null with PHP < and > operators
I would point you to a few pages: http://php.net/manual/en/types.comparisons.phphttp://php.net/manual/en/language.operators.comparison.phphttp://php.net/manual/en/language.types.boolean.php
So in your final example:
null<-1 => bool(true)The null is cast to false and the -1 is cast to true, false is less than true
In your first two examples null is cast to false and 0 is cast to false, false is not less than or greater than false but is equal to it.
Ohh the fun of null ! :D