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我需要打印的学生姓名,然后从以下阵列针对特定的主题标志:如何使用PHP在foreach循环中获取多维数组的键?
$marks = [
"john" => ["physics" => 30, "maths" => 55, "chemistry" => 66],
"jack" => ["physics" => 44, "maths" => 19, "chemistry" => 87],
"mark" => ["physics" => 77, "maths" => 66, "chemistry" => 67],
];
我明白,如果我做echo $marks['john']['chemistry'];
它将打印标记为学生/主题,但我应该怎么接近foreach循环显示所有学生及其化学成绩?