PHP Manual
Prev |  | Next

# empty

empty -- determine whether a variable is set

## Description

`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.

See also isset() and unset().

Prev | Home | Next
doubleval | Up | gettype