Components in PHP functions

PHP function components include: Access modifiers: specify function access permissions, such as public, protected, private. Function name: consists of letters, numbers and underscores, starting with a letter. Parameter list: Specifies the input variables accepted by the function, which can be passed by value or by reference. Function body: Contains the code statements for function execution.

Components of PHP function

PHP function consists of the following parts:

• Access modification Symbol
• Function name
• Parameter list
• Function body

Access modifier

Access Modifiers specify the access rights of the function, with the following values:

• public: All code can access
• protected: Only accessible by Access by class and its subclasses
• private: Accessed only by the class itself

Function name

Function name Consists of letters, numbers, and underscores, and must begin with a letter.

Parameter list

The parameter list specifies the input variables accepted by the function. Parameters can be passed by value or by reference. Passing by value creates a copy of the variable, while passing by reference allows a function to modify the original variable directly.

Function body

The function body is the code block of the function. It contains the statements to be executed by the function.

Practical case

The following is a practical case of creating and using PHP functions:

<?php
// 定义函数
function sayHello($name) {
    echo "Hello $name!";
}

// 调用函数并传递参数
sayHello("John Doe");
?>

Output:

Hello John Doe!

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