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Variable to be checked
Not: 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) |
Exempel 1. A simple empty() / isset() comparison.
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Not: Eftersom detta �r en s� kallad language construct och inte en funktion kan den inte anropas med hj�lp av variabla funktioner
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doubleval | Upp | floatval |