ZEND MOCK TEST :intersect function list in php 5

there are various kind of intersection functions in php. they are the followings----

array_intersect(array arr1,array arr2,...): it will return the values of arr1 that are in other arrays.
array_intersect_assoc: it will return the values of arr1 with index checking with other arrays.
array_intersect_key: computes comparisons using keys.
array_intersect_uassoc: computes comparisons using association but checking keys by a user function.
array_uintersect_assoc: computes comparisons using association but checking values by a user function.
array_intersect_ukey: computes comparisons using keys.
array_uintersect: computes comparisons using values by a user function.
array_uintersect_uassoc: computes comparisons using association but checking keys and values by a user function.

Question: The following code snippet displays what for the resultant array?

0, 3 => 2, 4 => 6);
$b = array(3 => 1, 4 => 3, 6 => 4);

print_r(array_intersect($a, $b));
?>

Answer:

1. 1 => 0
2. 1 => 3, 3 => 1, 4 => 3
3. 3 => 1, 3=> 2, 4 => 3, 4=> 6
4. 1 => 0, 3 => 2, 4 => 6
5. An empty Array
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