ZCE Zend Certified Engineer Define problem

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define('FOO', 10);

$array = array(10 => FOO,
               "FOO" => 20);

print $array[$array[FOO]] * $array["FOO"];

Answer: $array[FOO] will be replaced by $array[10].

The value of $array[10] is again FOO ie 10

therefore $array[$array[FOO]] = 10