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MySQL 'IN' operator for handling large numbers

I'm observing strange behavior that I'm trying to understand. MySQL version: 5.7.33 I have the following query: select*froma_tablewheretime>='2022-05-10'andguidin(102,512,11,35,623,6,21,673);a_table has primary key on time, guid and index on guid The query I wrote above has very good performance,...

P粉190443691 2023-12-20 22:54:33 0  1  576

nginx - Tens of millions of requests to a php from different IPs, is this a CC attack? How to prevent it?

As mentioned, static files can be accessed normally, but PHP does not respond. Looking at the nginx log, the same PHP URL is being requested in large numbers. Currently, there are 5 load balancers handling it. Each one has millions of requests every day, and the IP addresses are different. . For the...

世界只因有你 2017-05-16 17:16:21 0  2  603

c++ - Which PHP extension source code is most suitable for novices to learn and read?

RT, my current level is that I have learned C language, and then I have written a simple extension myself (a very simple extension). Now I want to learn more about it. There are many extensions built into the official PHP source code package. I looked at something like The amount of extension code f...

過去多啦不再A夢 2017-06-05 11:07:15 0  1  711

linux - Problems with simulating crontab timer and implementing message queue with PHP and MySQL? ?

For example, if you need to create a function to send mobile phone text messages in batches, if you use a for loop to do it, when the number of text messages is large, it will not only be time-consuming, but also have a very low success rate. So I thought of using PHP and MySQL to implement a messag...

巴扎黑 2017-05-19 10:07:28 0  4  808

How to find JSON data based on other content in a JSON object when duplicates exist?

I'm currently implementing some data charts on a website, and I have a JSON that contains some data, specifically some ID numbers, some dates, and some data points. Because I have multiple dates under the same ID, I'm looking for a way to do essentially "find a JSON object with this ID and mont...

P粉713846879 2024-04-04 10:57:45 0  1  729

javascript - Regarding the issue of ajax uploading multiple images.

I don’t know how ajax uploads multiple images and sends them to the background. For a single image, you can use base64 to send it to the backend, but if there are multiple images, this method is not suitable because the base64 will be very large. In what way is it sent to the backend? If the backgro...

我想大聲告訴你 2017-06-26 10:55:20 0  5  782

How to disable PHP reporting SQL errors?

I have my own PHP data class that logs MySQL errors to a txt file using mysqli_error($this->conn). Everything was working fine until I set PHP error handling to E_ALL. Now PHP intercepts the error and it doesn't have a chance to be handled by my MySQL error handler. This wouldn't be a problem exc...

P粉550257856 2023-09-05 17:14:24 0  1  796

The traffic between PHP+Mysql website front-end and data server is extremely high

PHP + MYsql front-end and database are separated. Now the communication traffic between the front-end and the database server is very large, and the load on the MYsql database server is too high (up to 398%). The login of front-end users is also very slow. The number of people online at the same tim...

hello 2018-10-21 20:17:20 0  3  1534

Please take a look and teach me this newbie.

I now have a table like this. The numbers in it are ages, which are read from the database. The following is the PHP code. The effect I want now is to divide the colors according to the zodiac, (for example: 01, 13, 25, 37, 49 If the zodiac sign is Rooster, write Rooster below the age, with a red ba...

大浪淘金 2017-07-22 15:08:00 0  4  1320

Laravel Modal does not return data

I don't know why I'm not getting the value from the modal in my Laravel controller. Please check it for me. However, I use the same code for other modes and controllers. It's working and returning the value from the property without any issues. I'm using Laravel8 and php8.1; below is my code. app\Ht...

P粉174151913 2024-03-29 10:31:31 0  1  586

Can I use the automatic generation module of thinkphp5 in Windows 7 system? How to configure and use

明民 2017-10-10 17:04:14 0  2  1379

After installing the PHP toolbox, all the mysql tables in phpstudy that I installed before are gone. What should I do?

After installing the PHP toolbox, all the mysql tables in phpstudy that I installed before are gone. What should I do?

劉袁銘 2017-10-10 19:25:59 0  4  2935

mcrypt_get_key_size()

To use mcrypt_get_key_size() in php study, how to enable mcrypt_

劉袁銘 2017-10-10 19:47:34 0  1  1167

Detecting login status and preventing repeated login status in TP5 - My page is wrong

冥冥之中天注定 2017-10-10 22:49:15 0  0  1180

Issues with resending WeChat public account template messages?

For example: I am using PHP to develop WeChat public accounts. If I send a template message, the WeChat client may receive 1-3 messages. I checked Baidu and said that the WeChat server will resend in 5 seconds. How to solve this problem?

飛揚(yáng) 2017-10-11 08:00:11 0  0  1137

How to install php7

我無限黑暗里的小太陽▼ 2017-10-11 09:11:44 0  1  1143

Solve (no language limit)

A census taker asked a woman, "How many children do you have and how old are they?" The woman replied, "I have three children. Their ages multiplied is 36. The sum of their ages is equal to the house number of the segregated room." Census The enumerator immediately went to the ne...

路過 2017-10-11 10:20:08 0  1  1359

There is no WWW file in the phpStudy directory. Enter localhost in the website and the hello world solution will come out directly! I created the WWW folder in the root directory and then created an abc.php. localhost/abc.php still didn't come out and an error was reported. not found

<?phpphpinfo();?>

M..moli瞎 2017-10-11 11:45:27 0  7  5206

Find an authoritative and practical development tutorial or article on WeChat scan code authorization to log in to the website

Find an authoritative and practical development tutorial or article on WeChat scan code authorization to log in to the website

極世 2017-10-11 12:33:15 0  1  1681

How to uninstall phpstudy.

whlyx 2017-10-11 15:53:03 0  2  1764