Improved public API in VisitLocation entity, reducing anemic model

module/Common/functions/functions.php

@@ -3,7 +3,9 @@ declare(strict_types=1);
 
 namespace Shlinkio\Shlink\Common;
 
+use const ARRAY_FILTER_USE_KEY;
 use const JSON_ERROR_NONE;
+use function array_filter;
 use function getenv;
 use function in_array;
 use function json_decode as spl_json_decode;
@@ -52,6 +54,19 @@ function contains($needle, array $haystack): bool
     return in_array($needle, $haystack, true);
 }
 
+/**
+ * Returns only the keys in keysToPick from provided array
+ *
+ * @param array $array
+ * @param array $keysToPick
+ */
+function pick(array $array, array $keysToPick): array
+{
+    return array_filter($array, function (string $key) use ($keysToPick) {
+        return contains($key, $keysToPick);
+    }, ARRAY_FILTER_USE_KEY);
+}
+
 /**
  * @throws Exception\InvalidArgumentException
  */