On Wed, Mar 13, 2013 at 4:44 PM, Angela Barone <angela@xxxxxxxxxxxxxxxxxxxx>wrote: > I ran across if(array_key_exists) and it seems to work. How does that > differ from if(isset($states[$state]))? Hi Angela, isset() will return false for an array key 'foo' mapped to a null value whereas array_key_exists() will return true. The latter asks "Is this key in the array?" whereas isset() adds "and is its value not null?" While isset() is every-so-slightly faster, this should not be a concern. Use whichever makes sense for the context here. Since you don't stick null values into the array, I prefer the isset() form because the syntax reads better to me. Peace, David
