WPLib::doing_ajax PHP Method

    static function doing_ajax()
    {
        return defined('DOING_AJAX') && DOING_AJAX;
    }

 /**
  * @param string $template
  * @param array|string $_template_vars
  * @param WPLib_Item_Base|object $item
  *
  * @note This is called via an instance as well as
  *       If this becomes deprecated we can prefix with an '_' and then
  *       use __call() and __callStatic() to allow it to be invoked.
  * @see  http://stackoverflow.com/a/7983863/102699
  */
 static function the_template($template, $_template_vars = array(), $item = null)
 {
     $_filename = preg_replace('#(\\.php)$#', '', ltrim($template, '/')) . '.php';
     $template = new stdClass();
     $template->dir = get_stylesheet_directory();
     /*
      * If root path (i.e. "~/wp-content/...") add ABSPATH to the template file after removing ~
      * If not root path, assume the template file is in /templates/ inside the theme directory
      */
     $_templates_subdir = static::templates_subdir();
     $template->filename = preg_match('#^~[\\/](.+)#', $_filename, $match) ? ABSPATH . $match[1] : "{$template->dir}/{$_templates_subdir}/{$_filename}";
     if (!is_string($_template_vars) || false !== strpos($_template_vars, '=')) {
         $_specialty = false;
         if (is_string($_template_vars)) {
             $_template_vars = wp_parse_args($_template_vars);
         }
         if (false === $_template_vars || is_null($_template_vars)) {
             $_template_vars = array();
         } else {
             if (!is_array($_template_vars)) {
                 $message = __('Unexpected value for 2nd parameter passed to the_template(). Expected array, string, false or null but got %s.', 'wplib');
                 WPLib::trigger_error(sprintf($message, gettype($_template_vars)));
             }
         }
     } else {
         /**
          * If a string is passed assume it is for a more specific template and behave like get_template_part().
          */
         $_specialty = esc_attr($_template_vars);
         $_template_vars = array();
         $_specialty = preg_replace('#(\\.php)$#', "-{$_specialty}\$1", $template->filename);
     }
     if ($_specialty && is_file($_specialty)) {
         /**
          * We found the special template before the general one.
          */
         $template->filename = $_specialty;
         $_specialty = true;
     }
     if (true !== $_specialty && !is_file($template->filename)) {
         /**
          * No speciality template and no template at all.
          */
         $template->filename = $template->dir = false;
         if (!WPLib::is_production()) {
             /**
              * This is ONLY output if constant 'WPLIB_RUNMODE' is defined in wp-config.php.
              */
             echo "\n<!--[FAILED Template File: {$template->filename} -->\n";
         }
     }
     if (!$template->filename) {
         $output = false;
     } else {
         if (!WPLib::doing_ajax() && !WPLib::is_production()) {
             echo "\n<!--[Template File: {$template->filename} -->\n";
         }
         extract($_template_vars, EXTR_PREFIX_SAME, '_');
         if ($item && ($_var_name = WPLib::get_constant('VAR_NAME', get_class($item)))) {
             /*
              * Assign the $item's preferred variable name in addition to '$item', i.e. '$brand'
              * This is a very controlled use of extract() i.e. I know what I am doing here.
              */
             extract(array($_var_name => $item));
         }
         $template->vars = $_template_vars;
         unset($_template_vars, $_templates_subdir, $_filename, $_cache_key, $_var_name, $_specialty);
         ob_start();
         self::$_file_loading = $template->filename;
         require $template->filename;
         self::$_file_loading = false;
         $output = ob_get_clean();
     }
     echo $output;
 }