public function addWriteData($buf)
    {
        if ($this->outBuf === null) {
            $this->outBuf = $buf;
        } else {
            $this->outBuf .= $buf;
        }
    }
public function addWriteData($buf)
    {
        if ($this->outBuf === null) {
            $this->outBuf = $buf;
        } else {
            $this->outBuf .= $buf;
        }
    }
public function addWriteData ( $ buf ) { if ( $ this -> outBuf === null ) { $ this -> outBuf = $ buf ; } else { $ this -> outBuf .= $ buf ; } }
Append writing cache
@param $buf string data content.
Append writing cache