Rename variable to use camelcase format

Signed-off-by: Maurício Meneghini Fauth <mauricio@fauth.dev>

Author: MauricioFauth

src/ShapeFile.php

@@ -304,20 +304,20 @@ public function getIndexFromDBFData(string $field, string $value): int
      */
     private function loadDBFHeader(): array
     {
-        $DBFFile = fopen($this->getFilename('.dbf'), 'r');
-        if ($DBFFile === false) {
+        $dbfFile = fopen($this->getFilename('.dbf'), 'r');
+        if ($dbfFile === false) {
             return [];
         }
 
         $result = [];
         $i = 1;
 
         while (true) {
-            if (feof($DBFFile)) {
+            if (feof($dbfFile)) {
                 break;
             }
 
-            $buff32 = fread($DBFFile, 32);
+            $buff32 = fread($dbfFile, 32);
             if ($i > 1) {
                 if (substr($buff32, 0, 1) === chr(13)) {
                     break;
@@ -337,7 +337,7 @@ private function loadDBFHeader(): array
             ++$i;
         }
 
-        fclose($DBFFile);
+        fclose($dbfFile);
 
         return $result;
     }