use benevolent union for stream_get_contents() to prevent strict-rules errors

Author: staabm

src/Type/Php/StreamGetContentsFunctionReturnTypeExtension.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Bug13289;
+
+class HelloWorld
+{
+	/**
+	 * @param resource $resource
+	 **/
+	public function base64Response($resource): string
+	{
+		$content = stream_get_contents($resource);
+
+		if (false === $content) {
+			throw new \UnexpectedValueException('Invalid content given');
+		}
+
+		return base64_encode($content);
+	}
+}