How to implement batch change function in php

php method to implement the batch change function: first create a PHP sample file; then use the "public function refresh(){...}" method to implement the batch change function.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How does php realize the function of changing batches?

php realizes the change function

 public function refresh()
    {
    /*换一换功能实现
    查找前20条数据的id值   组成一维数组
    在一维数组中再进行随机得到10个键名   得到含有随机键名的一维数组
    循环遍历  得到含有随机id得数据   然后进行查找得到数据
    */
        //第一步：得到的首页显示六本默认图书
        $index_book = $this->Model_book->get_index_book2(20);
        $rand=array_rand($index_book,9);
        $book=array();
        foreach($rand as $k=>$v){
            $book[$k]=$index_book[$v];
        }
        if(count($book)>0){
            echo  json_encode($book);
        }else{
            echo '';
        }
    }

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