php-kafka

1、环境依赖

The extension support both PHP 5 and PHP 7.
The extension requires » librdkafka >= 0.8 for basic
functionality, and >= 0.9 for the high level consumer.

2、安装librdkafka

git clone https://github.com/edenhill/librdkafka.git
./configure
make
sudo make install

3、安装php-rdkafka

sudo pecl install rdkafka
#Add the following line to your php.ini file:
extension=rdkafka.so
重启服务器，查看phpinfo，即安装好了rdkafka拓展

4、使用

producer：

<?php
$rk = new RdKafka\Producer();
    $rk->setLogLevel(LOG_DEBUG);
$rk->addBrokers("127.0.0.1");
$topic = $rk->newTopic("test");
for ($i = 0; $i < 10; $i++) {
        $topic->produce(RD_KAFKA_PARTITION_UA, 0, "Message $i");
        $rk->poll(0);
}
while ($rk->getOutQLen() > 0) {
        $rk->poll(50);
}
?>

Low level consumer：

<?php
$conf = new RdKafka\Conf();
// Set the group id. This is required when storing offsets on the broker
$conf->set('group.id', 'myConsumerGroup');
$rk = new RdKafka\Consumer($conf);
$rk->addBrokers("127.0.0.1");
$topicConf = new RdKafka\TopicConf();
    $topicConf->set('auto.commit.interval.ms', 100);
// Set the offset store method to 'file'
$topicConf->set('offset.store.method', 'file');
    $topicConf->set('offset.store.path', sys_get_temp_dir());
// Alternatively, set the offset store method to 'broker'
// $topicConf->set('offset.store.method', 'broker');
// Set where to start consuming messages when there is no initial offset in
// offset store or the desired offset is out of range.
// 'smallest': start from the beginning
$topicConf->set('auto.offset.reset', 'smallest');
$topic = $rk->newTopic("test", $topicConf);
// Start consuming partition 0
$topic->consumeStart(0, RD_KAFKA_OFFSET_STORED);
while (true) {
    $message = $topic->consume(0, 120*10000);
    switch ($message->err) {
            case RD_KAFKA_RESP_ERR_NO_ERROR:
                var_dump($message);
                break;
            case RD_KAFKA_RESP_ERR__PARTITION_EOF:
                echo "No more messages; will wait for more\n";
                break;
            case RD_KAFKA_RESP_ERR__TIMED_OUT:
                echo "Timed out\n";
                break;
            default:
                throw new \Exception($message->errstr(), $message->err);
            break;
    }
}
?>

High-level consumer:

<?php
$conf = new RdKafka\Conf();
// Set a rebalance callback to log partition assignments (optional)
$conf->setRebalanceCb(function (RdKafka\KafkaConsumer $kafka, $err, array $partitions = null) {
    switch ($err) {
            case RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS:
                echo "Assign: ";
                var_dump($partitions);
                $kafka->assign($partitions);
            break;
         case RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS:
             echo "Revoke: ";
             var_dump($partitions);
                 $kafka->assign(NULL);
             break;
         default:
            throw new \Exception($err);
    }
});
// Configure the group.id. All consumer with the same group.id will consume
// different partitions.
$conf->set('group.id', 'myConsumerGroup');
// Initial list of Kafka brokers
$conf->set('metadata.broker.list', '127.0.0.1');
$topicConf = new RdKafka\TopicConf();
// Set where to start consuming messages when there is no initial offset in
// offset store or the desired offset is out of range.
// 'smallest': start from the beginning
$topicConf->set('auto.offset.reset', 'smallest');
// Set the configuration to use for subscribed/assigned topics
$conf->setDefaultTopicConf($topicConf);
$consumer = new RdKafka\KafkaConsumer($conf);
// Subscribe to topic 'test'
$consumer->subscribe(['test']);
echo "Waiting for partition assignment... (make take some time when\n";
echo "quickly re-joining the group after leaving it.)\n";
while (true) {
    $message = $consumer->consume(120*1000);
    switch ($message->err) {
            case RD_KAFKA_RESP_ERR_NO_ERROR:
                var_dump($message);
                break;
            case RD_KAFKA_RESP_ERR__PARTITION_EOF:
                echo "No more messages; will wait for more\n";
                break;
            case RD_KAFKA_RESP_ERR__TIMED_OUT:
                echo "Timed out\n";
                break;
            default:
                throw new \Exception($message->errstr(), $message->err);
            break;
    }
}
?>