drupal8_force_log.php

<?php 
/**
  * @return void
  * @param $var The variable passed
  * @param string $module The name of module
  * @param integer limit The limit for each
  */
  public function log($var,$module,$limit =2)
  {
      
          $d= debug_backtrace();          
          ob_start();
          
          $message="debug_backtrace:";

          foreach ($d as $level => $infoline) {
            $file = $infoline['file'];
            $line = $infoline['line'];
            $infoline = "level ".$level.": ".$file. "- ".$line.";";
            $message.= $infoline;
            if($level>$limit){
              break;
            }
          }

          echo $message;
          var_dump($var);
          $debug_backtrace = ob_get_clean();
      
          \Drupal::logger($module)->debug('@'.$module.'Log: '.$debug_backtrace);
}