Swift_ByteStream_ArrayByteStream::read PHP Method

    public function read($length)
    {
        if ($this->_offset == $this->_arraySize) {
            return false;
        }
        // Don't use array slice
        $end = $length + $this->_offset;
        $end = $this->_arraySize < $end ? $this->_arraySize : $end;
        $ret = '';
        for (; $this->_offset < $end; ++$this->_offset) {
            $ret .= $this->_array[$this->_offset];
        }
        return $ret;
    }