![]() The data includes price, size, and discounts (If applicable). For that, we have an API for retrieving products data. Let’s assume we’re building an online store that deals in footwear. Next, we see a scenario where the isset function is helpful. This is pretty much all about the PHP isset function. So, the function returns true because all the values are set. Advertisements "Mike","Department"=>"IT","Skills"=> ] We can refactor this code as we did in the previous example. PHP isset function works the same way for array elements. Nothing surprising because the variable is null and thus isset returns false. Well, before we move on to see arrays with isset, let’s see an example where the function returns false. Since all the variables are set, It returns true. Remember we can pass multiple parameters to the isset function. ![]() There’s a way to refactor this code and shorten it. An empty string is different than a null that’s why the function returns true. Well, by the definition of PHP isset function, it returns false for null only. Some newbies might wonder why it returns true for the empty string variable. We have several variables in the example and we’ll pass each of these to the isset function to see the output. Let’s explore the PHP isset function by examples. Advertisements Examples of PHP isset function The isset function returns false instead of raising an exception or warning for an undeclared variable. It evaluates the parameters from left to right and returns false on encountering an unset variable. Returns true if var exists and has a value other than null, else returns false.įor multiple parameters, the isset function returns true only if all these are set. ![]() ![]() Function Signature isset(mixed $var, mixed …$vars) : bool PHP isset function determines if a variable is declared and is different than null.
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