Redis counting semaphore 
redis-counting-semaphore is a package with a counting semaphore implementation for PHP.
It uses redis as a central broker., (*1)
Installation
To install redis-counting-semaphore with composer:, (*2)
composer require code-orange/redis-counting-semaphore
Usage
First, make sure you have a Predis connection instance., (*3)
You can create and attempt to obtain a semaphore like so:, (*4)
<?php
use CodeOrange\RedisCountingSemaphore\Semaphore;
$client = new Predis\Client();
// Create a counting semaphore with a limit of 3
$sem = new Semaphore($client, 'semaphore-name', 3);
if ($sem->acquire(0.1, 10)) {
// Obtained the semaphore
use_limited_resource();
$sem->release();
} else {
// We weren't able to get a semaphore, even though we tried 10 times
// And slept for 0.1 seconds in between tries
}
API
/**
* Semaphore constructor.
* @param Client $client Predis client with an open connection
* @param string $name Name of the semaphore
* @param int $limit The amount of resources this semaphore protects
* @param int $timeout Timeout of an acquired semaphore, in seconds
*/
public Semaphore(Client $client, $name, $limit = 1, $timeout = 10);
/**
* Try to acquire a semaphore
*
* @param float $sleep Number of seconds to sleep between retries. If null, this function will not retry but return immediately.
* @param int $retries Number of times to retry before giving up
* @return bool Whether or not the semaphore was acquired correctly
*/
public function acquire($sleep = null, $retries = null);
/**
* Release this semaphore
*
* @return void
*/
public function release();
/**
* Refresh the semaphore
*
* @return bool Whether or not we still have the semaphore
*/
public function refresh();
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