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                ## Http\\Response->sendfile 發送文件到瀏覽器。 ~~~ function Http\Response->sendfile(string $filename, int $offset = 0, int $length = 0); ~~~ * $filename要發送的文件名稱,文件不存在或沒有訪問權限sendfile會失敗 * 底層無法推斷要發送文件的MIME格式因此需要應用代碼指定`Content-Type` * 調用`sendfile`前不得使用`write`方法發送`Http-Chunk` * 調用`sendfile`后底層會自動執行`end` * `sendfile`不支持`gzip`壓縮 * `$offset`上傳文件的偏移量,可以指定從文件的中間部分開始傳輸數據。此特性可用于支持斷點續傳。 * `$length`發送數據的尺寸,默認為整個文件的尺寸 <br> ## 使用示例 ~~~ $response->header('Content-Type', 'image/jpeg'); $response->sendfile(__DIR__.$request->server['request_uri']); ~~~
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