PHP Arrays
Array values are keyed by ______ values (called indexed arrays) or using ______ values (called associative arrays). Of course, these key methods can be combined as well.

String, Boolean
Integer, string
Positive number, negative number
Even number, string
Float, string

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

Array ( [0] => NYC [1] => London )
Array ( [0] => Mumbai [1] => Beijing )
Array ( [1] => NYC [0] => London )
Array ( [1] => Mumbai [0] => Beijing )

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PHP Arrays
What will be the output of the following PHP code?
$array1 = array ("KA", "LA", "CA", "MA", "TA");
$array2 = array ("KA", "IA", "CA", "GA", "TA");
$inter = array_intersect ($array1, $array2);
print_r ($inter);

Array ( [1] => IA [3] => GA )
Array ( [1] => LA [3] => MA )
Array ( [0] => KA [1] => LA [2] => CA [3] => MA [4] => TA [5] => IA [6] => GA )
Array ( [0] => KA [2] => CA [4] => TA )

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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 ( [a] => a [b] => b [c] => c [d] => d )
Array ( [red] => red [green] => green [blue] => blue [yellow] => yellow )
Array ( [red] => a [green] => b [blue] => c [yellow] => 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, Associative array, Dimensional array
Numeric array, String array, Multidimensional array
Numeric array, Associative array, Multidimensional array
Const array, Associative array, Multidimensional array

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