Lines Matching refs:null
21 * @var string|null
34 if ($this->value === null) {
42 return $this->value !== null;
47 * @param null|string $value
53 if ($value !== null && !is_string($value)) {
60 * form don't return null only empty string
61 * equivalent to null
66 if ($possibleValues !== null) {
86 if ($value === null || $value === "") {
87 $this->value = null;
100 return null;