What is the difference between !empty() and isset()?
!empty will return false if a variable is set to null, where as isset will return true.
How do you use Jquery to iterate over a set of objects
How do you get the address of a variable, and how do you get a value at an address?
The ampersand is used to get an address of a variable and the asterisk is used to dereference a variable from an address.