PHP different page method calling method calling method calling method

PHP is a widely used server-side scripting language. It supports a variety of different method calling methods, allowing program developers to program more flexibly. This article will briefly introduce the methods of calling different page methods in PHP and how to call them.

1. Definition of function

To define a function in PHP, you can use the following syntax:

function functionName($parameter1, $parameter2, …){
    //函数体代码
}

Among them, functionName is the function name, $parameter1, $parameter2... are The parameter name and function body code are the operations to be performed by the function.

2. Call the function in the same page

After defining the function in PHP, you can directly call the function in the same page, as shown below:

function greetUser($userName){
    echo "Hello " . $userName . "!";
}

greetUser("John"); //输出：Hello John!

In the above In the code, we define a greetUser function, and then call this function directly on the page to output the greeting. To call a function, you only need to add parentheses after the function name and pass in the corresponding parameters.

3. Calling functions between different pages

When calling functions between different PHP pages, you need to use include or require statements to introduce functions from other pages to the current page. The syntax of include and require is as follows:

include "OtherPage.php";  //包含OtherPage.php页面
require "OtherPage.php";  //包含OtherPage.php页面

Among them, include and require will load all functions and variables in the OtherPage.php page. If the included page does not exist, include will generate a warning message, while require will A fatal error occurs.

4. Use session and cookie to make function calls

In PHP, we can also use session and cookie to make function calls. Session is used to save user data between different pages. You can store the function name in the session and obtain the function name in this session in other pages to make function calls. Cookies are also used to store user data. You can store the function name in the cookie and obtain the function name in the cookie in other pages to make function calls.

//将函数名存储在session中
session_start();
$_SESSION['functionName'] = "greetUser";

//在其他页面中获取session中存储的函数名并进行调用
session_start();
$functionName = $_SESSION['functionName'];
$functionName("John");

//将函数名存储在cookie中
setcookie("functionName", "greetUser");

//在其他页面中获取cookie中存储的函数名并进行调用
$functionName = $_COOKIE['functionName'];
$functionName("John");

The above is a brief introduction to using session and cookie to make function calls.

Summary:

Function calls between different pages in PHP can be implemented using include, require, session and cookie. Different calling methods have different usage scenarios, and we need to choose the most appropriate method according to the specific situation. At the same time, when defining and calling functions, we also need to pay attention to relevant specifications and naming rules to improve the readability and maintainability of the code.

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