PHP多维对象属性从数组访问

Question

I have an object which contain other objects. I have an array that describes what is the attributes i need to access. The Array can change in size.

My question is how can i access the sub-object attributes using the array?

Code example:

$student = new Student();
$arr = ['Grades', 'Score'];
foreach.... {}

expected result:

$student->$arr[0]->$arr[1];

I need to iterate over the $arr and access the $student sub-object

Answer 1

Something like this:

$student = new Student();
$sub_object = $student;  // or use $student itself if you don't need it
$arr = ['Grades', 'Score'];
foreach ($arr as $v) {
    $sub_object = $sub_object->$v;
}
echo $sub_object;