php获取文件的最后N行数据

<?phpheader("content-type:text/html;charset=utf-8");class GetFileLastNumRow{
    private $filePath;    private $fileMode = 'r';    private $rowNum = 3;    public function __construct(array $config)
    {
        foreach ($config as $key => $value) {            $this->$key = $value;
        }
    }    public function run()
    {
        try {            $handle = fopen($this->filePath, $this->fileMode);
            fseek($handle, -1, SEEK_END);            $contents = "";            $rowCount = 0;            do {                if (($str = fgetc($handle)) == "\n") {                    $rowCount++;
                }                $contents = $str.$contents;
                fseek($handle, -2, SEEK_CUR);
            } while ($rowCount < $this->rowNum);
            var_export(trim($contents, "\n"));
            fclose($handle);
        } catch(\Exception $e) {
            var_export($e->getMessage());
        }
    }
}class Test{
    public function run()
    {
        $filePath = './TestData/GetFileLastNumRow/test.data';        $getFileLastNumRow = new GetFileLastNumRow(compact('filePath'));        $getFileLastNumRow->run();
    }
}$test = new Test();$test->run();