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", "h" => "orange");
$a3 = array("i" => "orange");
$a4 = array_combine($a2, $a3);
$result = array_diff($a4, $a2);
print_r($result);

Array ( [i] => orange )
Array ( [d] => yellow )
Array ( [d] => yellow [h] => orange )
Array ( [h] => orange )

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PHP Arrays
What will be the output of the following PHP code ?
$array = array("red", "green");
array_push($array, "blue", "yellow");
print_r($array);

Array ( [0] => blue [1] => yellow [2] => red [3] => green )
Array ( [0] => blue [1] => yellow )
Array ( [0] => red [1] => green [2] => blue [3] => yellow )
Array ( [0] => red [1] => 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");
$result = array_flip($a1);
print_r($result);

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

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PHP Arrays
There are three different kind of arrays:

Numeric array, String array, Multidimensional array
Const array, Associative array, Multidimensional array
Numeric array, Associative array, Dimensional array
Numeric array, Associative array, Multidimensional array

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