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4.x is outdated, please check the latest version 22.x
Latest version:
pecl install openswoole-22.1.2
<?php Swoole\Coroutine\Channel->length(): int
Returns an integer of how many items are currently in the channel.
Gets the length of queue in the Channel.
<?php
Co\run(function() {
$data = 'Hello World!';
$chan = new chan(1);
$chan->push($data);
$pop = $chan->pop();
var_dump($chan->length());
});