PHP Arrays
Which function will return true if a variable is an array or false if it is not?

do_array()
this_array()
in_array()
is_array()

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PHP Arrays
What will be the output of the following PHP code?
$arr = array ("picture1.JPG", "picture2.jpg", "Picture10.jpg", "picture20.jpg");
sort($arr);
print_r($arr);

Array ( [0] => Picture10.jpg [1] => picture1.JPG [2] => picture2.jpg [3] => picture20.jpg )
Array ( [0] => picture1.JPG [1] => Picture10.jpg [2] => picture2.jpg [3] => picture20.jpg )
Array ( [0] => picture1.JPG [1] => picture2.jpg [2] => Picture10.jpg [3] => picture20.jpg )
Array ( [0] => Picture10.jpg [1] => picture1.JPG [2] => picture20.jpg [3] => picture2.jpg )

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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 ( [0] => red [1] => green [2] => blue [3] => yellow )
Array ( [a] => blue [b] => yellow [c] => red [d] => green )
Array ( [a] => red [b] => green [c] => blue [d] => yellow )
Array ( [0] => blue [1] => yellow [2] => red [3] => green )

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PHP Arrays
What will be the output of the following PHP code ?
$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);

Array ( [e] => red [f] => green [g] => blue )
Array ( [a] => red [b] => green [c] => blue [d] => yellow )
Array ( [a] => red [b] => green [c] => blue [d] => yellow [e] => red [f] => green [g] => blue )
Array ( [a] => red [b] => green [c] => blue )

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