Using PHP, is it possible to perform a function asynchronously?
Example:
The client makes a request to the server, in this request PHP executes an asynchronous function that can take a few seconds, but before it finishes, the server responds to the client so that while the asynchronous operation is being executed , the browser does not have to wait until it stops responding.
Yes, from some external libraries you can implement similar things quite simply.
The most well-known project is reactPHP .
There is a very interesting benchmark comparing the reactPHP with nodeJS .
You can achieve this result by using parallelism with the PHP Gearman
Example:
<?php
# Criação do worker
$gmworker= new GearmanWorker();
# Adicionando um servidor (localhost é o padrão)
$gmworker->addServer();
# Registre uma função
$gmworker->addFunction("reverse", "reverse_fn");
print "Esperando resultado...\n";
while($gmworker->work())
{
if ($gmworker->returnCode() != GEARMAN_SUCCESS)
{
echo "return_code: " . $gmworker->returnCode() . "\n";
break;
} else {
print "Ainda esperando resultado...\n";
}
}
function reverse_fn($job)
{
return strrev($job->workload());
}
See more examples in the PHP manual.
In complento the two answers above,
you can use German + reactPhp
with the gearman-async : "The Async Gearman implementation for PHP ontop of reactphp"
Example usage:
<?php
use Gearman\Async\ClientInterface;
use Gearman\Async\Event\TaskDataEvent;
use Gearman\Async\TaskInterface;
use Gearman\Async\Factory;
require_once __DIR__ . "/../vendor/autoload.php";
// use default options
$factory = new Factory();
$factory->createClient("127.0.0.1", 4730)->then(
// on successful creation
function (ClientInterface $client) {
$client->submit("reverse", "Hallo Welt!")->then(function(TaskInterface $task) {
printf("Submitted: %s with \"%s\" [handle: %s]\n",
$task->getFunction(),
$task->getWorkload(),
$task->getHandle()
);
$task->on('complete', function (TaskDataEvent $event, ClientInterface $client) {
echo "Result: {$event->getData()}\n";
$client->disconnect();
});
});
},
// error-handler
function($error) {
echo "Error: $error\n";
}
);
$factory->getEventLoop()->run();