php 无限级分类

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<?php$arr = array(    array(        'id' => 1,        'pid' => 0,        'name' => 'A'    ),    array(        'id' => 2,        'pid' => 0,        'name' => 'A'    ),    array(        'id' => 3,        'pid' => 1,        'name' => 'A'    ),    array(        'id' => 4,        'pid' => 0,        'name' => 'A'    ),    array(        'id' => 5,        'pid' => 4,        'name' => 'A'    ),    array(        'id' => 6,        'pid' => 5,        'name' => 'A'    ),);function list_to_tree($list, $pid = 0){    $res = array();    if (!empty($list)) {        foreach ($list as $k => &$v) {            if ($v['pid'] == $pid) {                $v['child'] = list_to_tree($list, $v['id']);                $res[] = $v;            }        }        unset($v);    }    return $res;}function getChildren($parent, $deep=0) {    foreach($parent as $row) {        $data[] = array("id"=>$row['id'], "name"=>$row['name'],"pid"=>$row['pid'],'deep'=>$deep);        if (!empty($row['child'])) {            $data = array_merge($data, getChildren($row['child'], $deep+1));        }    }    return $data;}$options = getChildren(list_to_tree($arr));?><select name="" id="">    <?php  foreach ($options as $row) { ?>        <option value="<?php echo $row['id'] ?>"><?php echo str_pad("",$row['deep']*3, "|----",STR_PAD_RIGHT); ?><?php echo $row['name']; ?></option>    <?php } ?></select>
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