Fixed issue on (P)Redis with negative TTLs awaiting more specification of the PSR6 about this.

Author: Geolim4

src/phpFastCache/Drivers/Predis/Driver.php

@@ -74,7 +74,15 @@ protected function driverWrite(CacheItemInterface $item)
         if ($item instanceof Item) {
             $ttl = $item->getExpirationDate()->getTimestamp() - time();
 
-            return $this->instance->setex($item->getKey(), $ttl, $this->encode($this->driverPreWrap($item)));
+            /**
+             * @see https://redis.io/commands/setex
+             * @see https://redis.io/commands/expire
+             */
+            if($ttl <= 0){
+                return $this->instance->expire($item->getKey(), 0);
+            }else{
+                return $this->instance->setex($item->getKey(), $ttl, $this->encode($this->driverPreWrap($item)));
+            }
         } else {
             throw new phpFastCacheInvalidArgumentException('Cross-Driver type confusion detected');
         }

src/phpFastCache/Drivers/Redis/Driver.php

@@ -70,7 +70,15 @@ protected function driverWrite(CacheItemInterface $item)
         if ($item instanceof Item) {
             $ttl = $item->getExpirationDate()->getTimestamp() - time();
 
-            return $this->instance->setex($item->getKey(), $ttl, $this->encode($this->driverPreWrap($item)));
+            /**
+             * @see https://redis.io/commands/setex
+             * @see https://redis.io/commands/expire
+             */
+            if($ttl <= 0){
+                return $this->instance->expire($item->getKey(), 0);
+            }else{
+                return $this->instance->setex($item->getKey(), $ttl, $this->encode($this->driverPreWrap($item)));
+            }
         } else {
             throw new phpFastCacheInvalidArgumentException('Cross-Driver type confusion detected');
         }

tests/RedisExpireTtl0.test.php

@@ -0,0 +1,62 @@
+<?php
+
+/**
+ * @author Khoa Bui (khoaofgod)  <[email protected]> http://www.phpfastcache.com
+ * @author Georges.L (Geolim4)  <[email protected]>
+ */
+
+use phpFastCache\CacheManager;
+use phpFastCache\Helper\TestHelper;
+
+chdir(__DIR__);
+require_once __DIR__ . '/../vendor/autoload.php';
+$testHelper = new TestHelper('(P)Redis Expire TTL to 0');
+$cacheInstance = CacheManager::getInstance('Predis', []);
+$cacheKey = 'cacheKey';
+$RandomCacheValue = str_shuffle(uniqid('pfc', true));
+$loops = 10;
+
+$testHelper->printText('See https://redis.io/commands/setex');
+$testHelper->printText('See https://redis.io/commands/expire');
+$testHelper->printNewLine();
+
+for ($i = 0; $i <= $loops; $i++)
+{
+    $cacheItem = $cacheInstance->getItem("{$cacheKey}-{$i}");
+    $cacheItem->set($RandomCacheValue)
+      ->expiresAt(new DateTime());
+
+    $cacheInstance->saveDeferred($cacheItem);
+}
+
+try{
+    $cacheInstance->commit();
+    $testHelper->printPassText('The COMMIT operation has finished successfully');
+}catch (Predis\Response\ServerException $e){
+    if(strpos($e->getMessage(), 'setex')){
+        $testHelper->printFailText('The COMMIT operation has failed due to to an invalid time detection.');
+    }else{
+        $testHelper->printFailText('The COMMIT operation has failed due to to an unexpected error: ' . $e->getMessage());
+    }
+}
+$cacheInstance->detachAllItems();
+
+$testHelper->printText('Sleeping a second...');
+
+
+sleep(1);
+
+for ($i = 0; $i <= $loops; $i++)
+{
+    $cacheItem =  $cacheInstance->getItem("{$cacheKey}-{$i}");
+
+    if($cacheItem->isHit()){
+        $testHelper->printFailText(sprintf('The cache item "%s" is considered as HIT with the following value: %s', $cacheItem->getKey(), $cacheItem->get()));
+    }else{
+        $testHelper->printPassText(sprintf('The cache item "%s" is not considered as HIT.',  $cacheItem->getKey()));
+    }
+}
+
+$cacheInstance->clear();
+
+$testHelper->terminateTest();