A question about the varchar in MySQL

Why do many people like to use VARCHAR (255) in MySQL? Reply content: Why do many people like to use VARCHAR (255) in MySQL? 1. Historical reasons varchar only supports 0-255byte before MySQL 5.0.3, only after MySQL 5.0.3 is supported to 0-655

What's the difference between GB18030 and UTF-8?

What's the difference between GB18030 and UTF-8? Reply content: What's the difference between GB18030 and UTF-8? GB18030Is the Chinese standard, GB, is how to represent a character. Unicode only gives the number of a character, and does not

Echo ' <? '; return empty

Echo ' The output is empty, considering that it may have been parsed by PHP But what I want to do is to textare the PHP statement directly back to the results of PHP parsing Can be implemented with Eval but cannot return any errors, So I want to

PHP.ini, how are the two limitations of max_input_nesting_level and Max_input_vars understood?

My site has only a layer of variables, similar to/index.php?a=a&b=b, will not appear/index.php?a[a]=aa&a[b]=ab, the number of not more than 2. But the test is only set to the following to not error: max_input_nesting_level=2 First of all I think

PHP Project index.php file, project is written by native PHP

fecaca56a326610b24626b163814a02c '. $_get[' userId ']. ' ' . $_get[' Sid ']. ' '; $sessionServer = "Http://mzwa-123.665

JAVASCRIPT-JS Create an IMG tag based on the number of SRC?

HTML section: JS Code: function preloader(){ // create object imageObj = new Image(); // set image list images = new Array(); images[0]="image1.jpg"; images[1]="image2.jpg";

Vagrant Environment Construction cannot read local box

Last Login:sat Jan 14:35:58 on consoleduncandemini:~ duncan$ CD hhexo.rar homestead/duncandemini:~ duncan$ CD Homes Tead/duncandemini:homestead duncan$ vagrant upbringing machine ' default ' up with ' VirtualBox ' provider...==> default: Box '

Phpcms the code below to invoke the Add () method under the content module in the specified location to submit the data, how to implement?

, submitted by other pages $_post[' info ' article data to the current page, after the authorization and column validation or judgment, using the content controller's Add method to submit to the database? How should I write? Reply content: ,

Symfony2 onetomany Problem!

Now there are two tables, category and article. Category /** * @Mapping\Entity * @Mapping\Table(name="category") */class Category{ /** * @Mapping\Id * @Mapping\Column(type="integer") * @Mapping\GeneratedValue(strategy="AUTO") */

What is the content preservation mechanism of the answer box?

Answer questions every time the answer box loses focus, it triggers an event to send a request to the server to save the current inputChange the machine and the browser to get it here.But the cache is erased.Is it because it's _xsrf this cookie to

WebSocket-[Kneeling for]socket.io PHP version Client connection code

At present, there is a demand above, is to connect the other side of the Socket.io server, and then receive data and storage. However, there is currently no PHP version of the Socket.io Client connection code, only the server, so here to request a

How to get the number of full weeks within a period of time Segmentfault

How to get the number of full weeks (Monday to weekends) within a period of time what better way PHP has Reply content: How to get the number of full weeks (Monday to weekends) within a period of time what better way PHP has The amount ...

File upload-php upload large file (above 100M)

PHP How to upload large files, configuration as if the maximum set to 8M, I would like to know how to upload a hundreds of m file (do not use specialized client software), it seems to be a shard What, do you know how to do it? Reply content:

What are the differences between post and put in HTTP in the actual application?

According to the information on the Internet, post is used to create resources and put to update resources. Now that the Nginx is built, the put can actually upload the file to the specified location and update the specified file. So can post

Regular Expressions-PHP, how to write regular replacements?

There are strings: ' sdfujer[ema14]xx[emb15],43 you 56^&%^% me [EMC7]] []] where [EMA14],[EMB15],[EMC7], is the content to be replaced, ' [em ' begins, '] ' ends, the middle consists of letters plus numbers Replace all of them with this structure,

PHP: Can't reference css file?

Recently learning PHP, to the third chapter of the time stuck. I quoted an HTML template, but this template cannot reference a CSS file, which is the HTML template: Your Website catchy slogan...

Who has a better understanding of the discuz, each user has their own time zone, the background can be set up, which realizes the internationalization AH

Discuz User's home page can see its time zone, background can also set time zone, this is the international route Ah I'm thinking about it. The whole system is not used for Greenwich Mean time, and then converted to local times based on the user's

Do you use the session for the website now? No more cookies?

Is the cookie useless? Reply content: Is the cookie useless? No one seems to be talking about the point. Simply put, the session stores the link state/data on the server side, and the cookie is the link state/data that is recorded on the

Hello everyone, how does the general authority control system do? Rabc,auth Authority authentication?

Hello everyone, how does the general authority control system do? Rabc,auth Authority authentication? Reply content: Hello everyone, how does the general authority control system do? Rabc,auth Authority authentication? Do you know, people?

MySQL limit paging generally check how many pages, limit how many will have performance problems?

General article paging is limit 20 data about, I do not know why, limit the biggest performance bottleneck where, the biggest value in where, a one-time fetch 5,000 have no problem, 10,000, how much suitable, good not, each page to take 20 too

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