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4.x is outdated, please check the latest version 22.x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\Atomic->sub ( int $value = 0 )
The subtraction value to the atomic counter.
Subtract a value to the a Atomic counter.
<?php
$counter = new Swoole\Atomic(123);
echo $counter->add(12)."\n";
echo $counter->sub(11)."\n";
echo $counter->cmpset(122, 999)."\n";
echo $counter->cmpset(124, 999)."\n";
echo $counter->get()."\n";