Add the 'prefix' client option. The client will automatically prepend the specified prefix string to each key.

examples/KeyPrefixes.php

@@ -8,10 +8,7 @@ require 'SharedConfigurations.php';
 // user-level namespaces for you keyspace, thus eliminating the need for separate
 // logical databases.
 
-use Predis\Commands\Processors\KeyPrefixProcessor;
-
-$client = new Predis\Client();
-$client->getProfile()->setProcessor(new KeyPrefixProcessor('nrk:'));
+$client = new Predis\Client($single_server, array('prefix' => 'nrk:'));
 
 $client->mset(array('foo' => 'bar', 'lol' => 'wut'));
 var_dump($client->mget('foo', 'lol'));

lib/Predis/Client.php

@@ -16,6 +16,9 @@ class Client {
         $options = $this->filterOptions($options);
         $this->_options = $options;
         $this->_profile = $options->profile;
+        if ($prefixer = $options->prefix) {
+            $this->_profile->setProcessor($prefixer);
+        }
         $this->_connectionFactory = $options->connections;
         $this->_connection = $this->initializeConnection($parameters);
     }

lib/Predis/ClientOptions.php

@@ -3,6 +3,7 @@
 namespace Predis;
 
 use Predis\Options\IOption;
+use Predis\Options\ClientPrefix;
 use Predis\Options\ClientProfile;
 use Predis\Options\ClientCluster;
 use Predis\Options\ClientConnectionFactory;
@@ -23,6 +24,7 @@ class ClientOptions {
             'profile' => new ClientProfile(),
             'connections' => new ClientConnectionFactory(),
             'cluster' => new ClientCluster(),
+            'prefix' => new ClientPrefix(),
         );
         return self::$_sharedOptions;
     }

lib/Predis/Options/ClientPrefix.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Predis\Options;
+
+use Predis\Commands\Processors\KeyPrefixProcessor;
+
+class ClientPrefix extends Option {
+    public function validate($value) {
+        return new KeyPrefixProcessor($value);
+    }
+}