Unpacking the elements of a PHP function

PHP function syntax: Function name: starts with a letter or underscore, contains only letters, numbers, and underscores, and is case-sensitive. Parameters: Can accept one or more variables, type is scalar or complex type. Return value: Return using the return statement, or NULL if there is no return.

Disassemble the elements of the PHP function

Understand the syntax of the function

The syntax of the PHP function follows the following format:

function function_name(parameter1, parameter2, ...) {
    // 函数的主体
}

Function name

The function name is a collection of identifiers. It must start with a letter or underscore, and can only contain letters, numbers, and underscores. Function names are case-sensitive.

Parameters

The function can accept one or more parameters. Parameters are variables available within the function body. Parameter types can be scalars (such as integers, strings, etc.) or complex types (such as arrays, objects, etc.).

Return value

A function can return a value or no value. Use the return statement to return a value. Without the return statement, the function returns NULL.

Practical case: Calculate the area of ​​a triangle

<?php
// 定义计算三角形面积的函数
function triangle_area(float $base, float $height): float {
    // 计算面积
    $area = 0.5 * $base * $height;
    // 返回面积
    return $area;
}

// 输入底边和高度
$base = 10;
$height = 5;

// 计算并打印三角形面积
$area = triangle_area($base, $height);
echo "三角形的面积为：$area 平方单位";
?>

In this example, the triangle_area function accepts two parameters: base and height. It calculates and returns the area of ​​a triangle.

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