Is empty (checkbox not checked)?
Return true if this field is empty (no value or blank value), or false if it’s not empty.
Used by the 'required' check to see if the field is populated, and descending Inputfields may override this according to their own definition of 'empty'.
Usage
$bool = $inputfieldCheckbox->isEmpty();Return value
bool
InputfieldCheckbox methods and properties
API reference based on ProcessWire core version 3.0.236