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php_stream_write() or fwrite() sends n bytes to be
written to the stream.
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A bucket is created from the buffer.
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The bucket is pushed to the topmost filter on the write stack.
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We wind the handle on the filter; it may tranforms buckets,
and pushes them onto the next filter.
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repeat the last step until we hit the the underlying stream.
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Each bucket is written to the underlying stream.
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Process repeats until one of the steps filters in the stack
produces no output buckets.
