class='pingjiaF' frameborder='0' src='http ://www.jb51.net' scrolling='no'>
Sort the array
usort() function uses a user-defined function to sort the array.
*/
function cmp($a, $b) //User-defined callback function
{
if($a==$b) //If the two parameters are equal
{
return 0; //Return 0
}
return($a>$b)?-1:1; //If the first parameter is greater than the second parameter, return 1, otherwise -1
}
$a=array(3,2,5,6,1); //Define an array
usort ($a,"cmp"); //Use a custom function to Array sorting
foreach($a as $key=>$value) //Loop to output the sorted key-value pairs
{
echo "$key:$valuen";
}
/*
Note: If two elements compare identically, their order in the sorted array is undefined. Prior to PHP 4.0.6, user-defined functions would preserve the original order of these elements. But due to the new sorting algorithm introduced in 4.1.0, this will no longer be the case as there is no efficient solution for this.
*/
//Sort array key names uksort(array,sorttype)
function cmp($a, $b) //User-defined callback function
{
if($a==$b) //If the two parameters are equal
{
return 0; //Return 0
}
return($a>$b)?- 1:1; //If the first parameter is greater than the second parameter, return 1, otherwise -1
}
$a=array(4=>"four",3 =>"three",20 =>"twenty",10=>"ten"); //Define an array
uksort ($a,"cmp"); //Use a custom function to sort the array keys
foreach( $a as $key=>$value) //Loop to output the sorted key-value pairs
{ // www.jbxue.com
echo "$key:$valuen";
}/*
The uksort() function uses a user-defined comparison function to sort the array by key name and maintain the index relationship.
Returns true if successful, false otherwise.
This function should be used if the array to be sorted needs to be sorted by an unusual criterion.
The custom function should accept two parameters, which will be filled with a pair of key names in the array. The comparison function must return an integer less than zero, equal to zero, or greater than zero when the first argument is less than, equal to, or greater than the second argument, respectively.
*/
/*
sort() function sorts the values of the given array in ascending order.
Note: This function assigns a new key name to the unit in the array. The original key name will be deleted.
Returns true if successful, false otherwise.
*/
$fruits=array("lemon","orange","banana","apple"); //Define an array
sort($fruits); //Sort the array
foreach($fruits as $key=>$val) //Loop and output the key-value pairs after sorting the array
{
echo "$key=$valn"; / /Output key-value pairs
}

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Dreamweaver Mac version
Visual web development tools

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),

SublimeText3 Chinese version
Chinese version, very easy to use

WebStorm Mac version
Useful JavaScript development tools

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.