https://stackoverflow.com/questions/6905491/how-to-tell-whether-a-variable-is-null-or-undefined-in-php https://stackoverflow.com/questions/6905491/how-to-tell-w

https://stackoverflow.com/questions/6905491/how-to-tell-whether-a-variable-is-null-or-undefined-in-php https://stackoverflow.com/questions/6905491/how-to-tell-whet... At the language level PHP has about the same problems as JS. Thankfully it looks uglier so people get an early warning before using it for everything.