As the RFC said.
https://wiki.php.net/rfc/generator-delegation
The defining feature of Generator functions is their support for
suspending execution for later resumption. This capability gives
applications a mechanism to implement asynchronous and concurrent
architectures even in a traditionally single-threaded language like
PHP. With simple userland task scheduling systems interleaved
generators become lightweight threads of execution for concurrent
processing tasks.
I wrote a small test. to see if it really concurrent processing any tasks.
the result looks bad. Still single blocking thread.
<?php
function delayYield()
{
$delay = mt_rand(1, 5);
echo "Delay $delay seconds" . PHP_EOL;
sleep($delay);
yield date('Y-m-d H:i:s');
}
function demoYield()
{
yield from delayYield();
yield from delayYield();
yield from delayYield();
return delayYield();
}
foreach (demoYield() as $v) {
echo $v . PHP_EOL;
}
the executed result:
Delay 3 seconds
2015-12-07 07:04:12
Delay 4 seconds
2015-12-07 07:04:16
Delay 1 seconds
2015-12-07 07:04:17
What is concurrent processing as you know?
http://docs.hhvm.com/hack/async/introduction
HHVM async described well .
Appreciate your time.
----------------------------
Netroby
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