error-logging-instructions.md

1) Configure the wp-config.php

As follows:

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);

2) Add must use plugin file

Place error-logging.php in wp-content/mu-plugins folder.

3) Write stuff to the log

Like so:

write_log( "string" );
write_log( $variable_or_array );

error-logging.php

<?php

ini_set('error_log', WP_CONTENT_DIR . '/debug.log');
ini_set('log_errors', 'On');
ini_set('display_errors', 'Off');

error_reporting(E_ERROR | E_PARSE); // Only write errors, not notices, or warnings
//error_reporting(E_ERROR | E_WARNING | E_PARSE); // if you want to also display warnings

if ( ! function_exists('write_log')) {
   function write_log ( $log )  {
      if ( is_array( $log ) || is_object( $log ) ) {
         error_log( print_r( $log, true ) );
      } else {
         error_log( $log );
      }
   }
}