PHP-manual | ||
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Föregående | Kapitel 6. Types | Nästa |
The special NULL value represents that a variable has no value. NULL is the only possible value of type NULL.
Not: The null type was introduced in PHP 4
A variable is considered to be NULL if
it has been assigned the constant NULL.
it has not been set to any value yet.
it has been unset().
Föregående | Hem | Nästa |
Resource | Upp | Pseudo-types used in this documentation |