TwigPress

This plugin provides a simple way for you to use the Twig templating engine with WordPress themes. A problem with WordPress themes is that it is very easy to create templates that are a mess of PHP and HTML. This isn’t good for working with neither does it provide a separation of concerns. The Twig templating engine is a great engine that allows you to separate out getting & manipulating your data and rendering it out. You create your themes in the same way as before, only you render a template instead of using PHP within your page structure.

The Installation section provides the steps to using this plugin with your theme.

In the Other Notes section, there is an easy reference for the different functions/filters and what they can be used for.

For Twig, the Twig documentation is the best resource I can offer. It is extremely well documented.

Functions and Filters

Functions

twigpress_render_twig_template($vals = array(), $template = false, $echo = true)

Calling this function renders a $template with the values passed in $vals. You can also choose a specific template to render and whether you would like to echo the template or simply return it.

There is no need to explicitly set the $template name. If this is left to the default, the plugin will look for a template with the same name as the PHP file being rendered (with a ‘.twig’ extension). For example, if front-page.php is being rendered the plugin will attempt to find front-page.twig.

If you wish to simply return the rendered template, set $echo to false.

twigpress_get_the_content()

Use this function to get the content for the post you are dealing with. If you use get_the_content, WordPress returns the unformatted content and the the_content filter is not applied. twigpress_get_the_content() takes care of both of these tasks.

Filters

twigpress_twig_site_variables

This filter is applied when the plugin is instantiated, on the ‘init’ action, and allows you to alter the array of variables that are passed to the Twig environment when it is first created. As such, these variables are available to all templates. This filter is best suited for site-wide information. For post-specific variables, use the twigpress_twig_post_template_vars filter.

Defaults:

'site' => array(
    'lang_attributes' => get_bloginfo('language'),
    'charset' => get_bloginfo('charset'),
    'url' => get_bloginfo('url'),
    'stylesheet_directory' => get_stylesheet_directory_uri(),
    'title' => get_bloginfo('name'),
    'description' => get_bloginfo('description')
)

In templates these would be accessible through, for example, {{ site.stylesheet_directory }}.

twigpress_twig_global_functions

There will be times when you need to use PHP functions in your templates, and there is no way to capture their content to pass to the template when it is rendered. This filter gives you access to the array of functions that are added to the Twig environment, making them available for calling in your templates.

Defaults: wp_head(), wp_footer(), wp_title(), body_class(), wp_nav_menu()

twigpress_twig_post_template_vars

This filter is applied to your passed array of $vars immediately before the template is rendered. This filter is ideal for when you have a set of default variables you wish to include in every template, but are related to posts not the entire site.