Logging function for internal WordPress errors. Useful for debugging things that don't print errors to screen, like 'save-post'. Source: https://stackoverflow.com/a/10438630/4941993

log_it.php

if(!function_exists('log_it')){
  function log_it( $message ) {
    if( WP_DEBUG === true ){
      if( is_array( $message ) || is_object( $message ) ){
        error_log( print_r( $message, true ) );
      } else {
        error_log( $message );
      }
    }
  }
}