Add parameter to method

Author: hakobyansen

README.md

@@ -348,8 +348,13 @@ array(3) {
 }
 ```
 
-Though, if you want to keep array keys format to be same as class fields, you can pass false to `toArray` method:
-`$arr = $dto->toArray(false);` or `$arr = $dto->toArray(toSnakeCase: false);`
+`toArray` method accepts two parameters: `toSnakeCase` and `includeNulls`:
+
+If you want to keep array keys format to be same as class fields, you can pass `toSnakeCase: false` parameter:
+`$arr = $dto->toArray(toSnakeCase: false);`
+
+If you want to include keys with `null` values, you can pass `includeNulls: true` parameter:
+`$arr = $dto->toArray(includeNulls: true);`
 
 The output then will be:
 ```

src/ToArray.php

@@ -8,9 +8,10 @@ trait ToArray
 
 	/**
 	 * @param bool $toSnakeCase
+	 * @param bool $includeNulls
 	 * @return array
 	 */
-	public function toArray(bool $toSnakeCase = true): array
+	public function toArray(bool $toSnakeCase = true, bool $includeNulls = false): array
 	{
 		$arr = self::castToArray($this);
 
@@ -22,7 +23,10 @@ public function toArray(bool $toSnakeCase = true): array
 			{
 				$key = ltrim(strtolower(preg_replace('/[A-Z]([A-Z](?![a-z]))*/', '_$0', $key)), '_');
 
-				$result[$key] = $value;
+				if($value !== null || $includeNulls)
+				{
+					$result[$key] = $value;
+				}
 			}
 
 			return $result;