Returns TRUE if var is null, FALSE otherwise.
See the NULL type when a variable is considered to be NULL and when not.
See also NULL, is_bool(), is_numeric(), is_float(), is_int(), is_string(), is_object(), is_array(), is_integer(), and is_real().
| Пред. | Начало | След. |
| is_long | Уровень выше | is_numeric |
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