isset – IT Nursery

Best way to test for a variable’s existence in PHP; isset() is clearly broken

June 2, 2022 by IT Nursery

From the isset() docs: isset() will return FALSE if testing a variable that has been set to NULL. Basically, isset() doesn’t check for whether the variable is set at all, but whether it’s set to anything but NULL. Given that, what’s the best way to actually check for the existence of a variable? I tried … Read more

JavaScript isset() equivalent

April 29, 2022 by IT Nursery

In PHP you can do if(isset($array[‘foo’])) { … }. In JavaScript you often use if(array.foo) { … } to do the same, but this is not exactly the same statement. The condition will also evaluate to false if array.foo does exists but is false or 0 (and probably other values as well). What is the … Read more