Extended core support by implementing FCALL_RO command (#1191)

examples/Commands/fcall_ro.php

@@ -0,0 +1,43 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) 2009-2020 Daniele Alessandri
+ * (c) 2021-2023 Till Krüss
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Predis\Client;
+
+require __DIR__ . '/../shared.php';
+
+// Example of FCALL_RO command usage:
+
+// 1. Set key-value pair
+$client = new Client($single_server);
+$client->set('foo', 'bar');
+
+echo "Set key 'foo' with value 'bar'\n";
+
+// 2. Load redis function with 'no-writes' flag
+$client->function->load(
+    "#!lua name=mylib
+                redis.register_function{
+                    function_name='myfunc',
+                    callback=function(keys, args) return redis.call('GET', keys[1]) end,
+                    flags={'no-writes'}
+                }"
+);
+
+echo 'Loaded custom function that perform GET command against provided key.' . "\n";
+
+// 3. Call function above with given key
+$response = $client->fcall_ro('myfunc', ['foo']);
+
+echo "Function returned value against provided key 'foo' is '{$response}'";
+
+// 4. Delete test library
+$client->function->delete('mylib');