[ThePhenix]

You first need to check if the inputtext is a null string before comparing both strings. You could use this useful macro by ******:

PHP код:

#if !defined isnull
    #define isnull(%1)                     ((!(%1[0])) || (((%1[0]) == '\1') && (!(%1[1]))))
#endif 


PHP код:

if(isnull(inputtext))
    {
        //Do something: display a dialog saying no text was input
        return 0;
    }