comparison vendor/symfony/validator/Constraints/RangeValidator.php @ 17:129ea1e6d783

Update, including to Drupal core 8.6.10

         // Convert strings to DateTimes if comparing another DateTime
         // This allows to compare with any date/time value supported by
         // the DateTime constructor:
         // http://php.net/manual/en/datetime.formats.php
         if ($value instanceof \DateTimeInterface) {
-            if (is_string($min)) {
+            if (\is_string($min)) {
                 $min = new \DateTime($min);
             }
 
-            if (is_string($max)) {
+            if (\is_string($max)) {
                 $max = new \DateTime($max);
             }
         }
 
         if (null !== $constraint->max && $value > $max) {