Function and usage of remove_query_arg() in wordpress

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    2024-01-08T00:13:29+00:00

    The remove_query_arg() function in WordPress is used to remove one or more query arguments from a URL. This function is particularly useful when you need to modify URLs by removing certain query parameters while keeping the rest of the URL intact. It's often used in WordPress development for tasks like pagination, filtering posts, or redirecting users.

    Function Signature

    remove_query_arg( string|string[] $key, false|string $query = false ): string
    

    Function Details

    1. Purpose:

      • The function is designed to remove an item or items from a query string.
    2. Description:

      • Important Note: The return value of remove_query_arg() is not automatically escaped. This means that you should escape the output using esc_url() or a similar function to prevent vulnerabilities to cross-site scripting (XSS) attacks. This is a critical step in ensuring the security of your WordPress application.
    3. Parameters:

      • $key (string|string[]): This parameter is required. It specifies the query key or keys that you want to remove from the URL. You can pass a single string if you're removing just one query argument, or an array of strings if you're removing multiple arguments.
      • $query (false|string): This is an optional parameter. It specifies the URL query string from which you want to remove the key(s). If set to false (which is the default value), the function uses the current URL.
    4. Return:

      • string: The function returns a new URL query string after the specified key(s) have been removed.

    Sample Usage

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

    // Assume the current URL is http://example.com?page=5&order=asc
    
    // To remove a single query arg
    $new_url = remove_query_arg( 'order' );
    // Result: http://example.com?page=5
    
    // To remove multiple query args
    $new_url = remove_query_arg( array( 'page', 'order' ) );
    // Result: http://example.com
    
    // To remove a query arg from a specific URL
    $url = 'http://example.com?page=5&order=asc&filter=active';
    $new_url = remove_query_arg( 'filter', $url );
    // Result: http://example.com?page=5&order=asc
    

    In these examples, remove_query_arg() is used to remove one or more query parameters from URLs. Remember to escape the output using esc_url() when outputting it to the browser to prevent XSS attacks.

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