Adjust Header to be non Nul Terminated

file/php/Recording.php

@@ -5,7 +5,7 @@ namespace germanairlinesva_recording;
 class Recording
 {
   private const ident = "VGAR";
-  private const header_unpack = "Z5ident/Cversion";
+  private const header_unpack = "a4ident/Cversion";
   private const segment_unpack = "Vtime/Saltitude/Sgroundspeed/elatitude/elongitude";
 
   private string $file_name;
@@ -122,7 +122,7 @@ class Recording
       throw new \InvalidArgumentException(sprintf('Argument must be a valid resource type. %s given.', gettype($file)));
     }
 
-    $header = unpack(Recording::header_unpack, fread($file, 6));
+    $header = unpack(Recording::header_unpack, fread($file, 5));
 
     if ($header["ident"] !== Recording::ident) {
       throw