Laravel stream large file from disk with buffer.

Laravel stream large file with buffer .php

<?php

// inspired by https://github.com/imanghafoori1/laravel-video
// if you need this for video, this does not support seek.
// laravel-video supports seek and chunks, so use that for video.

Route::get('/big-file-stream', function () {
    $filePath = \Storage::disk('local')->path('video.mp4');
    $fileStream = \Storage::disk('local')->readStream('video.mp4');

    $fileSize = filesize($filePath);
    $headers = [
        'Content-type' => 'video/mp4',
        // 'Content-type' => 'application/pdf',
        // 'Content-Disposition' => 'attachment; filename=video.mp4', // if you need to force download
        'Pragma' => 'no-cache',
        'Cache-Control' => 'must-revalidate, post-check=0, pre-check=0',
        'Expires' => '0',
        'Content-Length' => $fileSize,
    ];
    set_time_limit(0);
    $end = $fileSize - 1;
    $callback = function () use ($fileStream, $end) {
        ob_get_clean();
        $i = 0;
        $buffer = 102400;
        while (!feof($fileStream) && $i <= $end) {
            $bytesToRead = $buffer;
            if ($i + $bytesToRead > $end) {
                $bytesToRead = $end - $i + 1;
            }
            $data = fread($fileStream, $bytesToRead);
            echo $data;
            flush();
            $i += $bytesToRead;
        }
        fclose($fileStream);
    };
    return \Illuminate\Support\Facades\Response::stream($callback, 200, $headers)->send();
});