PHP - Get key name of array value
Solution 1:
If you have a value and want to find the key, use array_search() like this:
$arr = array ('first' => 'a', 'second' => 'b', );
$key = array_search ('a', $arr);
$key will now contain the key for value 'a' (that is, 'first').
Solution 2:
key($arr);
will return the key value for the current array element
http://uk.php.net/manual/en/function.key.php