Foreach variable that equals a value

Foreach variable that equals a value

I'm trying to display results in a foreach loop.
I have an array like so:
$slides = array(
1 => $params->get('param_1'),
2 => $params->get('param_2'),
3 => $params->get('param_3')
);
If a parameter in the backend is set to yes, the value equals 1, and thus
a result is displayed.
So what I'm trying to write is, foreach array value that is equal to 1
I'm aware that I can't use something like this:
foreach (slides == 1) {
// echo stuff here
}
How would I write this foreach loop? Any help or guidelines would be
highly appreciated