Can interact
This function returns true if the logged-in character is subject to neither the Hardcore or Ronin restrictions on inter-player interactions. If the character has not spent the requisite turns and/or has not freed the King (for Hardcore characters), the function returns false.
An example:
if(can_interact()) {
buy(3,$item[hot hi mein]);
} else {
adventure(10,$location[Knob Goblin Kitchens]);
}