How to create a custom function of PHP function?

How to create a custom PHP function? Define function name and parameters (optional). Use curly braces to write the function body. Use the return statement to return the result (optional).

Create custom PHP functions

Introduction

PHP functions are reusable A block of code that receives parameters, performs operations, and returns results. In some cases, we need to create our own functions to meet specific needs. This article will guide you on how to create and use custom PHP functions.

Syntax

The syntax to create a custom function is as follows:

function function_name(argument1, argument2, ..., argumentN) {
    // 函数体
}

Where:

• function_name: The name of the function
• argument1, argument2, ..., argumentN: Parameters of the function (optional)
• Function body: Code executed inside the function

Practical case

Let us create a custom function named sum(), which will Receives two parameters and returns their sum:

function sum($num1, $num2) {
    return $num1 + $num2;
}

Example usage

$result = sum(10, 20); // 调用函数
echo $result; // 输出结果（30）

Note:

• Function Name must be unique.
• Parameters can have default values, and if no parameter value is provided when calling the function, the default value is used.
• The function body can use the return statement to return a value or return no value (void function).

Conclusion

Creating custom PHP functions is a powerful and flexible way to reuse code, break down complex logic, and improve readability . By following the steps in this article, you can easily create your own functions that add adaptability and power to your PHP code.

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