# ZMQContext::getSocket

(PECL zmq >= 0.5.0)

ZMQContext::getSocket — Create a new socket

### 说明

public ZMQContext::getSocket(int `$type`, string `$persistent_id` = `null`, callable `$on_new_socket` = `null`): ZMQSocket

Shortcut for creating new sockets from the context. If the context is not persistent the `persistent_id` parameter is ignored and the socket falls back to being non-persistent. The `on_new_socket` is called only when a new underlying socket structure is created.

### 参数

`type`

  `ZMQ::SOCKET_*` constant to specify socket type.

`persistent_id`

  If `persistent_id` is specified the socket will be persisted over multiple requests.

`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. The callback takes ZMQSocket and persistent_id as two arguments.

### 返回值

Returns a ZMQSocket object.

### 错误／异常

Throws ZMQSocketException on error.

### 示例

示例 #1 A ZMQContext() example

Basic usage

`<?php
/* Allocate a new context */
$context = new ZMQContext();
/* Create a new socket */
$socket = $context->getSocket(ZMQ::SOCKET_REQ, 'my sock');
/* Connect the socket */
$socket->connect("tcp://example.com:1234");
/* Send a request */
$socket->send("Hello there");
/* Receive back the response */
$message = $socket->recv();
echo "Received message: {$message}\n";
?>`
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