What will be the output of the following PHP code?
<?php
$a1 = array(“red”, “green”);
$a2 = array(“blue”, “yellow”);
print_r(array_merge($a1, $a2));
?>
a) Array ( [0] => red [1] => green)
b) Array ( [0] => blue [1] => yellow [2] => red [3] => green )
c) Array ( [0] => red [1] => green [2] => blue [3] => yellow )
d) Array ( [0] => blue [1] => yellow )

Answer: c
Explanation: The array_merge() function merges one or more arrays into one array.