<strong> Option Array: </strong> <?php
$my_arr = get_custom_field('product_options');
$opts = array(
    'Option 1' => '<div>Option 1 description</div>',
    'Option 2' => '<div>Option 2 description</div>',
    'Option 3' => '<div>Option 3 description</div>',
);
 
foreach($opts as $k=>$v) {
 //if (in_array($my_arr[$k],$opts)!==TRUE)  echo $v; else echo 'nope'; 
if (in_array($my_arr[$v], array_keys($opts)) !== TRUE) echo $v; else echo 'nope';
}
    ?>