Elgg\Logger::process PHP Method

    protected function process($data, $display, $level)
    {
        // plugin can return false to stop the default logging method
        $params = array('level' => $level, 'msg' => $data, 'display' => $display, 'to_screen' => $display);
        if (!$this->hooks->trigger('debug', 'log', $params, true)) {
            return;
        }
        // Do not want to write to JS or CSS pages
        if ($this->context->contains('js') || $this->context->contains('css')) {
            $display = false;
        }
        // don't display in simplecache requests
        $path = substr(current_page_url(), strlen(elgg_get_site_url()));
        if (preg_match('~^(cache|action|serve-file)/~', $path)) {
            $display = false;
        }
        if ($display == true) {
            echo '<pre class="elgg-logger-data">';
            echo htmlspecialchars(print_r($data, true), ENT_QUOTES, 'UTF-8');
            echo '</pre>';
        }
        error_log(print_r($data, true));
    }