Alright, take this for example:\[code\]$array['key'] = 'value';$SQL = "SELECT column FROM table WHERE column='{$array[key]}'";\[/code\]That's how I've been doing it, but of course if I were to enable E_ALL error reporting, I'd get a notice about using the undeclared constant, and it would assume 'key' instead of a constant.As such, I assume that's not the proper or more efficient way to do it, so what would be the most efficient way of doing that SQL query (or other relevant string)?