(PHP 5 >= 5.4.0, PHP 7)
streamWrapper::stream_truncate — Truncate stream
public streamWrapper::stream_truncate ( int $new_size ) : bool
Will respond to truncation, e.g., through ftruncate().
new_size
The new size.
Returns true on success or false on failure.
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https://www.php.net/manual/en/streamwrapper.stream-truncate.php