Athenaeum
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Truncate

To truncate the stream to a specific size, use truncate().

$stream = FileStream::open('persons.txt', 'r')
    ->truncate(0);

echo $stream->getSize(); // 0

$stream = FileStream::open('persons.txt', 'r')
    ->truncate(25);

echo $stream->getSize(); // 25

Behind the scene, PHP's ftruncate()open in new window is used to truncate stream.