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[Music] null is a special data type that represents a variable with no value a variable can be a null if its assigned the constant null it has not been defined yet or it has been unset lets go over all the three options so the first one is null constant so you could have a variable assigned to a null constant and this is a predefined constant that is case insensitive which means that you could use null uppercase or lowercase or whatever you like i personally prefer null or lowercase lets echo this out and we get nothing and thats expected because when echoing something out it is first cast into a string and when null gets cast to a string it will be converted to an empty string and thats why we see nothing on the screen we can use var dump to ensure that its actually null so lets change this to bar dump x and refresh and we get no you could also use a function called is no to check if a variable is actually null or not so if we refresh that we get boolean true and if we change
