chore: improve streaming example (#110)

Author: ms-jpq

examples/messages_stream.php

@@ -6,6 +6,11 @@
 
 use Anthropic\Client;
 use Anthropic\Messages\MessageParam;
+use Anthropic\Messages\RawContentBlockDeltaEvent;
+use Anthropic\Messages\RawContentBlockStartEvent;
+use Anthropic\Messages\RawMessageDeltaEvent;
+use Anthropic\Messages\RawMessageStartEvent;
+use Anthropic\Messages\RawMessageStopEvent;
 
 $client = new Client(
     apiKey: getenv("ANTHROPIC_API_KEY") ?: "my-anthropic-api-key"
@@ -18,5 +23,30 @@
 );
 
 foreach ($stream as $event) {
-    var_dump($event);
+    switch (true) {
+        case $event instanceof RawMessageStartEvent: {
+            var_dump($event->message);
+            break;
+        }
+        case $event instanceof RawMessageDeltaEvent: {
+            var_dump($event->delta);
+            break;
+        }
+        case $event instanceof RawMessageStopEvent: {
+            var_dump($event->toArray());
+            break;
+        }
+        case $event instanceof RawContentBlockStartEvent: {
+            var_dump($event->contentBlock);
+            break;
+        }
+        case $event instanceof RawContentBlockDeltaEvent: {
+            var_dump($event->delta);
+            break;
+        }
+        default: {
+            var_dump($event->type);
+            break;
+        }
+    }
 }