Function and usage of has_custom_logo() in wordpress

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    2024-01-08T16:03:59+00:00

    The has_custom_logo() function in WordPress is used to determine whether a specific site or blog within a WordPress multisite network has a custom logo set. This function is particularly useful when you're working with themes and want to add conditional checks for the presence of a custom logo.

    Function Syntax:

    has_custom_logo( int $blog_id ): bool
    

    Parameters:

    • $blog_id (int, optional): This parameter specifies the ID of the blog for which you want to check the presence of a custom logo. By default, if no $blog_id is provided, the function checks for the custom logo of the current blog in a multisite network.

    Return Value:

    • bool: The function returns a boolean value (true or false). It returns true if the site has a custom logo set; otherwise, it returns false.

    Sample Usage:

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

    <?php
    // Check if the current blog has a custom logo
    if ( has_custom_logo() ) {
        // Output the custom logo HTML
        the_custom_logo();
    } else {
        // Fallback to displaying the site title if no custom logo is set
        echo '<h1>' . get_bloginfo( 'name' ) . '</h1>';
    }
    ?>
    

    In this example, the code checks if the current blog has a custom logo using has_custom_logo(). If a custom logo exists, it uses the_custom_logo() to output the logo's HTML. If no custom logo is set, it falls back to displaying the site's name using get_bloginfo('name').

    Usage in Multisite Network:

    If you're working with a multisite network and want to check if a specific blog has a custom logo, you can pass the blog ID as an argument:

    <?php
    $blog_id = 2; // Example blog ID
    
    // Check if the specified blog has a custom logo
    if ( has_custom_logo( $blog_id ) ) {
        // Actions to take if the specified blog has a custom logo
        // ...
    }
    ?>
    

    In this case, $blog_id is the ID of the blog you're checking. This flexibility is useful for theme developers or when creating custom functionalities in a WordPress multisite environment.

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