PHP Arrays
What will be the output of the following PHP code? $a1 = array("red", "green"); $a2 = array("blue", "yellow"); $a3 = array_merge($a1, $a2); $a4 = array("a", "b", "c", "d"); $a = array_combine($a4, $a3); print_r($a);
Array ( [a] => red [b] => green [c] => blue [d] => yellow )
Array ( [0] => blue [1] => yellow [2] => red [3] => green )
Array ( [a] => blue [b] => yellow [c] => red [d] => green )
Array ( [0] => red [1] => green [2] => blue [3] => yellow )