public FormState::has($property)
Determines if an arbitrary property is present.
string $property: Properties are often stored as multi-dimensional associative arrays. If $property is a string, it will return isset($storage[$property]). If $property is an array, each element of the array will be used as a nested key. If $property = ['foo', 'bar'] it will return isset($storage['foo']['bar']).
Overrides FormStateInterface::has
public function has($property) { $exists = NULL; NestedArray::getValue($this->storage, (array) $property, $exists); return $exists; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormState.php/function/FormState::has/8.1.x