如何使用PHP在foreach循环中获取多维数组的键? [英] How to get key of multidimensional array in foreach loop using php?
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问题描述
我需要从给定主题的以下数组中打印学生姓名和分数:
I need to print the student name and the mark from the following array for a given subject:
$marks = [
"john" => ["physics" => 30, "maths" => 55, "chemistry" => 66],
"jack" => ["physics" => 44, "maths" => 19, "chemistry" => 87],
"mark" => ["physics" => 77, "maths" => 66, "chemistry" => 67],
];
我了解,如果我执行echo $marks['john']['chemistry'];
,它将为学生/受试者打印分数,但是我应该如何使用 foreach 循环来显示所有学生及其化学成绩?>
I understand that if I do echo $marks['john']['chemistry'];
it will print the mark for the student/subject, but how should I approach a foreach loop for displaying all students and their scores for chemistry?
推荐答案
在php中 foreach()
您可以像这样获取当前项目的密钥
In php foreach()
you can get key of current item like this
foreach ($array as $key=>$item){...}
也可以像底层代码一样使用
Also use it like bottom code
foreach ($marks as $name=>$scores){
echo $name .":". $scores["chemistry"];
}
在演示
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