Web Reference: A variable of data type NULL is a variable that has no value assigned to it. Tip: If a variable is created without a value, it is automatically assigned a value of NULL. NULL ¶ The null type is PHP's unit type, i.e. it has only one value: null. Undefined, and unset () variables will resolve to the value null. Aug 19, 2022 · It identifies variables being empty or not and useful to differentiate between the empty string and null values of databases. There is only one value of type NULL, and that is the case-insensitive keyword NULL.
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