Use full namespace in function checks

Author: shadowhand

src/StreamFactory.php

@@ -7,39 +7,37 @@
 use Psr\Http\Message\StreamFactoryInterface;
 use Psr\Http\Message\StreamInterface;
 
+use function function_exists;
 use function GuzzleHttp\Psr7\stream_for;
 use function GuzzleHttp\Psr7\try_fopen;
 
 class StreamFactory implements StreamFactoryInterface
 {
     public function createStream(string $content = ''): StreamInterface
     {
-        if (\function_exists('stream_for')) {
+        if (function_exists('GuzzleHttp\Psr7\stream_for')) {
             // fallback for guzzlehttp/psr7<1.7.0
             return stream_for($content);
         }
+
         return Utils::streamFor($content);
     }
 
     public function createStreamFromFile(string $file, string $mode = 'r'): StreamInterface
     {
-        if (\function_exists('try_fopen') && \function_exists('steam_for')) {
+        if (function_exists('GuzzleHttp\Psr7\try_fopen')) {
             // fallback for guzzlehttp/psr7<1.7.0
             $resource = try_fopen($file, $mode);
-
-            return stream_for($resource);
+        } else {
+            $resource = Utils::tryFopen($file, $mode);
         }
-        $resource = Utils::tryFopen($file, $mode);
 
-        return new Stream($resource);
+
+        return $this->createStreamFromResource($resource);
     }
 
     public function createStreamFromResource($resource): StreamInterface
     {
-        if (\function_exists('stream_for')) {
-            // fallback for guzzlehttp/psr7<1.7.0
-            return stream_for($resource);
-        }
         return new Stream($resource);
     }
 }