diff --git a/src/main/php/websocket/protocol/Opcodes.class.php b/src/main/php/websocket/protocol/Opcodes.class.php
index 497fdc4..7ca9870 100755
--- a/src/main/php/websocket/protocol/Opcodes.class.php
+++ b/src/main/php/websocket/protocol/Opcodes.class.php
@@ -28,6 +28,6 @@ public static function nameOf($opcode) {
       self::PONG   => 'PONG',
     ];
 
-    return isset($opcodes[$opcode]) ? $opcodes[$opcode] : sprintf('UNKNOWN(0x%02x)', ord($opcode));
+    return $opcodes[$opcode] ?? sprintf('UNKNOWN(0x%02x)', ord($opcode));
   }
 }
\ No newline at end of file