--
-- 表的结构 `tp_likecate`
--

CREATE TABLE IF NOT EXISTS `tp_likecate` (
 `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
 `catename` varchar(24) NOT NULL,
 `path` varchar(10) NOT NULL,
 `fullpath` varchar(20) NOT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=9 ;

--
-- 转存表中的数据 `tp_likecate`
--

INSERT INTO `tp_likecate` (`id`, `catename`, `path`, `fullpath`) VALUES
(1, '手机', '', ',1'),
(2, '功能手机', '1', '1,2'),
(3, '老人手机', '1,2', '1，2，3'),
(4, '儿童手机', '1,2', '1,2,4'),
(5, '智能手机', '1', '1,5'),
(6, 'android手机', '1,5', '1,5,6'),
(7, 'IOS手机', '1,5', '1,5,7'),
(8, 'WinPhoto手机', '1,5', '1,5,8');

<"htmlcode">

function likecate($path='') {
  // concat() 连接字段
  $sql = "select id,catename,path, concat(path,',',id) as fullpath from tp_likecate order by fullpath asc";
  $res = mysql_query($sql);
  $result = array();
  while($row=mysql_fetch_assoc($res)) {
    $deep = count(explode(',', trim($row['fullpath'], ','))); // explode字符串转换为数组 implode数组转换为字符串
    $row['catename'] = @str_repeat('&nbsp;&nbsp;', $deep).'|--'.$row['catename'];
    $result[] = $row;
  }
  return $result;
}



输出：


// 简单输出
$res = likecate();

echo "<select name='cate'>";
foreach($res as $key=>$val) {
  echo "<option>{$val['catename']}</option>";
}
echo "</select>";
echo "<br />";

// 封装方法
function getPathCate($cateid) {
  $sql = "select *,concat(path, ',',id) fullpath from tp_likecate where id = $cateid";
  $res = mysql_query($sql);
  $row = mysql_fetch_assoc($res);
  $ids = $row['fullpath'];
  $sql = "select * from tp_likecate where id in($ids) order by id asc";
  $res = mysql_query($sql);
  $result = array();
  while($row = mysql_fetch_assoc($res)) {
    $result[] = $row;
  }
  return $result;
}

// 加上了链接的参数
function displayCatePath($cateid,$link='cate.php"<a href='{$link}{$v['id']}'>{$v['catename']}</a> > ";
  }
  return $str;
}
echo displayCatePath(4);



效果： 



以上就是php实现面包屑导航的详细步骤，希望对大家学习php程序设计有所帮助。