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

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

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PHP Arrays
What will be the output of the following PHP code?
$a=array("A","Cat","Dog","A","Dog");
$b=array("A","A","Cat","A","Tiger");
$c=array_combine($a,$b);
print_r(array_count_values($c));

Array ( [A] => 6 [Cat] => 1 [Dog] => 2 [Tiger] => 1 )
Array ( [A] => 2 [Cat] => 2 [Dog] => 1 [Tiger] => 1 )
Array ( [A] => 5 [Cat] => 2 [Dog] => 2 [Tiger] => 1 )
Array ( [A] => 2 [Cat] => 1 [Dog] => 4 [Tiger] => 1 )

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PHP Arrays
What will be the output of the following PHP code ?
$age = array("Harry" => "21", "Ron" => "23","Malfoy" => "21");
array_change_key_case($age, CASE_UPPER);
array_pop($age);
print_r($age);

Array ( [Harry] => 21 [Ron] => 23 )
Array ( [HARRY] => 21 [RON] => 23 [MALFOY] => 21 )
Array ( [HARRY] => 21 [RON] => 23 )
Array ( [Harry] => 21 [Ron] => 23 [Malfoy] => 21 )

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