add_new_template() add_new_template( $posts_templates) Adds our template to the page dropdown for v4.7+ Parameters $posts_templates
register_project_templates() register_project_templates( $atts) Adds our template to the pages cache in order to trick WordPress into thinking the template file exists where it doens't really exist. Parameters $atts
view_project_template() view_project_template( $template) Checks if the template is assigned to the page Parameters $template