PHP代码一直有效,直到我成为一个函数

发布时间：2020-12-13 21:42:03 所属栏目：PHP教程来源：网络整理

导读：我在这里有这个代码,它给了我正在寻找的结果,一个格式很好的值树. $todos = $this-db-get('todos'); //store the resulting records $tree = array(); //empty array for storage $result = $todos-result_array(); //store results as arrays foreach ($res

我在这里有这个代码,它给了我正在寻找的结果,一个格式很好的值树.

$todos = $this->db->get('todos'); //store the resulting records
    $tree = array();                  //empty array for storage
    $result = $todos->result_array(); //store results as arrays

    foreach ($result as $item){
        $id = $item['recordId'];
        $parent = $item['actionParent'];
        $tree[$id] = isset($tree[$id]) ? $item + $tree[$id] : $item;
        $tree[$parent]['_children'][] = &$tree[];
    }

    echo '<pre>';
    print_r($tree);
    echo '</pre>';

当我将foreach中的代码放入这样的函数中时,我得到一个空数组.我错过了什么？

function adj_tree($tree,$item){
        $id = $item['recordId'];
        $parent = $item['actionParent'];
        $tree[$id] = isset($tree[$id]) ? $item + $tree[$id] : $item;
        $tree[$parent]['_children'][] = &$tree[];
    }

    $todos = $this->db->get('todos'); //store the resulting records
    $tree = array();                  //empty array for storage
    $result = $todos->result_array(); //store results as arrays

    foreach ($result as $item){
        adj_tree($tree,$item);
    }

    echo '<pre>';
    print_r($tree);
    echo '</pre>';

解决方法

现在,该函数正在制作{$tree}的本地副本,对其进行编辑,然后在函数关闭时丢弃该副本.

您有两种选择：

1)返回{$tree}的本地副本并将其分配给全局副本.

function adj_tree($tree,$item){
    $id = $item['recordId'];
    $parent = $item['actionParent'];
    $tree[$id] = isset($tree[$id]) ? $item + $tree[$id] : $item;
    $tree[$parent]['_children'][] = &$tree[];
    return $tree;
}
//...
foreach ($result as $item){
    $tree = adj_tree($tree,$item);
}

2)通过引用传递数组并编辑函数内的全局版本.

function adj_tree(&$tree,$item){
    $id = $item['recordId'];
    $parent = $item['actionParent'];
    $tree[$id] = isset($tree[$id]) ? $item + $tree[$id] : $item;
    $tree[$parent]['_children'][] = &$tree[];
}

（编辑：李大同）

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