thinkphp 无线级别分类
name id parent_id path
新闻 1 0 0
中国新闻 2 1 0-1
河北新闻 3 2 0-1-2
保定新闻 0-1-2-3
美国新闻 4 1 0-1
纽约新闻 5 4 0-1-4
华尔街新闻6 5 0-1-4-5
俄罗斯新闻 7 1 0-1
数据库字段
mysql> select * from news;
+---------+-----------+------+---------+
| news_id | news_name | pid | path |
+---------+-----------+------+---------+
| 1 | 新闻 | 0 | 0 |
| 2 | 中国新闻 | 1 | 0-1 |
| 3 | 美国新闻 | 1 | 0-1 |
| 4 | 河北新闻 | 2 | 0-1-2 |
| 5 | 纽约新闻 | 3 | 0-1-3 |
| 6 | 邯郸新闻 | 4 | 0-1-2-4 |
+---------+-----------+------+---------+
6 rows in set (0.00 sec)
以无线级别的思想查看数据库
mysql> select news_id,news_name,pid,path,concat(path,'-',news_id) as bpath from
news order by bpath;
+---------+-----------+------+---------+-----------+
| news_id | news_name | pid | path | bpath |
+---------+-----------+------+---------+-----------+
| 1 | 新闻 | 0 | 0 | 0-1 |
| 2 | 中国新闻 | 1 | 0-1 | 0-1-2 |
| 4 | 河北新闻 | 2 | 0-1-2 | 0-1-2-4 |
| 6 | 邯郸新闻 | 4 | 0-1-2-4 | 0-1-2-4-6 |
| 3 | 美国新闻 | 1 | 0-1 | 0-1-3 |
| 5 | 纽约新闻 | 3 | 0-1-3 | 0-1-3-5 |
+---------+-----------+------+---------+-----------+
6 rows in set (0.04 sec)
News_id 自增
Pid :当前的pid是,父级news_id,
Path:当前的path是父级的path连上父级的news_id
bPath:当前的bpath是当前的path字段加上当前的news_id字段,他是一个临时的字段,这样就可以排序bpath,就可以达到一级一级的浏览的效果
concat()函数的参数是字符串列表,返回结果是 链接参数产生的字符串
在TP框架中
CategoryAction.class.php
class CategoryAction extends Action{
public function shows(){
header('Content-Type:text/html;charset=utf8');
$model=D('News');
$list=$model->field("news_id,news_name,pid,path,concat(path,'-',news_id) as bpath")->order('bpath')->select();//bPath字段是path字段加上news_id字段
//var_dump($list);
/*php中的foreach,添加count子段,在bpath字段中,新闻是2个数字(0,1),中国新闻是3个{0,1,2},美国新闻是3个{0,1,3},河北新闻是4个数字(0,1,2,4)...所以要把-横杠去掉计算bpath的个数,用explode把bpath的字符串分割成数组,在计算数字的长度,值就是count字段的内容,缩进的字符数*/
foreach($list as $key=>$value){
//没循环一次就增加一个count字段,值是由字符串分割数组的个数
$list[$key]['count']=count(explode('-',$value['bpath']));//$list[$key]['count']添加一个临时count字段
}
$this->assign('list',$list);
$this->display();
}
public function add(){
$model=D('News');
$data=array(
'news_name'=>$_POST['uname'],
'pid'=>$_POST['pid'],//新添加的父id应该是点击当前option的id,也就是value="{$vo.news_id}",获得表单
?>
模板中show.html

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PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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