int empty(mixed var);Returns false if var is set and has a non-empty or non-zero value; true otherwise.
1
2 $var = 0;
3 if (empty($var)) { #evaluates true
4 print '$var is either 0 or not at all set';
5 }
6 if (!isset($var)) { // evaluates false
7 print 'The $var is not set at all';
8 }
9 |
Note that this is meaningless when used on anything which isn't a variable; i.e. empty (addslashes ($name)) has no meaning since it would be checking whether something which isn't a variable is a variable with a false value.