21.
What will be the output of the following PHP code ?
<?php
$a1 = array("a" => "red", "b" => "green", "c" => "blue", "d" => "yellow");
$a2 = array("e" => "red","f" => "green", "g" => "blue");
$result = array_intersect($a1, $a2);
print_r($result);
?>

22.
What will be the output of the following PHP code ?
<?php
$a = array(12, 5, 2);
echo(array_product($a));
?>

23.
What will be the output of the following PHP code ?
<?php
$a = array("a" => "Jaguar", "b" => "Land Rover", "c" => "Audi", "d" => "Maseratti");
echo array_search("Audi", $a);
?>

24.
What will be the output of the following PHP code ?
<?php
$city_west = array("NYC", "London");
$city_east = array("Mumbai", "Beijing");
print_r(array_replace($city_west, $city_east));
?>

25.
What will be the output of the following PHP code ?
<?php
$people = array("Peter", "Susan", "Edmund", "Lucy");
echo pos($people);
?>