Added Memcached::OPT_PREFIX_KEY option support (fixed #744)

Author: Geolim4

lib/Phpfastcache/Drivers/Memcached/Config.php

@@ -57,6 +57,11 @@ class Config extends ConfigurationOption
      */
     protected $saslPassword = '';
 
+    /**
+     * @var string
+     */
+    protected $optPrefix = '';
+
     /**
      * @return string
      */
@@ -161,4 +166,24 @@ public function setPort(int $port): self
         $this->port = $port;
         return $this;
     }
+
+    /**
+     * @return string
+     * @since 8.0.2
+     */
+    public function getOptPrefix(): string
+    {
+        return $this->optPrefix;
+    }
+
+    /**
+     * @param string $optPrefix
+     * @return Config
+     * @since 8.0.2
+     */
+    public function setOptPrefix(string $optPrefix): Config
+    {
+        $this->optPrefix = trim($optPrefix);
+        return $this;
+    }
 }

lib/Phpfastcache/Drivers/Memcached/Driver.php

@@ -87,7 +87,13 @@ public function getStats(): DriverStatistic
     protected function driverConnect(): bool
     {
         $this->instance = new MemcachedSoftware();
+        $optPrefix = $this->getConfig()->getOptPrefix();
         $this->instance->setOption(MemcachedSoftware::OPT_BINARY_PROTOCOL, true);
+
+        if ($optPrefix) {
+            $this->instance->setOption(MemcachedSoftware::OPT_PREFIX_KEY, $optPrefix);
+        }
+
         $servers = $this->getConfig()->getServers();
 
         if (count($servers) < 1) {