用于标记谁买了几本共计多少钱的书

张三同学买了1本书价格是54.9，李四同学买了3本书45.8 36.5 50.2，王五同学买了5本书21.3 45.6 39.5 62.5 20.5
赵六同学买了8本书 50.6 20.4 36.7 45.6 19.8 60.5 44.3 55.0,
丁七同学买了10本书47.8 30.6 15.6 56.8 30.0 29.8 60.8 70.9 69.9 116.7请构造一个数组，用于标记谁买了几本共计多少钱的书

题主要的代码如下，有帮助麻烦点个采纳【本回答右上角】，谢谢~~有其他问题可以继续交流~

 <?php
$books=array("张三"=>array(54.9),
"李四"=>array(45.8,36.5,50.2),
"王五"=>array(21.3,45.6,39.5,62.5,20.5),
"赵六"=>array(50.6,20.4,36.7,45.6,19.8,60.5,44.3,55.0),
"丁七"=>array(47.8,30.6,15.6,56.8,30.0,29.8,60.8,70.9,69.9,116.7)
);
foreach($books as $key=>$value){
  echo $key."购买了".count($value)."本书，总价：".array_sum($value)."<br>";
}
?>