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Editing: init.php

<?php
namespace radiustheme\Koncrete_Core;

class Koncrete_Templates_Init {

/**
   * A reference to an instance of this class.
   */
  private static $instance;

/**
   * The array of templates that this plugin tracks.
   */
  protected $templates;

/**
   * Returns an instance of this class.
   */
  public static function instance() {

if ( null == self::$instance ) {
      self::$instance = new self;
    }

return self::$instance;

}
  private function __construct() {
    $this->templates = array(
      'blog-archive-1.php' => 'Blog Archive 1',
      'blog-archive-2.php' => 'Blog Archive 2',

'project-archive-1.php' => 'Project Archive 1',
      'project-archive-2.php' => 'Project Archive 2',
      'project-archive-3.php' => 'Project Archive 3',

'service-archive-1.php' => 'Service Archive 1',
      'service-archive-2.php' => 'Service Archive 2',
      'service-archive-3.php' => 'Service Archive 3',

'team-archive-1.php' => 'Team Archive 1',
      'team-archive-2.php' => 'Team Archive 2',
      'team-archive-3.php' => 'Team Archive 3',

);
    add_action( 'plugins_loaded', array( $this, 'page_templates_init' ) );
  }

/**
   * Initializes the plugin by setting filters and administration functions.
   */
  public function page_templates_init() {

// Add a filter to the attributes metabox to inject template into the cache.
    if ( version_compare( floatval( get_bloginfo( 'version' ) ), '4.7', '<' ) ) {

// 4.6 and older
      add_filter(
        'page_attributes_dropdown_pages_args',
        array( $this, 'register_project_templates' )
      );

} else {

// Add a filter to the wp 4.7 version attributes metabox
      add_filter(
        'theme_page_templates', array( $this, 'add_new_template' )
      );

}

// Add a filter to the save post to inject out template into the page cache
    add_filter(
      'wp_insert_post_data',
      array( $this, 'register_project_templates' )
    );

// Add a filter to the template include to determine if the page has our
    // template assigned and return it's path
    add_filter(
      'template_include',
      array( $this, 'view_project_template')
    );

}

/**
   * Adds our template to the page dropdown for v4.7+
   *
   */
  public function add_new_template( $posts_templates ) {
    $posts_templates = array_merge( $posts_templates, $this->templates );
    return $posts_templates;
  }

/**
   * Adds our template to the pages cache in order to trick WordPress
   * into thinking the template file exists where it doens't really exist.
   */
  public function register_project_templates( $atts ) {

// Create the key used for the themes cache
    $cache_key = 'page_templates-' . md5( get_theme_root() . '/' . get_stylesheet() );

// Retrieve the cache list.
    // If it doesn't exist, or it's empty prepare an array
    $templates = wp_get_theme()->get_page_templates();
    if ( empty( $templates ) ) {
      $templates = array();
    }

// New cache, therefore remove the old one
    wp_cache_delete( $cache_key , 'themes');

// Now add our template to the list of templates by merging our templates
    // with the existing templates array from the cache.
    $templates = array_merge( $templates, $this->templates );

// Add the modified cache to allow WordPress to pick it up for listing
    // available templates
    wp_cache_add( $cache_key, $templates, 'themes', 1800 );

return $atts;

}

/**
   * Checks if the template is assigned to the page
   */
  public function view_project_template( $template ) {

// Get global post
    global $post;

// Return template if post is empty
    if ( ! $post ) {
      return $template;
    }

// Return default template if we don't have a custom one defined
    if ( ! isset( $this->templates[get_post_meta(
      $post->ID, '_wp_page_template', true
    )] ) ) {
      return $template;
    }

$file = Constants::$plugin_templates_dir . get_post_meta(
      $post->ID, '_wp_page_template', true
    );

// Just to be safe, we check if the file exist first
    if ( file_exists( $file ) ) {
      return $file;
    } else {
      echo esc_html( $file );
    }

// Return template
    return $template;

}

}
Koncrete_Templates_Init::instance();