var
Variable to be checked
Bemærk: empty() only checks variables as anything else will result in a parse error. In other words, the following will not work: empty(trim($name)).
empty() is the opposite of
(boolean) var
,
except that no warning is generated when the variable is not set.
Returns FALSE if var
has a non-empty
and non-zero value.
The following things are considered to be empty:
"" (an empty string) |
0 (0 as an integer) |
"0" (0 as a string) |
NULL |
FALSE |
array() (an empty array) |
var $var; (a variable declared, but without a value in a class) |
Eksempel 1. A simple empty() / isset() comparison.
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Bemærk: Fordi dette er en indbygget sprogfunktion og ikke en funktion, kan den ikke blive kaldt vha. variable funktioner