//example-1
$students_department = array(
'John' => "Computer Science",
'Peter' => "Science",
'Dan' => "History"
);
print '
'; print_r($students_department); print '
';
//example-2
$students_department['George'] = "Physics";
$students_department['Michael'] = "Maths";
$students_department['Donald'] = "Chemistry";
echo $students_department['George'].'
';
print '
'; print_r($students_department); print '
';