PHP数组

<?php
$a=['app','book'];
$b=array('app','book'); //数组
$c=array('学生'=>['xiaoming','xiaowang'],'老师'=>['zhulaoshi','wanglaoshi']) ;//二维数组
$d=array('学生'=>array('xiaoming','xiaowang'),'老师'=>array('zhulaoshi','wanglaoshi')) ;
// print_r($a);
// print_r($b);
// print_r($c);
// print_r($d);
foreach($c as $k=>$val){
foreach ($val as $key => $value) {    //二维数组遍历
 echo $key;
 echo ",";
 echo $value;
 echo ",";
 echo "|";
 # code...
}
}
?>