Function and usage of resolve_block_template() in wordpress


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    The resolve_block_template() function in WordPress is used to determine the correct block template (wp_template) to render for a given template type in a theme. This function is especially useful in a block-based theme where templates and parts are primarily composed of blocks. Here's a detailed explanation of its functionality and usage:

    Function Definition:

    resolve_block_template( string $template_type, string[] $template_hierarchy, string $fallback_template ): WP_Block_Template|null


    1. $template_type (string, required): This parameter specifies the current template type that you're looking to render. For example, it could be 'single', 'page', 'archive', etc. This value helps in determining the specific type of template that should be used for rendering the current request.

    2. $template_hierarchy (string[], required): This is an array of template file names, ordered by priority. It represents the template hierarchy for the specified template type. WordPress will use this hierarchy to find the most appropriate template. For example, for a single post, this array might include 'single-{post-type}-{slug}.html', 'single-{post-type}.html', 'single.html', etc.

    3. $fallback_template (string, required): This parameter is a path to a PHP fallback template file. It is used if no matching block template is found in the template hierarchy. This ensures that your theme always has a template to fall back on, thereby maintaining backward compatibility with classic themes and ensuring content is always rendered.

    Return Value:

    • WP_Block_Template|null: The function returns a WP_Block_Template object if a suitable block template is found within the provided hierarchy. If no block template is found, it returns null.

    Sample Usage:

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

    $template_type = 'single';
    $template_hierarchy = ['single-post-my-custom-post.html', 'single-post.html', 'single.html'];
    $fallback_template = get_template_directory() . '/single.php';
    $block_template = resolve_block_template($template_type, $template_hierarchy, $fallback_template);
    if ($block_template) {
        // A block template was found and can be used for rendering.
    } else {
        // No block template found, use the fallback PHP template.

    In this example, we're trying to find the appropriate block template for rendering a single post. We define the template type as 'single', provide a hierarchy of possible template names, and specify a fallback PHP template. The resolve_block_template function will then attempt to find the most appropriate block template from the provided hierarchy or return null if none is found.

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