PDFObject: fixed introduced syntax errors in older PHP versions; refi…

…ned comment in Font.php

src/Smalot/PdfParser/Font.php

@@ -287,8 +287,12 @@ public function calculateTextWidth(string $text, ?array &$missing = null): ?floa
         // Usually, Widths key is set in $details array, but if it isn't use an empty array instead.
         $widths = $details['Widths'] ?? [];
 
-        // Widths array is zero indexed but table is not. We must map them based on FirstChar and LastChar
-        // note: in some cases the values for FirstChar or LastChar are null here
+        /*
+         * Widths array is zero indexed but table is not. We must map them based on FirstChar and LastChar
+         *
+         * Note: Without the change you would see warnings in PHP 8.4 because the values of FirstChar or LastChar
+         *       can be null sometimes.
+         */
         $width_map = array_flip(range((int) $details['FirstChar'], (int) $details['LastChar']));
 
         $width = null;

src/Smalot/PdfParser/PDFObject.php

@@ -82,7 +82,7 @@ public function __construct(
         Document $document,
         ?Header $header = null,
         ?string $content = null,
-        ?Config $config = null,
+        ?Config $config = null
     ) {
         $this->document = $document;
         $this->header = $header ?? new Header();
@@ -1144,7 +1144,7 @@ public static function factory(
         Document $document,
         Header $header,
         ?string $content,
-        ?Config $config = null,
+        ?Config $config = null
     ): self {
         switch ($header->get('Type')->getContent()) {
             case 'XObject':