PHP log debugging

/** *  For log debugging only  * * @param string|array $content  Log contents  * @param bool $json  Whether to adopt JSON Format store  * @param bool $append  Whether to use the append mode to record the log  * @param string $filename  file name ( Considering the issue of authority , All pressed in /tmp Catalog ) * * @return int */
if (!function_exists("debug")) {
    
    function debug($content, $json = true, $append = true, $filename = "debug", $base_dir = "/tmp/")
    {
    
        if (empty($filename) || empty($content)) return 0;

        $filename = str_replace("/", "", $filename);
        $filename = str_replace("\\", "", $filename);

        // if ("linux" == strtolower(PHP_OS)) {
    
        // $dir = !empty($base_dir) ? $base_dir : (env("CACHE_DIR") ? env("CACHE_DIR") . "/logs/" : "/tmp/");
        // } else {
    
        // $dir = env("CACHE_DIR") ? CACHE_DIR : 'C:\\';
        // }
        $dir = storage_path('logs/' . date('Ymd'));

        $rs = true;
        //if (!is_dir($dir)) {
    
        $rs = @mkdir($dir, 0755, true);
        //}

        if (empty($rs)) $dir = "/tmp/";
        $filename = $dir . DIRECTORY_SEPARATOR . $filename . ".log";

        if (!empty($json)) {
    
            $content = json_encode($content, JSON_UNESCAPED_UNICODE);
        } else {
    
            $content = var_export($content, true);
        }

        $client_ip = getClientIp();
        $log_time = date('Y-m-d H:i:s', time());
        $content = "【" . $log_time . " | {
      $client_ip}】" . $content . "\r\n";

        if (empty($append)) {
    
            $rs = file_put_contents($filename, $content);
        } else {
    
            $rs = file_put_contents($filename, $content, FILE_APPEND);
        }

        return $rs;
    }
}