(PECL zmq >= 0.5.0)
Receives a message
public string ZMQSocket::recv ([ integer $mode = 0 ] )
Receive a message from a socket. By default receiving will block until a message is available unless ZMQ::MODE_NOBLOCK
flag is used. ZMQ::SOCKOPT_RCVMORE
socket option can be used for receiving multi-part messages. See ZMQSocket::setSockOpt() for more information.
Parameters:
mode
Pass mode flags to receive multipart messages or non-blocking operation. See ZMQ::MODE_*
constants.
Returns:
Returns the message. Throws ZMQSocketException in error. If ZMQ::MODE_NOBLOCK
is used and the operation would block boolean false shall be returned.
Examples:
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_NOBLOCK); $sending = false; } else { echo "Got response: " . $queue->recv(ZMQ::MODE_NOBLOCK) . "\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); ?>
The above example will output something similar to:
Sending message - Unable to execute operation, retrying (4) Got response: This is a message
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