feat(Speech): add list recognizers sample

Author: bshaffer

speech/src/list_recognizers.php

@@ -0,0 +1,52 @@
+<?php
+/**
+ * Copyright 2023 Google LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace Google\Cloud\Samples\Speech;
+
+use Google\Cloud\Speech\V2\Client\SpeechClient;
+use Google\Cloud\Speech\V2\ListRecognizersRequest;
+use Google\Cloud\Speech\V2\Recognizer;
+
+/**
+ * List all recognizers.
+ *
+ * @param string $projectId The Google Cloud project ID.
+ * @param string $location The location of the recognizer.
+ */
+function list_recognizers(
+    string $projectId,
+    string $location,
+): void {
+    $apiEndpoint = $location === 'global' ? null : sprintf('%s-speech.googleapis.com', $location);
+    $speech = new SpeechClient(['apiEndpoint' => $apiEndpoint]);
+
+    // Create the ListRecognizersRequest
+    $ListRecognizersRequest = new ListRecognizersRequest([
+        'parent' => SpeechClient::locationName($projectId, $location),
+    ]);
+
+    // Call the ListRecognizers method
+    $responses = $speech->listRecognizers($ListRecognizersRequest);
+
+    foreach ($responses as $recognizer) {
+        printf('Recognizer name: %s' . PHP_EOL, $recognizer->getName());
+    }
+}
+
+// The following 2 lines are only needed to run the samples
+require_once __DIR__ . '/../../testing/sample_helpers.php';
+\Google\Cloud\Samples\execute_sample(__FILE__, __NAMESPACE__, $argv);