class1 array john 100 james 85 class2 micky 78 45 classscores..., PHP Arrays, PHP

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Question:$class1 = array("John" => 100, "James" => 85);
$class2 = array("Micky" => 78, "John" => 45);
$classScores = array_merge_recursive($class1, $class2);
print_r($classScores); 
This returns the following:

A Array ( [John] => Array ( [0] => 100 [1] => 45 ) [James] => 85 [Micky] => 78 ) 
B Array ([1] => 45 ) [James] [John] => Array ( [0] => 100 => 85 [Micky] => 78 ) 
C Array ( [James] => 85 [Micky] => 78 [John] => Array ( [0] => 100 [1] => 45 ) ) 
D Array ([1] => 45 ) [James] => 85 [Micky] => 78[John] => Array ( [0] => 100 )

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Question:$class1 = array("John" => 100, "James" => 85); $class2 = array("Micky" => 78, "John" => 45); $classScores = array_merge_recursive($class1, $class2); print_r($classScores); This returns the following:

A Array ( [John] => Array ( [0] => 100 [1] => 45 ) [James] => 85 [Micky] => 78 )

B Array ([1] => 45 ) [James] [John] => Array ( [0] => 100 => 85 [Micky] => 78 )

C Array ( [James] => 85 [Micky] => 78 [John] => Array ( [0] => 100 [1] => 45 ) )

D Array ([1] => 45 ) [James] => 85 [Micky] => 78[John] => Array ( [0] => 100 )

A