Write out a multiline log to the wordpress debug.log file

write_log.php

<?php 

/**
 * Write out a multiline log to the wordpress debug.log file
 */
if (!function_exists('write_log')) {
    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);
            }
        }
    }
}