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PHP recursion, static variables, anonymous function use

巴扎黑Original: 2016-11-10 14:04:351125browse

Recursively read task list code

<!doctype html>  
<html lang="en">  
<head>  
    <meta charset="utf-8">  
    <title>Current To-Do List</title>  
</head>  
<body>  
<?php  
    function make_list($parent) {  
        global $tasks;  
        echo &#39;<ol>&#39;;  
  
        foreach($parent as $task_id => $todo) {  
            echo "<li>$todo";  
  
            if (isset($tasks[$task_id])) { // 如果当前id有子任务则递归创建菜单  
                make_list($tasks[$task_id]);  
            }  
  
            echo "</li>";  
        }  
  
        echo &#39;</ol>&#39;;  
    }  
  
    $db = mysqli_connect(&#39;192.168.31.172&#39; ,&#39;root&#39;, &#39;root&#39;, &#39;phpadvanced&#39;);  
    mysqli_query($db, "set names utf8");  
    $q = &#39;SELECT task_id, parent_id, task FROM tasks WHERE date_completed="0000-00-00 00:00:00" ORDER BY parent_id, date_added ASC&#39;;  
    $r = mysqli_query($db, $q);  
  
    $tasks = array();  
while (list($task_id, $parent_id, $task) = mysqli_fetch_array($r, MYSQLI_NUM)) {  
    $tasks[$parent_id][$task_id] = $task;  
}  
//echo &#39;<pre class="brush:php;toolbar:false">&#39;.print_r($tasks,1).&#39;

'; make_list($tasks[0]); //Send it the array containing the top tasks, the top parent_id is 0 ?>

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