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我需要打印的學生姓名,然後從以下陣列針對特定的主題標誌:如何使用PHP在foreach循環中獲取多維數組的鍵?
$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'];
它將打印標記爲學生/主題,但我應該怎麼接近foreach循環顯示所有學生及其化學成績?