public &FormState::get($property)
Gets any arbitrary property.
string|array $property: Properties are often stored as multi-dimensional associative arrays. If $property is a string, it will return $storage[$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 $storage['foo']['bar'].
mixed A reference to the value for that property, or NULL if the property does not exist.
Overrides FormStateInterface::get
public function &get($property) { $value = &NestedArray::getValue($this->storage, (array) $property); return $value; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormState.php/function/FormState::get/8.1.x