如何在PHP中迭代多维数组？

Question

I have that data structure into my array $categories

stdClass Object
(
    [37] => Array
        (
            [term_id] => 37
            [name] => Files 
            [parent] => 0
            [38] => Array
                (
                    [term_id] => 38
                    [name] => Downloads 
                    [parent] => 37
                )

        )

    [29] => Array
        (
            [term_id] => 29
            [name] => Articles 
            [parent] => 0
            [36] => Array
                (
                    [term_id] => 36
                    [name] => General
                    [parent] => 29
                )

            [35] => Array
                (
                    [term_id] => 35
                    [name] => WordPress 
                    [parent] => 29
                )

            [34] => Array
                (
                    [term_id] => 34
                    [name] => Php, Sql 
                    [parent] => 29
                )

        )

    [1] => Array
        (
            [term_id] => 1
            [name] => Uncategorized
            [parent] => 0
        )

)

Now what I like to do is print that data in the following form with indents.

Files
    Downloads
Articles
    General
    WordPress
    Php, Sql
Uncategorized

To achive the above result I use that code

$categories = get_array_content(); // Return the above data

print_category_tree($categories);

function print_category_tree(&$c)
{
    foreach($c as $cat)
    {
        ?>
        <label>
            <input type="checkbox" value="<?php echo $cat['term_id']; ?>" /> <?php echo $cat['name']; ?>
        </label>
        <br />
        <?php

        foreach($cat as $categ)
        {
            if(is_array($categ))
            {
                print_category_tree($categ);
            }
        }
    }
}

I know that something is wrong with that but I can't guess what. Can somebody please help me with multi dimentional array iteration ?

Answer 1

使用http://www.php.net/manual/en/class.recursivearrayiterator.php

Answer 2

You call the function with two params:

print_category_tree($categ, $forum_id);

But your function takes only one param:

function print_category_tree(&$c)

And you are using the & in the function. You might want to test it without.

function print_category_tree($c)