public FormStateInterface::setTemporaryValue($key, $value)
Sets an arbitrary value in temporary storage.
string|array $key: Properties are often stored as multi-dimensional associative arrays. If $key is a string, it will use $temporary[$key] = $value. If $key is an array, each element of the array will be used as a nested key. If $key = ['foo', 'bar'] it will use $temporary['foo']['bar'] = $value.
mixed $value: The value to set.
$this
public function setTemporaryValue($key, $value);
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