The special NULL value represents a variable has no value
(nonvalue or unvalue). It is similar to Python's" None" or
NULL is the only possible value of type NULL.
It identifies variables being empty or not and useful to
differentiate between the empty string and null values of
There is only one value of type
NULL, and that is the case-insensitive keyword NULL.
The following is an example of using NULL.
Syntax to define php null type
$value = NULL;
The following example $Var1 set to NULL and a subsequent if
statement checks whether it is NULL or not.
echo 'Welcome to w3hello.com';
Welcome to w3hello.com