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Directory >> /var/www/html/back/vendor/maennchen/zipstream-php/guides/

File / Folder	Size	Action
.	-
ContentLength.rst	1.339KB	edt ren
FlySystem.rst	1.055KB	edt ren
Nginx.rst	0.546KB	edt ren
Options.rst	2.347KB	edt ren
PSR7Streams.rst	0.525KB	edt ren
StreamOutput.rst	3.188KB	edt ren
Symfony.rst	4.554KB	edt ren
Varnish.rst	0.632KB	edt ren
index.rst	3.93KB	edt ren

Adding Content-Length header
=============

Adding a ``Content-Length`` header for ``ZipStream`` can be achieved by
using the options ``SIMULATION_STRICT`` or ``SIMULATION_LAX`` in the
``operationMode`` parameter.

In the ``SIMULATION_STRICT`` mode, ``ZipStream`` will not allow to calculate the
size based on reading the whole file. ``SIMULATION_LAX`` will read the whole
file if necessary.

``SIMULATION_STRICT`` is therefore useful to make sure that the size can be
calculated efficiently.

.. code-block:: php
    use ZipStream\OperationMode;
    use ZipStream\ZipStream;

$zip = new ZipStream(
        operationMode: OperationMode::SIMULATE_STRICT, // or SIMULATE_LAX
        defaultEnableZeroHeader: false,
        sendHttpHeaders: true,
        outputStream: $stream,
    );

// Normally add files
    $zip->addFile('sample.txt', 'Sample String Data');

// Use addFileFromCallback and exactSize if you want to defer opening of
    // the file resource
    $zip->addFileFromCallback(
        'sample.txt',
        exactSize: 18,
        callback: function () {
            return fopen('...');
        }
    );

// Read resulting file size
    $size = $zip->finish();
    
    // Tell it to the browser
    header('Content-Length: '. $size);
    
    // Execute the Simulation and stream the actual zip to the client
    $zip->executeSimulation();