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Showing content from https://arnaud-lb.github.io/php-rdkafka-doc/phpdoc/rdkafka.poll.html below:

Poll for events

(PECL rdkafka >= 0.9.1)

RdKafka::poll — Poll for events

public RdKafka::poll ( integer $timeout_ms ) : void

Note:

An application using a sub-class of RdKafka should make sure to call poll() at regular intervals to serve any queued callbacks waiting to be called.

Events:

• Delivery report callbacks RdKafka\Conf::setDrMsgCb() [producer]
• Error callbacks (RdKafka\Conf::setErrorCb())
• Stats callbacks (RdKafka\Conf::setStatsCb())
• Throttle callbacks (RdKafka\Conf::setThrottleCb())

timeout_ms (integer)

Specifies the maximum amount of time (in milliseconds) that the call will block waiting for events. For non-blocking calls, provide 0 as timeout_ms. To wait indefinately for an event, provide -1.

Returns the number of events served.

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