I tried doing this:
PHP Code:
int var = 1;
if(
SizeOfArray(var)==-1)
    
Link->Item[I_SWORD1]; 
Worked just find, except that it traced an error message in allegro.log saying that it tried to pass the value of var as an index into the array; returns -1 regardless of what number you put in as it should since it's not an array.