wordpress write debug log

gistfile1.txt

<?php
/**
 * Plugin Name: Write log
 * Plugin URI: 
 * Description: Writes a message to /wp-content/debug.log if debugging is turned on.
 * Version: 1.0.0-dev
 * Author: wakasann
 * Author URI: http://wakasann.github.io/
 * Requires at least: 4.4
 * Tested up to: 4.5
 *
 */
if ( ! function_exists('write_log')) {
   /**
    * write log to debug.log file
    *
    * Writes a message to /wp-content/debug.log if debugging is turned on.
    * 
    * @link https://gist.github.com/theantichris/3219824
    * @link https://www.elegantthemes.com/blog/tips-tricks/using-the-wordpress-debug-log
    * @link http://www.stumiller.me/sending-output-to-the-wordpress-debug-log/
    * 
    * @param  mixed $message What to output to the log file
    * 
    * @return void
    */
   function write_log ( $log )  {
    if ( true === WP_DEBUG ) {
      if ( is_array( $log ) || is_object( $log ) ) {
         error_log( print_r( $log, true ) );
      } else {
         error_log( $log );
      }
    }
  }
}
/* Add the following lines to wp-config.php to turn on debugging. */
/*
define( 'WP_DEBUG', true );  // Turn debugging ON
define( 'SAVEQUERIES', true );
define( 'WP_DEBUG_DISPLAY', false ); // Turn forced display OFF
define( 'WP_DEBUG_LOG', true );  // Turn logging to wp-content/debug.log ON
*/