|
|
Tutorials » Php »
|
Topic |
How to define an NULL variable and assign value?
|
|
Explanation |
The special NULL value represents that a variable has no value. NULL is the only possible value of type NULL.
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()
There is only one value of type NULL, and that is the case-insensitive keyword NULL. NULL variable can be declared as
$var = NULL;
Here the variable hold the Null value so it is of type NULL.
If you want to get a type of a variable, you can use gettype() function.
Is_Null() function is used to find whether the variable is Null variable or not. This function returns true if it is Null variable otherewise return false.
|
|
|
|
Home
Scripts
Tutorials
Images
Tools
Purchase
Snippets
