Fast debugging method with Wordpress.

wp_debugging.php

/* 
* Put this function in your plugin or functions.php and pass the parameter $log to be debugged.
* Example: wpui_write_log( $log ) where $log is the data to be debugged.
* It writes into  /debug.log of your wp-content/
* Could be used as class method as well
*/

function wpui_write_log( $log )  {
      if ( is_array( $log ) || is_object( $log ) ) {
         error_log( print_r( $log, true ) );
      } else {
         error_log( $log );
      }
   }