How to write the body of a custom PHP function?

The custom PHP function body contains the code block in the function definition. The code block contains the code for the function to perform tasks, including variable usage, task execution and optional return values.

How to write the body of a custom PHP function

In PHP, the body of a function is where the function code is actually executed. It contains the code block for the task to be performed by the function. This article will guide you on how to write a custom PHP function body.

Syntax

The syntax of the PHP function body is as follows:

function function_name() {
    // 函数主体
}

Steps

1. Define function name: Choose a meaningful and descriptive name to express the purpose of the function.
2. Add the function body in curly braces ({}): Place the code block of the task to be performed between { and } .
3. Using variables: If you need to use parameters or other variables passed to a function in the function body, reference them using the $ notation.
4. Execute the task: Contain the code of the task to be performed in the function body. This can include calculations, data manipulation, input/output, and more.
5. Use the return statement (optional) : If you want the function to return a value, use the return statement to remove the value from the function return.

Practical case

We create a PHP function to calculate the sum of two numbers:

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

// 使用函数
$result = sum(10, 20);
echo "总和为：$result"; // 输出：总和为：30

In this example:

• The function name is sum(), which calculates the sum of two parameters.
• The function body contains the code to calculate the sum. The
• return statement returns the $total value from the function.
• Finally, the function is called and stored in the $result variable.

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