# zookeeper_dispatch

(PECL zookeeper >= 0.4.0)

zookeeper_dispatch — Calls callbacks for pending operations

### 说明

zookeeper_dispatch ( void ) : void

The zookeeper_dispatch() function calls the callbacks passwd by operations like Zookeeper::get() or Zookeeper::exists().

Caution

Since version 0.4.0, this function must be called manually to achieve asynchronous operations. If you want that to be done automatically, you also can declare ticks at the beginning of your program.

After PHP 7.1, you can ignore this function. This extension uses EG(vm_interrupt) to implement async dispatch.

### 错误／异常

This method emits PHP warning when callback could not be invoked.

### 范例

Example #1 zookeeper_dispatch() example #1

Dispatch callbacks manually.

    <?php
    $client = new Zookeeper();
    $client->connect('localhost:2181');
    $client->get('/zookeeper', function() {
        echo "Callback was called".PHP_EOL;
    });
    while(true) {
        sleep(1);
        zookeeper_dispatch();
    }
    ?>

### 范例

Example #2 zookeeper_dispatch() example #2

Declare ticks.

    <?php
    declare(ticks=1);

    $client = new Zookeeper();
    $client->connect('localhost:2181');
    $client->get('/zookeeper', function() {
        echo "Callback was called".PHP_EOL;
    });
    while(true) {
        sleep(1);
    }
    ?>

### 参见

- Zookeeper::addAuth() - Specify application credentials
- Zookeeper::connect() - Create a handle to used communicate with zookeeper
- Zookeeper::__construct() - Create a handle to used communicate with zookeeper
- Zookeeper::exists() - Checks the existence of a node in zookeeper synchronously
- Zookeeper::get() - Gets the data associated with a node synchronously
- Zookeeper::getChildren() - Lists the children of a node synchronously
- Zookeeper::setWatcher() - Set a watcher function