Redefined getCharset() method to return SyntaxID instead.

Charset detection is basically impossible and misleading at best.
Best not report something that might be wrong.

Author: gaxweb

src/EDI/Parser.php

@@ -81,9 +81,9 @@ class Parser
     private $stringSafe = '§SS§';
 
     /**
-     * @var string|null Syntax identifier
+     * @var string UNB Syntax identifier
      */
-    private $syntaxID = 'UNOB';
+    private string $syntaxID = '';
 
     /**
      * @var string|null Message format from UNH
@@ -273,21 +273,25 @@ public function analyseUNH(array $line): void
     }
 
     /**
-     * Check if the encoding of the text actually matches the one declared by the UNB syntax identifier.
+     * Check if the file's character encoding actually matches the one declared in the UNB header.
      *
+     * @throws \LogicException
      * @throws \RuntimeException
      */
     public function checkEncoding(): bool
     {
         if (empty($this->parsedfile)) {
-            throw new \RuntimeException('No text has been parsed yet');
+            throw new \LogicException('No text has been parsed yet');
         }
-
         if (! isset(self::$charsets[$this->syntaxID])) {
             throw new \RuntimeException('Unsupported syntax identifier: ' . $this->syntaxID);
         }
 
-        return mb_check_encoding($this->parsedfile, self::$charsets[$this->syntaxID]);
+        $check = mb_check_encoding($this->parsedfile, self::$charsets[$this->syntaxID]);
+        if(!$check)
+            $this->errors[] = 'Character encoding does not match declaration in UNB interchange header';
+
+        return $check;
     }
 
     /**
@@ -329,21 +333,15 @@ public function getRawSegments(): array
     }
 
     /**
-     * Get character encoding extracted from UNB header
+     * Get syntax identifier from the UNB header.
+     * Does not necessarily mean that the text is actually encoded as such.
      *
      * @return string
+     * @throws \RuntimeException
      */
-    public function getCharset(): string
+    public function getSyntaxIdentifier(): string
     {
-        if (empty($this->parsedfile)) {
-            throw new \RuntimeException('No text has been parsed yet');
-        }
-
-        if (! isset(self::$charsets[$this->syntaxID])) {
-            throw new \RuntimeException('Unsupported syntax identifier: ' . $this->syntaxID);
-        }
-
-        return self::$charsets[$this->syntaxID];
+        return $this->syntaxID;
     }
 
     /**
@@ -457,7 +455,7 @@ private function resetUNA(): void
      */
     private function resetUNB(): void
     {
-        $this->syntaxID = 'UNOB';
+        $this->syntaxID = '';
         $this->unbChecked = false;
     }