How to declare functions in PHP?

PHPz
Release: 2024-04-10 11:03:02
Original
893 people have browsed it

Steps to declare a function in PHP: Use the function keyword to declare a function. Specify parameters after the function name, separated by commas. Use a colon and type to specify the return type (optional). Write the code to be executed in the function body. Returns a value (optional).

如何在 PHP 中声明函数?

#How to declare a function in PHP?

A function is a reusable block of code that performs a specific task and returns a result. In PHP, functions are declared using the function keyword.

Function declaration syntax:

function functionName(parameter1, parameter2, ...) {
    // 函数体
}
Copy after login

Parameters:

A function can accept zero or more parameters. Parameters are the data passed to the function.

Function body:

The function body contains the code to be executed.

Return type:

The function can return a value or not. To specify a return type, use a colon (:) after the function name, and then specify the type. For example:

function sum(int $a, int $b): int {
    return $a + $b;
}
Copy after login

Practical case:

The following is a practical case of declaring a function in PHP and using it:

<?php

// 声明一个返回两个数字之和的函数
function sum(int $a, int $b): int {
    return $a + $b;
}

// 使用此函数
$result = sum(10, 20);

// 打印结果
echo "The sum is: $result";
?>
Copy after login

Output:

The sum is: 30
Copy after login

The above is the detailed content of How to declare functions in PHP?. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
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
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template