Delete PHP section from README

Removed PHP code example from README.md

Author: clegginabox

README.md

@@ -141,80 +141,6 @@ $airlock->withAdmitted('job:invoice', function () {
 });
 ```
 
-## PHP
-
-```php
-
-use Clegginabox\Airlock\Notifier\NullAirlockNotifier;
-use Clegginabox\Airlock\Seal\LockSeal;
-use Clegginabox\Airlock\Seal\SemaphoreSeal;
-use Clegginabox\Airlock\QueueAirlock;
-use Clegginabox\Airlock\Queue\RedisFifoQueue;
-use Redis;
-use Symfony\Component\Lock\LockFactory;
-use Symfony\Component\Semaphore\SemaphoreFactory;
-
-$redis = new Redis();
-$redis->connect('172.17.0.2');
-
-// Semaphore allows more than 1 user to enter at a time
-$seal = new SemaphoreSeal(
-    factory: new SemaphoreFactory(
-        new \Symfony\Component\Semaphore\Store\RedisStore($redis)
-    ),
-    resource: 'my_airlock',
-    limit: 10,
-    weight: 1,
-    ttlInSeconds: 900,
-    autoRelease: false
-);
-
-$seal = new LockSeal(
-    factory: new LockFactory(
-        new \Symfony\Component\Lock\Store\RedisStore($redis)
-    ),
-    resource: 'my_airlock',
-    ttlInSeconds: 900,
-    autoRelease: false
-);
-
-// RedisFifoQueue (fair) or RedisLotteryQueue (random)
-$queue = new RedisFifoQueue($redis);
-
-// NullAirlockNotifier or MercureAirlockNotifier
-$notifier = new NullAirlockNotifier();
-
-// QueueAirlock or a free for all with OpportunisticAirlock
-$airlock = new QueueAirlock(
-    seal: $seal,
-    queue: $queue,
-    notifier: $notifier,
-    topicPrefix: '/my_airlock'
-);
-
-// Try and enter the airlock
-$result = $airlock->enter($userId);
-
-if ($result->isAdmitted()) {
-    // Get the seal token
-    $token = $result->getToken();
-    
-    // ... Do your protected work ...
-    
-    // Heartbeat: Extend lease by another 5 minutes
-    $airlock->refresh($token, 300);
-    
-    // Done? Let the next person in!
-    $airlock->release($token);
-} else {
-    // Access Denied! Join the line
-    $queuePosition = $airlock->getPosition($userId);
-    
-    // Bored of waiting?
-    $airlock->leave($userId);
-}
-```
-
 ## Symfony bundle
 
 Register the bundle (if not using Flex):