isNull (Check for NULL or undefined)
See also: isEmpty (Prüfung auf leer)
Checks if all passed values are NULL or undefined.
Syntax
$isNull(value1[,value2[,value3 ...]])
Parameter
All passed parameters are checked for NULL or undefined.
Return value
True if all passed parameters are NULL or undefined, otherwise false.
Example
|
Syntax |
Result |
|
$isNull($null) |
true |
|
$isNull({undefineddatafield} |
true |
|
$isNull() |
false (because of empty text) |