state array delaware pennsylvania new jersey arrayflip printr this example returns..., PHP Arrays, PHP

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Question:$state = array("Delaware", "Pennsylvania", "New Jersey");
$state = array_flip($state);
print_r($state); 

This example returns the following:

A Array ( [Delaware] => 0 [Pennsylvania] => 1 [New Jersey] => 2 ) 
B Array (0 =>[Delaware] 1=>[Pennsylvania] 2 =>[New Jersey] ) 
C Array ( [Delaware] => 1 [Pennsylvania] => 2[New Jersey] => 3 ) 
D Array ( [Delaware] => 0 [Pennsylvania] => 1 [New Jersey] => 2 )

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Question:$state = array("Delaware", "Pennsylvania", "New Jersey"); $state = array_flip($state); print_r($state); This example returns the following:

A Array ( [Delaware] => 0 [Pennsylvania] => 1 [New Jersey] => 2 )

B Array (0 =>[Delaware] 1=>[Pennsylvania] 2 =>[New Jersey] )

C Array ( [Delaware] => 1 [Pennsylvania] => 2[New Jersey] => 3 )

D Array ( [Delaware] => 0 [Pennsylvania] => 1 [New Jersey] => 2 )

D