Question

Say I assign the following fruits:

array ('1' => 'apple', '2' => 'banana', '4' => 'grape', '8' => 'orange')

If I wanted to represent apple and banana, I could just do the following: 0001 OR 0010 to get 0011 (or 3), right?

Given the number 3, how do I convert that to 1 and 2?

Answer 1

All keys will be loaded into $keys:

$keys = array();
$value = 3;

foreach ($arr as $key => $val)
{
   if ($value & $key)
   {
      $keys[] = $key;
   }
}