Provides a buffer stream that can be written to to fill a buffer, and read
from to remove bytes from the buffer.

This stream returns a "hwm" metadata value that tells upstream consumers
what the configured high water mark of the stream is, or the maximum
preferred size of the buffer.

public __construct( $hwm = 16384)
    public __toString()
    public close()
    public detach()
    public eof()
    public getContents()
    public getMetadata( $key = NULL)
    public getSize()
    public isReadable()
    public isSeekable()
    public isWritable()
    public read( $length)

    Reads data from the buffer.

    public rewind()
    public seek( $offset, $whence = 0)
    public tell()
    public write( $string)

    Writes data to the buffer.

    private $buffer
    private $hwm
    © 2020 Bruce Wells
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