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    ZMQSocket::recv

    (PECL zmq >= 0.5.0)

    ZMQSocket::recv — Receives a message

    説明

    public ZMQSocket::recv(int $mode = 0): string

    Receive a message from a socket. By default receiving will block until a message is available unless ZMQ::MODE_DONTWAIT flag is used. ZMQ::SOCKOPT_RCVMORE socket option can be used for receiving multi-part messages. See ZMQSocket::setSockOpt() for more information.

    パラメータ

    mode

    Pass mode flags to receive multipart messages or non-blocking operation. See ZMQ::MODE_* constants.

    戻り値

    Returns the message. If ZMQ::MODE_DONTWAIT is used and the operation would block false shall be returned.

    エラー / 例外

    Throws ZMQSocketException on error.

    例

    例1 A send/recv example

    Non-blocking send / receive

    <?php

    /* Create new queue object, there needs to be a server at the other end */
    $queue = new ZMQSocket(new ZMQContext(), ZMQ::SOCKET_REQ);
    $queue->connect("tcp://127.0.0.1:5555");

    /* Assign socket 1 to the queue, send and receive */
    $retries = 5;
    $sending = true;

    /* Start a loop */
    do {
    try {
    /* Try to send / receive */
    if ($sending) {
    echo     "Sending message\n";
    $queue->send("This is a message", ZMQ::MODE_DONTWAIT);
    $sending = false;
    } else {
    echo     "Got response: " . $queue->recv(ZMQ::MODE_DONTWAIT) . "\n";
    break;
    }
    } catch (    ZMQSocketException $e) {
    /* EAGAIN means that the operation would have blocked, retry */
    if ($e->getCode() === ZMQ::ERR_EAGAIN) {
    echo     " - Got EAGAIN, retrying ($retries)\n";
    } else {
    die(    " - Error: " . $e->getMessage());
    }
    }
    /* Sleep a bit between operations */
    usleep(5);
    } while (--    $retries);
    ?>

    上の例の出力は、 たとえば以下のようになります。

    Sending message
 - Unable to execute operation, retrying (4)
Got response: This is a message

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