session-plan-post-type-single-template.php

<?php
/* =============================================================================
   Apply single-session-plan.php to all session plan post types:

   Uses $session_plan_slugs global defined below
   ========================================================================== */
	add_filter( 'template_include', function( $template )
	{
		// session plan post types array:
		global $session_plan_slugs;

	    // get current post type:
	    $post_type = get_post_type();

	    if ( ! in_array( $post_type, $session_plan_slugs ) )
	    {
	        return $template;
	    }

	    return get_stylesheet_directory() . '/single-session-plan.php';
	}, 80);


// Session Plan CPT array.
// Each key represents the CPT slug, and must be 20 chars or less
// Each value represents the singular CPT label for WP Admin purposes
$session_plan_cpts = array(
  'session-plan'       => array(
      'label'           => 'Gym Session',
      'current-month'   => 'gyms',
      'landing-page'    => '/programs/gyms/',
      'plan-name'       => 'WUWO Gyms',
      'products'        => array(
          '_apex'    => 'WUWOgym_apex',
          '_small'   => 'WUWOgym_small',
          '_peak'    => 'WUWOgym_peak',
          '_river'   => 'WUWOgym_river',
          '_sunrise' => 'WUWOgym_sunrise',
          '_annual'  => 'WUWOgym_annual'
      ),
  ),
  'comp-session-plan'  => array(
      'label'           => 'Competitor Session',
      'current-month'   => 'competitors',
      'landing-page'    => '/programs/competitors/',
      'plan-name'       => 'WUWO Competitors',
      'products'        => array(
          '_apex'    => 'WUWOcomp_apex',
          '_small'   => 'WUWOcomp_small',
          '_peak'    => 'WUWOcomp_peak',
          '_river'   => 'WUWOcomp_river',
          '_sunrise' => 'WUWOcomp_sunrise',
          '_annual'  => 'WUWOcomp_annual'
      ),
  ),
  'kids-session-plan'  => array(
      'label'           => 'Kids Session',
      'current-month'   => 'kids',
      'landing-page'    => '/programs/kids/',
      'plan-name'       => 'WUWO Next Gen',
      'products'        => array(
          '_apex'    => 'WUWOkids_apex',
          '_small'   => 'WUWOkids_small',
          '_peak'    => 'WUWOkids_peak',
          '_river'   => 'WUWOkids_river',
          '_sunrise' => 'WUWOkids_sunrise',
          '_annual'  => 'WUWOkids_annual'
      ),
  ),
  'teens-session-plan' => array(
      'label'           => 'Teens Session',
      'current-month'   => 'teens',
      'landing-page'    => '/programs/kids/',
      'plan-name'       => 'WUWO Next Gen',
      'products'        => array(
          '_apex'    => 'WUWOkids_apex',
          '_small'   => 'WUWOkids_small',
          '_peak'    => 'WUWOkids_peak',
          '_river'   => 'WUWOkids_river',
          '_sunrise' => 'WUWOkids_sunrise',
          '_annual'  => 'WUWOkids_annual'
      ),
  ),
);

// a list of just the slugs (keys of above array):
$session_plan_slugs = array_keys( $session_plan_cpts );