Web Reference: Setting a variable to NULL is telling it to forget its value without providing a replacement value to remember instead. The variable remains so that you can give it a proper value to remember later; this is especially important when the variable is an array element or object property. PHP Data Types Variables can store data of different types, and different data types can do different things. PHP supports the following data types: string (text values) int (whole numbers) float (decimal numbers) bool (true or false) array (multiple values) object (stores data as objects) null (empty variable) resource (references external ... 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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