The difference between join tostring is the delimiter?

The difference between join tostring is the delimiter?

杨文亮 2019-03-26 11:52:24 0  0  1196

java - Whether users from different regions are divided into tables and groups in the database

For example, for takeout products, in order to facilitate the allocation of user orders to deliverymen, users in the same area will be grouped in the database. If they are grouped, there will be many areas and many groups.

PHP中文网 2017-05-24 11:33:15 0  1  644

string - Python string case-insensitive replacement

Replace hello in Hello World, HELLO PYTHON with My. Since the replace() function replacement is case-sensitive, how can Python implement string replacement without case sensitivity?

伊谢尔伦 2017-06-28 09:24:52 0  2  1587

Is NULL☞ here case-sensitive?

Is NULL☞ here case-sensitive?

没有输入昵称，请重新填写 2018-03-20 09:38:55 0  1  1489

How to distinguish Simplified Chinese, Traditional Chinese, Japanese, Korean in php

How does php distinguish between Simplified Chinese, Traditional Chinese, Japanese, and Korean? According to the methods given on the Internet, it seems that Chinese, Japanese, and Korean can be distinguished, but how to distinguish between Simplified and Traditional Chinese? {code...}

高洛峰 2017-05-24 11:33:59 0  3  607

Distinguish between idle shell exchange window and text window

The teacher quietly used the idle shell exchange window during the lecture. How to distinguish between the idle shell exchange window and the text window when writing programs?

平凡 2018-09-10 14:42:39 0  1  1523

php framework - Why do lightweight frameworks like slim not strictly distinguish between model layers?

Why do lightweight frameworks like slim not strictly differentiate between model layers?

PHP中文网 2017-05-16 17:05:35 0  1  551

android - How to distinguish private network from public network in php?

The designated network is a private network, except that all are public networks. How to distinguish it? Can anyone with experience in similar needs know?

淡淡烟草味 2017-05-24 11:30:57 0  3  548

apache - url address rewriting How to distinguish '? ' question mark

Address: http://localhost/aaa/bbb-ccc=222 RewriteRule ^([a-z,\/,_,0-9]*)-(.*)$ index.php?routeee=$1&$2 [L] When using '-' to distinguish the address URL, the data can be obtained. '-' is equivalent to a separator Array ([routeee] => a...

ringa_lee 2017-05-16 17:04:10 0  1  545

javascript - How can I implement partition scrolling on the mobile side?

I would like to ask how to implement different areas on the mobile terminal to have their own scroll bars and linkage. How can I make the menu and the corresponding food have their own scroll areas, then slide to a certain position on the right and link to switch on the left? I can try to implement ...

迷茫 2017-05-19 10:30:54 0  2  489

javascript - How to distinguish whether hammer.js panend ends with panleft or panright?

How to distinguish whether hammer.js panend ends with panleft or panright? After looking at the output parameters, I can’t seem to find them..

扔个三星炸死你 2017-07-05 10:35:49 0  1  914

javascript - Ask jq about distinguishing element types.

If the divs in the picture are of different types, I now want to put the different types of divs into an object (the object consists of the top, left and id of the div) to form an array. How can I distinguish different types of divs in the upload background? Add different classes to div to judge? Th...

过去多啦不再A梦 2017-05-19 10:42:27 0  2  532

If the number of seconds is consistent with the timestamp, how does he distinguish whether it is the timestamp or the number of seconds?

If the number of seconds is consistent with the timestamp, how does he distinguish whether it is the timestamp or the number of seconds?

蒙奇D路飞 2021-11-06 18:08:05 0  2  878

Limitations before a table can be sharded or partitioned

I'm new to database system design. After reading many articles, I am really confused what is the limit we should have 1 table without sharding or partitioning. I know it's really difficult to provide a general answer, things depend on factors like row size, data type (string, blob, etc.), number of ...

P粉190883225 2024-01-16 13:32:16 0  1  417

Mysql partition error, and how to optimize the novel subscription table?

{Code...} mysql reported this error when creating a partition: For RANGE partitions each partition must be defined. what is the reason. In addition, this is a chapter subscription form for the novel. Used to record which chapter of which book the user has subscribed to. There are currently 3000W pie...

仅有的幸福 2017-05-18 10:53:57 0  1  835

Difference between allocation and unpacking of arrays

So I have this JavaScript code, what is the difference between LineA and LineB constarr1=[1,2,3,4,5]constarr2=[...arr1];//LineAconstarr2=arr1;//LineB so I want Know whether these two assignment methods are the same or have some differences

P粉287254588 2023-08-13 16:31:45 0  1  446

"Partition-based counter rewriting"

I use mysql and php with phpmyadmin. I have a major problem with partition based counters that I would like to improve, but my SQL knowledge prevents me from doing so. I'm very distressed by this. I want my table to have a counter for duplicate data, if the value gets a duplicate it adds a number af...

P粉618358260 2024-01-10 17:44:52 0  1  502

How to differentiate between spread operator and remainder operator in JavaScript?

The syntax is the same, so how does JavaScript differentiate between the two under the hood? Is it judged based on the data type of the variable being operated on? Or is it based on where the variable is used? Or neither?

P粉022501495 2023-09-04 11:25:07 0  2  486

linux - Why do many people recommend manual partitioning when installing Ubuntu?

When installing Ubuntu, many people recommend selecting more options during installation and then manually partitioning swap, home, etc. Are there any disadvantages to directly selecting the default option for installation? I use the default options and there seems to be nothing wrong with them?

某草草 2017-05-16 13:18:04 0  3  1006

Teacher, has the function of distinguishing members been implemented? It's just that different members have different playback times.

Teacher, has the function of distinguishing members been implemented? It’s just that different members have different playback times.

我来也 2019-07-31 18:40:32 0  1  1220