为啥好多网站域名解析带www指向不带www?

为啥好多网站域名解析带www指向不带www?这么做的好处是什么?比如:https://www.php.cn/指向https://php.cn是为什么?

From [PHPdiscussion group] 2017-02-28 11:33:21 0  3  2193

After the session is saved, how can I check the information about the variables and attribute values ​​in the session (what are the array subscripts), or where are the session files stored? What is TEMP used by teachers?

How to view the attribute information of user_info using session::set('user_info',$data); in $data and using t...

From [PHPdiscussion group] 2017-10-01 16:03:05 0  3  2191

如何获取http请求中的参数值？

From [PHPdiscussion group] 2017-03-16 17:27:51 0  1  2189

什么时候应该不用引号？什么时候用单引号？什么时候用双引号啊？

如题

From [PHPdiscussion group] 2016-12-24 14:34:36 0  2  2188

There is no response when clicking the login button.

I typed the code based on it. Why is there no error or any response when clicking the login button?

From [PHPdiscussion group] 2018-04-10 22:32:01 0  5  2187

php - Your Phalcon version isn't compatible with Developer Tools

ERROR: Your Phalcon version isn't compatible with Developer Tools, download the latest at: https://phalconphp....

From [PHPdiscussion group] 2017-06-23 09:11:49 0  2  2186

报错： [ErrorException] chdir(): No such file or directory (errno 2)

From [PHPdiscussion group] 2020-11-17 15:37:36 0  2  2185

When the computer starts up, a blue screen appears saying that it has encountered a problem and will restart, and then it says that it is preparing to automatically repair it, and it cannot start up. What should I do?

When you first start up, a blue screen is displayed, saying that the computer has encountered a problem and wi...

From [PHPdiscussion group] 2018-02-09 20:06:58 0  1  2182

js cannot be loaded

I imported all the layui files. The CSS works, but the jS file cannot be loaded. What's going on? I checked th...

From [PHPdiscussion group] 2019-06-13 13:00:24 0  5  2181

Where to start with self-study of PHP?

'>I don’t know where to start when teaching myself PHP? Let the great god tell me

From [PHPdiscussion group] 2021-03-21 15:22:05 0  4  2168

WeChat mini program payment failed to activate

The front-end of my mini program failed to directly activate the payment function: Return to me Please open th...

From [PHPdiscussion group] 2018-06-21 15:10:26 0  8  2166

An error occurs when running Imagick's readImage() method

The code is as follows: function pdf2png($pdf,$path,$page=-1) {​ If(!extension_loaded('imagick'))             ...

From [PHPdiscussion group] 2019-07-23 11:41:11 0  2  2161

I have stored the path of the image in the database, but how should I write the background code to display the image in the foreground? It is not an upload function, but a function of getting the image from the database and displaying it in the foreground.

I have stored the path of the image in the database, but how should I write the background code to display the...

From [PHPdiscussion group] 2018-05-01 12:32:43 0  3  2152

Personal Alipay uses H5 to enable payment

Personal Alipay uses H5 to initiate payment. Personal Alipay uses H5 to initiate payment. Instant payment is m...

From [PHPdiscussion group] 2019-07-16 13:43:30 0  1  2151

Data refresh display - how to display data in the database like flight information on a large screen at an airport

There are n pieces of data in the database (which may change in real time). Now I want to display 8 pieces of ...

From [PHPdiscussion group] 2018-06-14 10:07:14 0  6  2149