the server’s file permissions are not set correctly, this function might fail.
    • Error Handling: Always check the returned value to ensure that the operation was successful.
    • Use in Context: This function is typically used in plugin or theme development or in specific deployment scripts, rather than in everyday WordPress site management.


    The iis7_delete_rewrite_rule() function is a key tool for developers and site administrators working with WordPress on IIS 7 servers, allowing them to effectively manage URL rewrite rules within the web.config file.

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