In PHP, a variable with no value is said to be of null data type. Such a variable has a value defined as NULL. A variable can be explicitly assigned NULL or its value been set to null by using unset() function. Syntax. $var=NULL; It is possible to cast variable of other type to null, although casting null to other type has been deprecated from PHP 7.2. In earlier versions, casting was done using (unset)$var syntax.
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- It's not a jumped-up zero or empty set. This is why a variable containing a NULL is considered to be unset: it doesn't have a value.
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- However, the null PHP data type word can be used as a not case-sensitive, so it can be NULL, Null, or null value.
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is_null=== nullnull========