Numerical function is one of the commonly used functions, and it is also a must for learning mysql. The commonly used ones are as follows: 1. ceil: returns the smallest integer value greater than a certain number: 2. floor: opposite to the previous one, returns less than a certain number The maximum integer value of the number: 3. Round: Returns the rounded value of a certain value: As shown above, the second parameter of round represents the number of decimal places that need to be retained. 4. Truncate: Returns the truncated value of a certain value: The difference here from round is that regardless of the decimal place that needs to be retained, it will be discarded directly. The same second parameter represents the decimal place that needs to be retained. Note: The above examples are all integers, but these functions can also handle negative numbers in the same way. There are more than these numerical functions, but I personally think these are more commonly used, so only these are recorded. Numerical function is one of the commonly used functions, and it is also a must for learning mysql. The commonly used ones are as follows: 1. ceil: returns the smallest integer value greater than a certain number: 2. floor: opposite to the previous one, returns less than a certain number Maximum integer value: 3. round: Returns the rounded value of a certain value: As above
1. Recommended 10 articles about the php ceil() function
Introduction: Numerical function is one of the commonly used functions, and it is also a must for learning mysql. The commonly used ones are as follows: 1. ceil: Returns the smallest integer value greater than a certain number: 2. Floor: Contrary to the previous one, returns the largest integer value less than a certain number: 3. Round: Returns the rounded value of a certain number: As shown above, the first of round The two parameters represent the number of decimal places that need to be retained. 4. Truncate: Returns the truncated value of a certain value: The difference here from round is that no matter what one decimal place needs to be retained after it...
2. Detailed explanation of usage analysis of true division and Floor division in Python3
##Introduction: This article mainly This article introduces the usage of true division and Floor division in Python3, and analyzes the differences and usage techniques between true division and Floor division with examples. Friends in need can refer to
##3.mysql Commonly Used Basic Operation Syntax (12)~~Commonly Used Numerical Functions [Command Line Mode]
4.
MySQL Numeric Operators and Functions
## Introduction: For ordinary addition and subtraction operations, details will not be given here. To explain, take the following example: mysql> SELECT 3+4;+-----+| 3+4 |+-----+| 7 |+-----+1 row in set (0.03 sec)CEIL and FLOORCEIL are rounded up. As long as there are decimal places, no matter how many, they are directly entered into one place. For example: mysql> SELECT CEIL(3.01);
5.
js operation rounding and string segmentationIntroduction: [Rounding] ①parseInt (parse the integer, discard the decimal part, keep the integer part) Syntax: var a =parseInt(5/2); console.log (a) Output 2 ②Math.ceil (round up, if there is a decimal, add 1 to the integer part) Syntax: Math.ceil(5/2) Output 3 ③Math.round (rounded) Syntax: Math.round(5/2) Output 3 ④Math.floor (round down) Math.floo...
6.
JS operation rounding and string segmentationIntroduction: [Rounding] ①parseInt (parse the integer, discard the decimal part, keep the integer part) Syntax: var a =parseInt(5/ 2); console.log(a) Output 2 ②Math.ceil (round up, if there is a decimal, add 1 to the integer part) Syntax: Math.ceil(5/2) Output 3 ③Math.round (rounding) Syntax: Math.round (5/2) Output 3 ④Math.floor (round down) Math.floo... 7. python round up ceil round down floor round round Introduction: python round up ceil round down floor round 8. About the problem of sprintf intercepting decimals Introduction: Problem: Keep 1 decimal place, not rounded, and add a lot of 0s when it is an integer People say to use sprintf('%.1f',$str);, but there are still problems with the results. Finally, this method is used to solve the problem: echo sprintf('%.1f', floor($str)); { Code...} Didn't it say that there is no rounding? Why... 9. About sprintf intercepting decimals Introduction: Problem: Keep 1 decimal place , do not round, and add 0 when it is an integer. Many people say to use sprintf('%.1f',$str);, but there are still problems with the results. Finally, this method is used to solve the problem: echo sprintf('%.1f ', floor($str)); {Code...} Didn't it say there is no rounding? Why... #10. PHP floor function problem. Introduction:: This article mainly introduces the floor function problem of PHP. , students who are interested in PHP tutorials can refer to it. [Related Q&A recommendations]: What does "20/3 | 1" mean in javascript - js. php - Find a regular expression
The above is the detailed content of 10 recommended articles about the php floor() function. For more information, please follow other related articles on the PHP Chinese website!

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.

To protect the application from session-related XSS attacks, the following measures are required: 1. Set the HttpOnly and Secure flags to protect the session cookies. 2. Export codes for all user inputs. 3. Implement content security policy (CSP) to limit script sources. Through these policies, session-related XSS attacks can be effectively protected and user data can be ensured.

Methods to optimize PHP session performance include: 1. Delay session start, 2. Use database to store sessions, 3. Compress session data, 4. Manage session life cycle, and 5. Implement session sharing. These strategies can significantly improve the efficiency of applications in high concurrency environments.

Thesession.gc_maxlifetimesettinginPHPdeterminesthelifespanofsessiondata,setinseconds.1)It'sconfiguredinphp.iniorviaini_set().2)Abalanceisneededtoavoidperformanceissuesandunexpectedlogouts.3)PHP'sgarbagecollectionisprobabilistic,influencedbygc_probabi

In PHP, you can use the session_name() function to configure the session name. The specific steps are as follows: 1. Use the session_name() function to set the session name, such as session_name("my_session"). 2. After setting the session name, call session_start() to start the session. Configuring session names can avoid session data conflicts between multiple applications and enhance security, but pay attention to the uniqueness, security, length and setting timing of session names.


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