Novice please give me some advice--how to traverse an array

Question

$arr=array(

'Teaching Department'=>array(

array('Li','18','Lady'),

array('Gao','20','Male'),

array('Zhang','21','Yaoren'),

),

'Propaganda Department'=>array(

array('Li','18','Lady'),

array('Gao','20' ,'Male'),

array('Zhang','21','Yaoren'),

),

'Finance Department'=>array (

  array('Li','18','Lady'),

  array('Gao','20','Male'),

array('Zhang','21','Yaoren'),

),

);

##

Answer 1

foreach ($arr as $key => $value) {

foreach ($value as $val) {

echo "Department:" .$key." Name: ".$val[0]." Age: ".$val[1]." Gender: ".$val[2]."<br>";

}

}

Answer 2

You can’t use key values ​​like that

Answer 3

1. This array syntax is no longer used, please use: [...]

2. ##It can be implemented using a double loop, you can use foreach (), you can also use for()