看不懂啊请给小弟我详细解释下

www.MyException.Cn，网友分享于：2014-06-30 浏览：3次

看不懂啊,请给我详细解释下.

foreach ($categories as $key => $value) {<br />    $upid = $value['upid'];<br />    $categories[$key]['level'] = 0;<br />    if ($upid && isset($categories[$upid])) {<br />	$categories[$upid]['children'][] = $key; // 这个三维数组是什么意思? 这个$key值是怎么赋予这个三维数组的/<br />	while ($upid && isset($categories[$upid])) {<br />	    $categories[$upid]['allnodes'][] = $key;<br />	    $categories[$upid]['count'] += $categories[$key]['count']; //这个又是怎计算的, ??<br />	    $categories[$key]['level'] += 1;<br />	    $categories[$key]['parent'][$upid] = $categories[$upid]['catname']; //这个,这个也不懂<br />	    $upid = $categories[$upid]['upid']; //这个也不懂.<br />	}<br />	$categories[$key]['parent'] = array_reverse($categories[$key]['parent'], true);<br />    }<br />    if ($categories[$key]['level'] == 0) {<br />	$rootcategories[] = $key;<br />    }<br />}<br />

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------解决思路----------------------
$categories[$upid]['children'][] = $key;

例如 $upid=1, $key=2;
$categories[$upid]['children'][] = $key;
等于
$categories[1]['children'] 是一个数组，然后$key作为插入到数组最后。
执行完后
$categories = array(
    1 => array(
        'children' => array(2)
    )
);

categories[$upid]['count'] += $categories[$key]['count'];
等于
categories[$upid]['count'] = categories[$upid]['count'] + $categories[$key]['count'];

$categories[$key]['parent'][$upid] = $categories[$upid]['catname'];
$upid = $categories[$upid]['upid'];
这两句都是直接赋值。

------解决思路----------------------
$categories[$upid]['children'][]  = xxx 表示在$categories[$upid]['children'] 数组插入一个新元素。
例如
$arr = array('key'=>array());

$arr['key'][] = 1;
$arr['key'][] = 2;
$arr['key'][] = 3;

执行后.
$arr = array(
    'key' => array(1,2,3)
);

$categories[$upid]['count'] = $categories[$upid]['count'] + $categories[$key]['count'];
categories[$upid]['count'] 與 $categories[$key]['count'] 是應該是兩個數值，所以可以相加。
你可以print_r($categories); 看看$categories裡面是什麼。

$categories[$key]['parent'][$upid] = $categories[$upid]['catname'];

這個可以簡單點
$key = 'a';
$upid = 'b';

$categories[$key]['parent'][$upid] = 1;
$categories[$upid]['catname'] = 2;
相當於
$categories['a']['parent']['b'] = 1;
$categories['b']['catname'] = 2;

執行
$categories[$key]['parent'][$upid] = $categories[$upid]['catname'];
相當於
$categories['a']['parent']['b'] = $categories['b']['catname'];

所以
$categories[$key]['parent'][$upid] = 2;

------解决思路----------------------
学编程，就不能怕动手在这段代码的前后分别 print_r($categories);一切净收眼底
------解决思路----------------------

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