search
HomeBackend DevelopmentPHP TutorialPHP Commonly Used Mathematical Calculation Internal Functions (Mathematical Functions)_PHP Tutorial

This chapter describes several commonly used PHP mathematical calculation internal functions.

General calculations can be solved through operators, such as addition, subtraction, multiplication and division. Using PHP's mathematical calculation internal functions can help us solve some more complex calculations. The following mainly describes the round, floor, ceil, pow, rand, max, min, decbin, bindec, dechex, hexdec, decoct, octdec functions.

round
round - Rounds a floating point number. The round function syntax is as follows:

round(float,precision)
The parameter precision represents the number of digits of precision to be maintained after the decimal point. If the parameter precision is not written, it means rounding to an integer, such as:

echo round(3.4);          // 3
echo round(3.5);             // 4
echo round(3.6);              // 4
If precision is 2, it means rounding to 2 decimal places. An example is as follows:

echo round(1.95583, 2); // 1.96
If the parameter precision is a negative number, it means rounding to the decimal point. For example:

echo round(1241757, -3); // 1242000
floor
floor - Round up by rounding off. The floor function syntax is as follows:

floor (value)
The floor function returns the largest integer not greater than value, that is, the decimal part of value is rounded off. An example is as follows:

echo floor(4); //4
echo floor(4.3); // 4
echo floor(9.999); // 9
ceil
ceil - round to the next nearest integer. The ceil function syntax is as follows:

ceil (value)
The ceil function returns the smallest integer that is not less than value. An example is as follows:

echo ceil(4); //4
echo ceil(4.3); // 5
echo ceil(9.999); // 10
pow
pow - exponentiation. The syntax of the pow function is as follows:

pow (base,exp)
The pow function returns base raised to the power exp. The following example represents finding 2 raised to the power of 8, and the returned result is 256.

echo pow(2, 8); // 256
rand
rand - Generate a random integer. The rand function syntax is as follows:

rand (min,max)
The rand function returns a random integer between the minimum min and the maximum max (inclusive). For example, the following example returns a random integer between 2 and 6.

echo rand(2,6);
max
max - Returns the largest value in the argument.

If the max function has only one parameter and is an array, max returns the largest value in the array.

An example of the max function is as follows:

echo max(1, 3, 5, 6, 7); // 7
echo max(array(2, 4, 5)); // 5
min
min - Returns the minimum value in the argument.

If the min function has only one parameter and it is an array, min returns the smallest value in the array.

Min function example is as follows:

echo min(1, 3, 5, 6, 7); // 1
echo min(array(2, 4, 5)); // 2
decbin
decbin - Convert decimal to binary. The syntax of the decbin function is as follows:

decbin (number)
decbin returns a string, which is the binary representation of the parameter number. An example is as follows:

echo decbin(12);
The result returned by decbin(12) is:

1100
bindec
bindec - Convert binary to decimal. The bindec function syntax is as follows:

bindec (binary_string)
The bindec function converts the binary string binary_string to a decimal integer. An example is as follows:

echo bindec('110011'); //51
dechex, hexdec
dechex - Convert decimal to hexadecimal.

hexdec - Convert hexadecimal to decimal.

Dechex, hexdec function examples are as follows:

echo dechex(47); //2f
echo hexdec('2f'); //47
decoct, octdec
decoct - Convert decimal to octal

octdec - Convert octal to decimal

Decoct, octdec function examples are as follows:

echo decoct(12); //14
echo octdec('14'); //12

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/477507.htmlTechArticleThis chapter describes several commonly used PHP mathematical calculation internal functions. We can solve general calculations through operators, such as addition, subtraction, multiplication, and division. Using PHP's math internal functions, you can...
Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
How do you modify data stored in a PHP session?How do you modify data stored in a PHP session?Apr 27, 2025 am 12:23 AM

TomodifydatainaPHPsession,startthesessionwithsession_start(),thenuse$_SESSIONtoset,modify,orremovevariables.1)Startthesession.2)Setormodifysessionvariablesusing$_SESSION.3)Removevariableswithunset().4)Clearallvariableswithsession_unset().5)Destroythe

Give an example of storing an array in a PHP session.Give an example of storing an array in a PHP session.Apr 27, 2025 am 12:20 AM

Arrays can be stored in PHP sessions. 1. Start the session and use session_start(). 2. Create an array and store it in $_SESSION. 3. Retrieve the array through $_SESSION. 4. Optimize session data to improve performance.

How does garbage collection work for PHP sessions?How does garbage collection work for PHP sessions?Apr 27, 2025 am 12:19 AM

PHP session garbage collection is triggered through a probability mechanism to clean up expired session data. 1) Set the trigger probability and session life cycle in the configuration file; 2) You can use cron tasks to optimize high-load applications; 3) You need to balance the garbage collection frequency and performance to avoid data loss.

How can you trace session activity in PHP?How can you trace session activity in PHP?Apr 27, 2025 am 12:10 AM

Tracking user session activities in PHP is implemented through session management. 1) Use session_start() to start the session. 2) Store and access data through the $_SESSION array. 3) Call session_destroy() to end the session. Session tracking is used for user behavior analysis, security monitoring, and performance optimization.

How can you use a database to store PHP session data?How can you use a database to store PHP session data?Apr 27, 2025 am 12:02 AM

Using databases to store PHP session data can improve performance and scalability. 1) Configure MySQL to store session data: Set up the session processor in php.ini or PHP code. 2) Implement custom session processor: define open, close, read, write and other functions to interact with the database. 3) Optimization and best practices: Use indexing, caching, data compression and distributed storage to improve performance.

Explain the concept of a PHP session in simple terms.Explain the concept of a PHP session in simple terms.Apr 26, 2025 am 12:09 AM

PHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi

How do you loop through all the values stored in a PHP session?How do you loop through all the values stored in a PHP session?Apr 26, 2025 am 12:06 AM

In PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.

Explain how to use sessions for user authentication.Explain how to use sessions for user authentication.Apr 26, 2025 am 12:04 AM

The session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.