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php_stream_read() or fread() requests n bytes to be placed
into a buffer.
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The topmost filter on the read stack returns the data from its own buffered brigade,
if any, splitting buckets if required.
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If it doesn't have enough data, it asks the next filter in the stack
for some more data.
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This process repeats until the actual underlying stream is hit.
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The stream reads a chunk of data and returns it to the filter.
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The data moves along the brigades, perhaps being transformed
along the way.
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Topmost filter gets the data and stores it in the buffer.
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Process repeats until the buffer is filled or there is
no more data available from the stream.
