usage: 
php tree-display.php <tree deepth>

$ php tree-display.php 3
 name-00000001[1]
┇    ┠ name-00000002[2]
┇    ┇    ┠ name-00000003[3]
┇    ┇    ┠ name-00000004[4]
┇    ┇    ┗ name-00000005[5]
┇    ┠ name-00000006[6]
┇    ┇    ┠ name-00000007[7]
┇    ┇    ┠ name-00000008[8]
┇    ┇    ┗ name-00000009[9]
┇    ┗ name-00000010[10]
┇         ┠ name-00000011[11]
┇         ┠ name-00000012[12]
┇         ┗ name-00000013[13]
┠ name-00000014[14]
┇    ┠ name-00000015[15]
┇    ┇    ┠ name-00000016[16]
┇    ┇    ┠ name-00000017[17]
┇    ┇    ┗ name-00000018[18]
┇    ┠ name-00000019[19]
┇    ┇    ┠ name-00000020[20]
┇    ┇    ┠ name-00000021[21]
┇    ┇    ┗ name-00000022[22]
┇    ┗ name-00000023[23]
┇         ┠ name-00000024[24]
┇         ┠ name-00000025[25]
┇         ┗ name-00000026[26]
┗ name-00000027[27]
     ┠ name-00000028[28]
     ┇    ┠ name-00000029[29]
     ┇    ┠ name-00000030[30]
     ┇    ┗ name-00000031[31]
     ┠ name-00000032[32]
     ┇    ┠ name-00000033[33]
     ┇    ┠ name-00000034[34]
     ┇    ┗ name-00000035[35]
     ┗ name-00000036[36]
          ┠ name-00000037[37]
          ┠ name-00000038[38]
          ┗ name-00000039[39]


resource usage[level: 3, node number: 39]: 
        clock time: 0.001967s
        system cpu: 0.000169s
          user cpu: 0.001013s
      memory usage: 7208 byte

<?php
/**
 * 无限级(受尾节点描述算法限制, 详见tree_parse注释)递归菜单
 * author: selfimpr
 * blog: http://blog.csdn.net/lgg201
 * mail: lgg860911@yahoo.com.cn
 */

define('MAX_NODES',            3);                        /* 最大子节点数 */
define('MAX_NODE_INDEX',    MAX_NODES - 1);            /* 子节点最大索引值 */
define('NAME_FMT',            'name-%08d');                /* 节点内容输出格式串 */

/* 树节点数据结构 */
define('K_ID',                'id');
define('K_NAME',            'name');
define('K_CHILD',            'children');

/* 输出构造时使用的拼装字符 */
define('PREFIX_TOP',        '┏');                    /* 第一层第一个节点的标识符 */
define('PREFIX_BOTTOM',        '┗');                    /* 每一个父节点的最后一个子节点的标识符 */
define('PREFIX_MIDDLE',        '┠');                    /* 所有非上面两种情况的节点的标识符 */
define('PREFIX_LINE',        '┇');                    /* 祖先节点的连线符 */
define('SPACE',                ' ');                    /* 空白占位(所有尾节点不显示连线符) */
define('WIDE_SPACE',        str_repeat(SPACE, 4));    /* 宽的空白占位, 为了让树的层次清晰 */


/**
 * data_build 
 * 构造一个节点
 * @param mixed $id         节点id
 * @param mixed $is_leaf     是否叶子
 * @access public
 * @return void
 */
function node_build($id, $is_leaf = FALSE) {
    return array(
        K_ID    => $id, 
        K_NAME    => sprintf(NAME_FMT, $id), 
        K_CHILD    => $is_leaf ? NULL : array(), 
    );
}
/**
 * tree_build 
 * 构造一棵树(树中每个节点的子节点数由MAX_NODES确定)
 * @param mixed $datas     要返回的树引用
 * @param mixed $id     起始ID
 * @param mixed $level     树的层级
 * @access public
 * @return void
 */
function tree_build(&$datas, &$id, $level) {
    if ( $level < 1 ) return ;
    $is_leaf    = $level == 1;
    $i            = -1;
    $next_level    = $level - 1;
    while ( ++ $i < MAX_NODES ) {
        $data    = node_build($id ++, $is_leaf);
        if ( !$is_leaf ) 
            tree_build($data[K_CHILD], $id, $next_level);
        array_push($datas, $data);
    }
}

/**
 * node_str 
 * 输出一个节点自身的信息
 * @param mixed $string 返回结果的字符串(引用传值)
 * @param mixed $data     节点数据
 * @access public
 * @return void
 */
function node_str(&$string, $data) {
    $string    .= sprintf(' %s[%