name_grade[Mike][Exam1] = 90, name_grade[Mike][Exam2] = 95,

name_grade[Adam][Exam1] = 80, name_grade[Adam][Exam2] = 87,

name_grade[John][Exam1] = 96, name_grade[John][Exam2] = 98,

Array ( [Mike] => Array ( [Exam1] => 90 [Exam2] => 95 ) [Adam] => Array ( [Exam1] => 80 [Exam2] => 87 ) [John] => Array ( [Exam1] => 96 [Exam2] => 98 ) )