Backend Development
PHP Tutorial
Detailed explanation of sprintf function usage in PHP, detailed explanation of sprintf function_PHP tutorial
Detailed explanation of sprintf function usage in PHP, detailed explanation of sprintf function_PHP tutorial
Detailed explanation of sprintf function usage in PHP, detailed explanation of sprintf function
The example in this article describes the usage of sprintf function in PHP. Share it with everyone for your reference. The specific usage analysis is as follows:
The sprintf() function in PHP officially formats the string and outputs it. This article will introduce to you some experience sharing when learning the sprintf() function. I hope it can be helpful to everyone.
PHP function sprintf() The official definition of the function is: sprintf(): writes a formatted string into a variable
The syntax is: sprintf(format,arg1,arg2,arg++);
Parameters:
format: required, convert format
arg1: required, specifies the parameter inserted at the first % symbol in the format string
arg1: Optional, specifies the parameter
inserted at the second % symbol in the format stringarg1++: Optional, specifies the parameters inserted at the third, fourth, etc. % symbols in the format string
The conversion format of the parameter format starts with the percent sign (%) and ends with the conversion character. The following are possible format values.
%% – Returns the percent symbol
%b – binary number
%c – character
according to ASCII value%d – signed decimal number
%e – Continuous counting method (e.g. 1.5e+3)
%u – unsigned decimal number
%f – floating point number (local settings aware)
%F – floating point number (not local settings aware)
%o – octal number
%s – string
%x – Hexadecimal number (lowercase letters)
%X – Hexadecimal number (capital letters)
Here are some demos, the code is as follows:
$str = 'Test what the parameter %% will be replaced with';
echo sprintf($str);
//Return result: Test what the % parameter will be replaced with (%% is replaced with a %)
// 2. %b: This parameter can only replace integer data. If it is a floating point type, only the integer part will be taken, and the data after the decimal point will be ignored. If it is non-integer data. Return 0
$str = 'Parameter %b will be replaced with a binary number';
$arg = '10';
echo sprintf($str,$arg);
//Return result: parameter 1010 will be replaced with a binary number
$arg = 10.23;
echo sprintf($str,$arg);
//Return result: parameter 1010 will be replaced with a binary number
$arg = 'abc';
echo sprintf($str,$arg);
//Return result: parameter 0 will be replaced with a binary number
// 3. %c returns the ASCII code of the character encoding
$arg = 65;
$str = "The ASCII code corresponding to the number {$arg} is %c ";
echo sprintf($str,$arg);
//Return result: The ASCII code corresponding to the number 65 is A
// 4. %d replaces %d in a character with int type. The data requirements are the same as $b
$str = 'ID number is %d ';
$arg = -3;
echo sprintf($str,$arg);
//Return result: ID number is -3
$arg = 4.5;
echo sprintf($str,$arg);
//Return result: ID number is 4
$arg = 'abc';
echo sprintf($str,$arg);
//Return result: ID number is 0
// 5. %s - string
$str = "This is the sprintf string (%s) used for testing. I spent %f yuan today. There are %d stations from Bell Tower to Xiaozhai. Go to work";
$arg = '%s';
echo sprintf($str,$arg,6,5);
//Return result: This is the sprintf string (%s) used for testing. I spent 6.000000 yuan today. There are 5 stops from Bell Tower to Xiaozhai. Go to work
As for other parameters, you can try testing them.
Let’s talk about some uses of this function. For example, when we update multiple fields of all the data in a data table, if we use loop update, it will consume a lot of resources. Here we will use sprintf ( ) function.
When updating the database in batches, I usually use the syntax of case then when end. The basic syntax is as follows:
SET field = CASE id
WHEN 1 THEN 'value1'
WHEN 2 THEN 'value2'
WHEN 3 THEN 'value3'
END
WHERE id IN (1,2,3)
What the above means is that, update the table and set the value of id = 1 to value1, the value of id = 2 to value2, and the value of id = 3 to value3. In this way, the function above the parameters will combine the sql statement into such a SQL statement. Only one SQL can be used for batch updates. The specific method is:
$info = array(1=>'Zhang San',2=>'Li Si',3=>'Wang Wu');
$ids = implode(',',array_keys($info)) //Get all ID strings
//Combined SQL
$sql = "UPDATA user SET username = CASE id";
foreach($info as $id=>$username){
$sql .= sprintf("WHEN %d THEN %s",$id,$username);
}
$sql .= "END WHERE id IN ($ids)";
// $model->query($sql)
The above can complete the batch update operation, and the following where clause ensures that only 3 rows of data are executed.
I hope this article will be helpful to everyone’s PHP programming design.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati
7 PHP Functions I Regret I Didn't Know Before
Nov 13, 2024 am 09:42 AM
If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
