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Yar_Concurrent_Client::call() is a function in PHP's Yar extension that allows making concurrent remote procedure calls (RPCs) to multiple servers. It is useful when you need to call multiple remote methods simultaneously and wait for all responses.

Here's a detailed explanation of how to use Yar_Concurrent_Client::call():

1. First, make sure you have the Yar extension installed and enabled in your PHP environment.

2. Initialize the Yar_Concurrent_Client class:

php
$client = new Yar_Concurrent_Client();


3. Next, you can register multiple remote procedure calls using the Yar_Concurrent_Client::call() method. Each call requires three parameters: the remote server URL, the method name, and an array of parameters to pass to the remote method. Here's an example:

php
$client->call('http://example.com/server1.php', 'remoteMethod1', array('param1'));
$client->call('http://example.com/server2.php', 'remoteMethod2', array('param2'));


You can register as many calls as needed.

4. After registering all the calls, you need to send them using the Yar_Concurrent_Client::loop() method:

php
$client->loop();


This will execute all the registered calls concurrently and wait for the responses.

5. Finally, you can retrieve the responses using the Yar_Concurrent_Client::get() method. It returns an array with the responses in the same order as the registered calls:

php
$responses = $client->get();

// Work with the responses
foreach ($responses as $response) {
// Handle each response
// $response contains the result of each remote call
}


Make sure to handle any errors or exceptions that may occur during the process.

That's a basic overview of how to use Yar_Concurrent_Client::call() in PHP. You can adapt it to your specific use case and requirements.