Function and usage of register_default_headers() in wordpress

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    2024-01-08T12:26:01+00:00

    The register_default_headers() function in WordPress is used to register a selection of default header images that can be displayed by the custom header admin user interface. This function allows theme developers to offer a variety of predefined header images that users can select from within the WordPress admin area.

    Function Signature:

    register_default_headers( array $headers )
    

    Parameters:

    • $headers (array) - Required. This is an associative array of headers, where each header is keyed by a unique string ID. The value for each key is another associative array containing the following keys:
      • 'url': (string) The URL to the full-size image.
      • 'thumbnail_url': (string) The URL to the thumbnail-size image.
      • 'description': (string) A text description of the image.

    Sample Usage:

    Here's an example of how you might use register_default_headers() in a WordPress theme's functions.php file:

    function mytheme_default_headers() {
        register_default_headers( array(
            'beach' => array(
                'url'           => '%s/images/headers/beach.jpg',
                'thumbnail_url' => '%s/images/headers/beach-thumbnail.jpg',
                'description'   => __( 'Beach', 'mytheme' )
            ),
            'forest' => array(
                'url'           => '%s/images/headers/forest.jpg',
                'thumbnail_url' => '%s/images/headers/forest-thumbnail.jpg',
                'description'   => __( 'Forest', 'mytheme' )
            ),
            // ... additional headers ...
        ) );
    }
    add_action( 'after_setup_theme', 'mytheme_default_headers' );
    

    In this example, %s will be replaced with the template directory URI. This function is hooked to after_setup_theme to ensure it runs at the right point in the WordPress initialization process.

    Notes:

    • This function is usually used in conjunction with add_theme_support( 'custom-header' ) to enable custom headers in a WordPress theme.
    • The images for these headers should be included in the theme directory.
    • The descriptions and text domain used for translation should be consistent with the theme's overall text domain for localization purposes.

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