What characters are the keywords used to define functions in PHP?

The keyword for defining functions in PHP is function. It specifies the function name, parameter list and function body: function function name (parameter list): defines the function name and parameters. {}: The function body contains the code to be executed. return: optional, returns the value of the function.

The keywords that define functions in php

The keywords that define functions in php arefunction.

Syntax

<code class="php">function 函数名 (参数列表) {
    // 函数体
}</code>

Example

Define a function named sum for calculation The sum of two numbers:

<code class="php">function sum(int $num1, int $num2) {
    return $num1 + $num2;
}</code>

Parameter list

• Parameter list specifies the parameters passed to the function.
• Each parameter must specify its type (optional) and name.
• The parameter type can be a built-in type (such as int, float, string, etc.) or a custom type.

Function body

• The function body contains the code to be executed inside the function.
• The function can return a value or no value.
• Use the return statement to return a value.

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