FIX

.gitignore

@@ -1 +1,3 @@
 /.idea/
+/vendor/
+composer.lock

src/PrettyCSV/Csv.php

@@ -107,11 +107,11 @@ class Csv implements Iterator {
             $csvColumnIndex = 0;
             foreach (str_getcsv($this->currentLine, $this->separator, $this->enclosure, $this->escape) as $csvColumnName) {
                 if(!array_key_exists($csvColumnName, $this->headerList)) {
-                    $this->headerList[$csvColumnName] = (new HeaderColumn())->setName($csvColumnName);
+                    $this->headerList[$csvColumnName] = new HeaderColumn($csvColumnName);
                 }
                 $this->headerList[$csvColumnName]->setIndex($csvColumnIndex);
-                if(array_key_exists($csvColumnName, $expectedColumns)) {
-                    unset($expectedColumns[$csvColumnName]);
+                if(in_array($csvColumnName, $expectedColumns)) {
+                    unset($expectedColumns[array_search($csvColumnName, $expectedColumns)]);
                 }
                 $csvColumnIndex++;
             }
@@ -134,9 +134,9 @@ class Csv implements Iterator {
     }
 
     /**
-     * @return array|CsvLine
+     * @return mixed
      */
-    public function current() {
+    public function current() : mixed {
         $line = str_getcsv($this->currentLine, $this->separator, $this->enclosure, $this->escape);
         if(!$this->hasHeader) return $line;
         return new CsvLine($line, $this->currentRow, $this->headerList);
@@ -152,7 +152,7 @@ class Csv implements Iterator {
     /**
      * @return void
      */
-    public function next() {
+    public function next() : void {
         $this->currentLine = fgets($this->fp, $this->length);
         $this->currentRow++;
     }
@@ -160,7 +160,7 @@ class Csv implements Iterator {
     /**
      * @return void
      */
-    public function rewind() {
+    public function rewind() : void {
         fseek($this->fp, $this->dataStartPoint, SEEK_SET);
         $this->currentRow = 0;
         $this->next();

src/PrettyCSV/CsvLine.php

@@ -9,6 +9,7 @@ use PrettyCSV\Interfaces\TypeParserInterface;
 use PrettyCSV\Parsers\ParserException;
 use ArrayObject;
 use ArrayIterator;
+use Iterator;
 
 class CsvLine extends ArrayObject {
 
@@ -25,7 +26,7 @@ class CsvLine extends ArrayObject {
     /**
      * @var HeaderColumnInterface[]
      */
-    protected array $headers = [];
+    protected array $headerList = [];
 
     /**
      * @var array
@@ -35,38 +36,38 @@ class CsvLine extends ArrayObject {
     /**
      * @param array $currentLine
      * @param int $currentRow
-     * @param array $headers
+     * @param array $headerList
      */
     public function __construct(
         array $currentLine,
         int $currentRow,
-        array $headers
+        array $headerList
     ){
         $this->currentLine = $currentLine;
         $this->currentRow = $currentRow;
-        $this->headers = $headers;
+        $this->headerList = $headerList;
     }
 
     /**
      * @param string $name
      * @return bool
      */
-    private function existsField(string $name) {
-        return array_key_exists($name, $this->headers) && !is_null($this->headers[$name]->getIndex());
+    private function existsField(string $name): bool {
+        return array_key_exists($name, $this->headerList) && !is_null($this->headerList[$name]->getIndex());
     }
 
     /**
      * @param string $name
-     * @return mixed|null
+     * @return mixed
      * @throws ParserException
      */
-    private function getField(string $name) {
+    private function getField(string $name): mixed {
         if(!$this->existsField($name)) {
             throw new ParserException("Field '{$name}' not found", $this->currentRow);
         }
-        $index = $this->headers[$name]->getIndex();
+        $index = $this->headerList[$name]->getIndex();
         /** @var TypeParserInterface $parser */
-        $parser = $this->headers[$name]->getParser();
+        $parser = $this->headerList[$name]->getParser();
         if(!array_key_exists($name, $this->parsedDataCache)) {
             if(!array_key_exists($index, $this->currentLine)) return null;
             $data = $this->currentLine[$index];
@@ -95,10 +96,10 @@ class CsvLine extends ArrayObject {
 
     /**
      * @param $key
-     * @return mixed|null
+     * @return mixed
      * @throws ParserException
      */
-    public function offsetGet($key) {
+    public function offsetGet($key) : mixed {
         return $this->getField($key);
     }
 
@@ -116,8 +117,8 @@ class CsvLine extends ArrayObject {
      */
     public function getArrayCopy(): array {
         $result = [];
-        foreach ($this->headers as $name => $header) {
-            if (!is_null($header->getIndex())) {
+        foreach ($this->headerList as $name => $header) {
+            if (is_null($header->getIndex())) {
                 continue;
             }
             $result[$name] = $this->getField($name);
@@ -126,10 +127,10 @@ class CsvLine extends ArrayObject {
     }
 
     /**
-     * @return ArrayIterator
+     * @return Iterator
      * @throws ParserException
      */
-    public function getIterator() {
+    public function getIterator() : Iterator {
         return new ArrayIterator($this->getArrayCopy(), $this->getFlags());
     }
 
@@ -137,7 +138,7 @@ class CsvLine extends ArrayObject {
      * @return array
      * @throws ParserException
      */
-    public function __debugInfo() {
+    public function __debugInfo() : array {
         return $this->getArrayCopy();
     }
 

src/PrettyCSV/HeaderColumn.php

@@ -29,6 +29,21 @@ class HeaderColumn implements HeaderColumnInterface {
      */
     private ?TypeParserInterface $parser;
 
+    /**
+     * @param string $name
+     * @param bool $is_required
+     * @param TypeParserInterface|null $parser
+     */
+    public function __construct(
+        string $name,
+        bool $is_required = false,
+        ?TypeParserInterface $parser = null
+    ) {
+        $this->name = $name;
+        $this->is_required = $is_required;
+        $this->parser = $parser;
+    }
+
     /**
      * @inheritDoc
      */

src/PrettyCSV/Parsers/ListParser.php

@@ -7,7 +7,7 @@ namespace PrettyCSV\Parsers;
 use PrettyCSV\Interfaces\TypeParserInterface;
 use DateTime;
 
-class DateTimeParser implements TypeParserInterface {
+class ListParser implements TypeParserInterface {
 
     /**
      * @var string