Function and usage of get_custom_header() in wordpress

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    2024-01-06T20:21:57+00:00

    The get_custom_header() function in WordPress is used to retrieve header image data. Here's a detailed explanation and sample usage:

    Function: get_custom_header()

    • Type: object
    • Purpose: This function is used to get the header image data in WordPress.
    • Return Value: The function returns an object.

    Usage

    The get_custom_header() function is typically used in WordPress themes to access information about the custom header image that has been set in the theme customizer.

    Sample Code

    <?php
    // Get the header image data
    $header = get_custom_header();
    
    // Check if there is a header image set
    if ( ! empty( $header->url ) ) {
        echo '<img src="' . esc_url( $header->url ) . '" height="' . esc_attr( $header->height ) . '" width="' . esc_attr( $header->width ) . '" alt="Header Image">';
    }
    ?>
    

    In this example:

    1. We call get_custom_header() to retrieve the header image data.
    2. We check if the url property of the header object is not empty, which indicates that a header image is set.
    3. If a header image exists, we output an img HTML tag with the source (src) set to the URL of the header image. We also use esc_url() to sanitize the URL, and esc_attr() to sanitize the height and width attributes for security.
    4. The alt attribute is set for accessibility purposes.

    Notes:

    • The function is part of the WordPress Theme Customization API.
    • The object returned by get_custom_header() contains properties like url, height, width, and others, depending on the header image's settings.
    • It's important to escape and validate data properly when outputting it to the browser for security and best practices.

    This function is useful for theme developers who want to offer customizable header images in their themes and need to retrieve the selected image details for rendering in the theme's layout.

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