In PHP, we can achieve variable number of parameter passing by adding three dots (...) in front of the method parameters. This method is also called "variable parameter list" or "indefinite number of parameters".
Let’s take a look at the specific usage and details.
Basic syntax
In PHP, when we declare a method, we can add three dots in front of the method parameter to indicate that the parameter is variable, for example:
function myFunc(...$args) { // 执行代码 }
In this code, the three dots in front of the $args
parameter indicate that it is a variable-length parameter list. This means that when calling the myFunc()
method, we can pass any number of parameters, and these parameters will be placed in the $args
array.
Usage method
When using variable-length parameters, we can call it in the following way:
myFunc(1, 2, 3, 4);
In this example, we call myFunc()# Four parameters are passed in ##, and they will be placed in the
$args array.
function extractByKey($key, ...$arrays) { $result = array(); foreach ($arrays as $array) { if (array_key_exists($key, $array)) { $result[] = $array[$key]; } } return $result; }In this example, we first define A
$key variable indicating the key name to be extracted. Then we use a variadic argument list to pass the array that needs to be extracted.
$result array to represent the final extracted result. Then we iterate through all the arrays passed in the variable parameters to determine whether
$key exists in the array. If it exists, we add the value corresponding to
$key in the array to the
$result array.
$result array, which contains the specified key-value pairs extracted from all arrays.
The above is the detailed content of PHP calls method parameters in front of.... For more information, please follow other related articles on the PHP Chinese website!

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

Atom editor mac version download
The most popular open source editor

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.

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
