我需要根据给定的学科,从以下数组中打印出学生的姓名和成绩:
$marks = [
"john" => ["physics" => 30, "maths" => 55, "chemistry" => 66],
"jack" => ["physics" => 44, "maths" => 19, "chemistry" => 87],
"mark" => ["physics" => 77, "maths" => 66, "chemistry" => 67],
];
我知道如果执行 echo $marks['john']['chemistry'];
会打印学生/科目的成绩,但是如何使用 foreach 循环来显示化学成绩的所有学生和其分数呢?