What is the method of classification in PHP Infinitus
What I bring to you today is PHP’s Infinitus classification technology. I divide Infinitus classification into two types. The specific method is as follows:
First of all, I will show you the database table. The database is tasks, and the database table is also tasks.
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The first method (array method)
This method actually queries all the data first, focusing on the generated two-dimensional array.
<?php //分类方法 function make_list($parent,$deep = 0){ global $tasks;//申明全局变量 global $strArr;//申明全局变量 $qianzhui = str_repeat(" ",$deep)."|--"; foreach ($parent as $key => $value) { $strArr[] = $qianzhui.$value; if(isset($tasks[$key])){ make_list($tasks[$key],++$deep);//递归调用函数 } } } //数据库连接 $dbc = mysqli_connect("localhost","root","1234","tasks"); //拼接sql语句 $q = "select task_id,parent_id,task from tasks where date_completed = '0000-00-00:00:00:00' order by parent_id, date_added asc"; //执行sql $r = mysqli_query($dbc,$q); //遍历结果集 while (list($task_id,$parent_id,$task) = mysqli_fetch_array($r,MYSQLI_NUM)) { //组成数组(一级键为parent_id,二级键为task_id,值为任务内容) $tasks[$parent_id][$task_id] = $task; } //打印数组 echo "<pre class="brush:php;toolbar:false">"; print_r($tasks); echo ""; make_list($tasks[0]); echo "
"; //打印缩进数组 print_r($strArr); echo ""; ?>
The second method (lookup table method)
This method actually only queries parent_id= at the beginning. 0, and then use a recursive method to dynamically generate query conditions, and then use the task_id of each record as task_id, and then conduct a new round of query until the query result is empty.
<?php function findArr($where = "parent_id = 0",$deep = 0){ $dbc = mysqli_connect("localhost","root","1234","tasks"); global $strArr; $q = "select task_id,parent_id,task from tasks where ".$where." order by parent_id,date_added asc"; $r = mysqli_query($dbc,$q); $qianzhui = str_repeat(" ", $deep)."|--"; while (list($task_id,$parent_id,$task) = mysqli_fetch_array($r,MYSQLI_NUM)) { $strArr[] = $qianzhui.$task; //拼接查询条件 $where = "parent_id = ".$task_id; //递归查询 findArr($where,++$deep); } } findArr(); //打印缩进数组 echo "<pre class="brush:php;toolbar:false">"; print_r($strArr); echo ""; ?>
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