What is NULL in php?
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NULL is a unique data type that can only have one value. A variable with the data type NULL has no value associated with it. It can be assigned in the following way:
$var = NULL;
By tradition, the special constant NULL is capitalized, but it is case insensitive. As a result, you could also write it as:
$var = null;
A variable that has been assigned the NULL value consists of the following properties:
In a Boolean context, it evaluates to FALSE.
When tested using the IsSet() function, it returns FALSE.