MYSQLI - GDZIE W tablicy

Każdy element wymaga cudzysłowów

$list = "'food', 'drink', 'cooking'";
$query = "SELECT * FROM table WHERE stuff IN ($list)";

Lub jeśli masz tablicę

$array = array("food","drink","cooking");
$query = "SELECT * FROM table WHERE stuff IN (".implode(',', $array).")";