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