Question

如果结构是：

parent A
  -child B
   - - child c
  ---child d
----child e

以下代码可以循环第一层（-child B）。如果我想将它们全部循环出去，我该怎么做？

foreach ($childCatID as $kid)
{
    $childCatName = $wpdb->get_row("SELECT name FROM $wpdb->terms WHERE term_id=$kid");
    echo $childCatName->name;
}

如果父A中所有孩子的图层是第四深度，如何将它们循环出去？如果父A中所有孩子的层都不知道，有没有办法将它们循环出去？

我尝试使用以下代码，但没有将它们循环出来。

foreach ($childCatID as $kidone)
  foreach ($kidone as $kidtwo){
    foreach ($kidtwo as $kidthree){
      foreach ( $kidthree as $kid){
        $childCatName = $wpdb->get_row("SELECT name FROM $wpdb->terms WHERE term_id=$kid");
        echo $childCatName->name;
      }
    }
}

Answer 1

您应该将foreach循环打包到函数中，并以递归方式调用它

function EchoNode($node)
{
    if (is_array($node))
    {
        foreach ($node as $kid)
        {
            if (is_array($kid))
            {
                EchoNode($kid);
            }
            else
            {
                $childCatName = $wpdb->get_row("SELECT name FROM $wpdb->terms WHERE term_id=$kid");
                echo $childCatName->name;
            }
        }
    }
    else
    {
        $childCatName = $wpdb->get_row("SELECT name FROM $wpdb->terms WHERE term_id=$node");
        echo $childCatName->name;
    }
}

如何循环它们？

1 个答案: