ZMQSocket::__construct

(PECL zmq >= 0.5.0)

ZMQSocket::__construct — Construct a new ZMQSocket

Description

ZMQSocket::__construct ( ZMQContext $context , int $type [, string $persistent_id = NULL [, callback $on_new_socket = NULL ]] )

Constructs a ZMQSocket object. persistent_id parameter can be used to allocated a persistent socket. A persistent socket has to be allocated from a persistent context and it stays connected over multiple requests. The persistent_id parameter can be used to recall the same socket over multiple requests. The on_new_socket is called only when a new underlying socket structure is created.

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Parameters

context: ZMQContext object.
type: The socket type. See ZMQ::SOCKET_* constants.
persistent_id: If persistent_id is specified the socket will be persisted over multiple requests. If context is not persistent the socket falls back to non-persistent mode.
on_new_socket: Callback function, which is executed when a new socket structure is created. This function does not get invoked if the underlying persistent connection is re-used.

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Examples

Example #1 A ZMQSocket() example

Using callback the bind/connect socket


<?php

/*
  The socket is persistent so this function is called only on the 
  first request to the script.
*/
function on_new_socket_cb(ZMQSocket $socket, $persistent_id = null)
{
    if ($persistent_id === 'server') {
        $socket->bind("tcp://localhost:12122");
    } else {
        $socket->connect("tcp://localhost:12122");
    }
}

/* Allocate a new context */
$context = new ZMQContext();

/* Create a new socket */
$socket = $context->getSocket(ZMQ::SOCKET_REP, 'server', 'on_new_socket_cb');

$message = $socket->recv();
echo "Received message: {$message}\n";
?>

The callback signature

Note:
function on_new_socket_cb(ZMQSocket $socket, string $persistent_id = null);

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Return Values

Throws ZMQSocketException on error.

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Document created the 30/01/2003, last modified the 26/10/2018
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References

Manuel PHP : http://php.net

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