JAXLPipe::set_callback PHP Method

    public function set_callback($recv_cb)
    {
        $this->recv_cb = $recv_cb;
    }

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 *
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 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRIC
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 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */
// include and configure logger
require_once 'jaxl.php';
JAXLLogger::$level = JAXL_INFO;
// include jaxl pipes
require_once JAXL_CWD . '/core/jaxl_pipe.php';
// initialize
$pipe_name = getmypid();
$pipe = new JAXLPipe($pipe_name);
// add read event callback
$pipe->set_callback(function ($data) {
    global $pipe;
    _info("read " . trim($data) . " from pipe");
});
JAXLLoop::run();
echo "done\n";