在PHP中从类别循环到子类别

Question

我们的结构与您在下面的屏幕截图中看到的方式类似：

https://github.com/petabridge/akkadotnet-code-samples]

我们的数据库结构如下所示：

这里的数据库表“PID”是父ID，其中0 =父ID。休息PID是同一个id的父ID。

现在我们试图获得“Brand”或“Footware”的所有子类别，因此它应该显示该树下的所有子类别和子子类别细节。这可以通过PHP完成吗？任何循环或任何方式？

谢谢！

Answer 1

试试这个

function fetchCategoryTreeList($parent = 0, $user_tree_array = '') {
global $con;
if (!is_array($user_tree_array))
$user_tree_array = array();

$sql = "SELECT * FROM `location` WHERE 1 AND `parent_id` = $parent ORDER BY id ASC";
$result=$con->query($sql);

if (mysqli_num_rows($result) > 0)
{
 $user_tree_array[] = "<ul>";
 while ($row =$result->fetch_object())
 {
  $user_tree_array[] = "<li>". $row->name."</li>";
      $user_tree_array = fetchCategoryTreeList($row->id, $user_tree_array);
 }
 $user_tree_array[] = "</ul><br/>";
}
  return $user_tree_array;
}

这里的呼叫功能

$res = fetchCategoryTreeList();
foreach ($res as $r)
{
   echo  $r;
}

Answer 2

试试这样：

<?php
//connect to mysql and select db
$conn = mysqli_connect('localhost', 'rootuser', 'rootpwd','dbname');

if( !empty($conn->connect_errno)) die("Error " . mysqli_error($conn));

//call the recursive function to print category listing
category_tree(0);

//Recursive php function
function category_tree($catid){
global $conn;

$sql = "select * from category where pid ='".$catid."'";
$result = $conn->query($sql);

while($row = mysqli_fetch_object($result)):
$i = 0;
if ($i == 0) echo '<ul>';
 echo '<li>' . $row->category;
 category_tree($row->id);
 echo '</li>';
$i++;
 if ($i > 0) echo '</ul>';
endwhile;
}
//close the connection
mysqli_close($conn);
?>

希望这会有所帮助。

Answer 3

  

我在我的项目中使用了这个函数，它是一个递归函数。

     

/ ****获取所有类别功能******* /

 function categoryChild($id, $spacing = '') {
            $s = "SELECT * FROM category WHERE parent_cat_id = $id ";

            $r = mysql_query($s);

            $children = array();

            if(mysql_num_rows($r) > 0) {

                while($row = mysql_fetch_array($r)) {

                    $children[$row['category_id']]['category_name'] = $spacing.$row['category_name'];
                    $children[$row['category_id']]['id'] = $row['category_id'];
                    $children[$row['category_id']]['child'] = categoryChild($row['category_id'], $spacing . '    ');
                }
            }

            return $children;
        }


>   /************ GET ALL CATEGORIES FUNCTION****************/
$allcategory =   categoryChild(0);

print_r($allcategory);