NULL
The special NULL value represents a variable with 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().
Syntax
There is only one value of type null, and that is the
case-insensitive constant NULL.
<?php
$var = NULL;
?>
Casting to NULL
Casting a variable to null using (unset) $var
will not remove the variable or unset its value.
It will only return a NULL value.
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