No cache version.
Caching disabled. Default setting for this page:enabled (code LNG204)If the display is too slow, you can disable the user mode to view the cached version.
Description
&$readable
, array &$writable
[, int $timeout = -1
] ) : int
Polls the items in the current poll set. The readable and writable items are returned in the
readable and writable parameters.
ZMQPoll::getLastErrors() can be used to check if there were errors.
Parameters
-
readable -
Array where readable ZMQSockets/PHP streams are returned. The array will be cleared at the beginning of the operation.
-
writable -
Array where writable ZMQSockets/PHP streams are returned. The array will be cleared at the beginning of the operation.
-
timeout -
Timeout for the operation. -1 means that poll waits until at least one item has activity. Please note that starting from version 1.0.0 the poll timeout is defined in milliseconds, rather than microseconds.
Examples
Example #1 A ZMQPoll() example
Create a simple poll server
<?php
/* Create socket, request-reply pattern (reply socket) */
$context = new ZMQContext();
$server = $context->getSocket(ZMQ::SOCKET_REP);
/* Bind to port 5555 on 127.0.0.1 */
$server->bind("tcp://127.0.0.1:5555");
/* Create new pollset for incoming/outgoing message */
$poll = new ZMQPoll();
/* Add the object and listen for poll in/out */
$id = $poll->add($server, ZMQ::POLL_IN | ZMQ::POLL_OUT);
echo "Added object with id " . $id . "\n";
/* Initialise readable and writable arrays */
$readable = array();
$writable = array();
while (true) {
/* Amount of events retrieved */
$events = 0;
try {
/* Poll until there is something to do */
$events = $poll->poll($readable, $writable, -1);
$errors = $poll->getLastErrors();
if (count($errors) > 0) {
foreach ($errors as $error) {
echo "Error polling object " . $error . "\n";
}
}
} catch (ZMQPollException $e) {
echo "poll failed: " . $e->getMessage() . "\n";
}
if ($events > 0) {
/* Loop through readable objects and recv messages */
foreach ($readable as $r) {
try {
echo "Received message: " . $r->recv() . "\n";
} catch (ZMQException $e) {
echo "recv failed: " . $e->getMessage() . "\n";
}
}
/* Loop through writable and send back messages */
foreach ($writable as $w) {
try {
$w->send("Got it!");
} catch (ZMQException $e) {
echo "send failed: " . $e->getMessage() . "\n";
}
}
}
}
?>
English translation
You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.
Thank you in advance.
Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-zmqpoll.poll.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.
