Five ways to pass parameters between different PHP files

In PHP development, it is often necessary to transfer data between different PHP files to implement program functions. Sometimes we need to pass some parameters to another PHP file or page, such as passing an ID number to a PHP file, or passing some query conditions to a list page.

This article will delve into five methods of passing parameters between different PHP files.

Method 1: Pass parameters through the GET method

The GET method is a commonly used parameter passing method in the HTTP protocol. By passing parameters through the GET method, you can add the parameters that need to be passed to the URL address. The browser sends the request to the server. After receiving the GET request, the server parses the URL address and extracts the parameters for processing.

For example, to pass an ID number to a PHP file, you can do it in the following way:

<a href="detail.php?id=123">点击查看详情</a>

In the above code, we added an id parameter to the link and set an The specific value is "123". When the user clicks this link, the browser will send a GET request to the server, which will contain an id parameter with a value of "123". The server can implement related functions based on this value.

In PHP, you can get the parameter value in the GET request through the $_GET global variable, as shown below:

$id = $_GET['id'];

In the above code, we pass $_GET['id'] The value "123" of the id parameter in the URL is obtained.

Method 2: Pass parameters through the POST method

The POST method is also one of the commonly used parameter passing methods in the HTTP protocol. Through the POST method, the parameters that need to be passed can be placed in the request body and sent to the server by the browser. After receiving the POST request, the server parses the request body and extracts the parameters for processing.

For example, to pass a username and password to a PHP file, you can do it in the following way:

<form action="login.php" method="post">
    用户名：<input type="text" name="username"><br>
    密码：<input type="password" name="password"><br>
    <button type="submit">登录</button>
</form>

In the above code, we created a form and set up the submission of the form. The address is "login.php" and the submission method is POST. When the user fills in the username and password in the form and clicks the login button, the browser will send a POST request to the server. The request body contains the values ​​of the parameters "username" and "password". The server can implement related functions based on these values. .

In PHP, you can get the parameter value in the POST request through the $_POST global variable, as shown below:

$username = $_POST['username'];
$password = $_POST['password'];

In the above code, we pass $_POST['username'] and $_POST['password'] obtain the parameter value in the POST request.

Method 3: Pass parameters through the SESSION method

The SESSION method is a common parameter passing method in PHP. Through the SESSION method, the parameters that need to be passed can be stored in the server-side memory and shared by all PHP programs. Parameters passed in this way can be used anywhere in the entire PHP application.

For example, to pass a username to a PHP file, you can do it in the following way:

session_start();
$_SESSION['username'] = 'user';

In the above code, we call the session_start() function to open a SESSION session . Then store a string "user" in SESSION through $_SESSION['username']. In other PHP files, you only need to call the session_start() function and access $_SESSION['username'] to get the value of this parameter.

Method 4: Pass parameters through the COOKIE method

The COOKIE method is also a common parameter passing method in PHP. Similar to the SESSION method, the COOKIE method also stores data on the client browser, but the data stored by the COOKIE method still exists after the browser is closed.

For example, to pass a username to a PHP file, you can do it in the following way:

setcookie('username', 'user', time()+3600);

In the above code, we called the setcookie() function to change the username "user " is stored in a COOKIE named "username", and the expiration time of the COOKIE is set to one hour later. In other PHP files, you only need to call $_COOKIE['username'] to get the value of this parameter.

Method 5: Passing parameters through file inclusion

The file inclusion method can also realize parameter transfer between different PHP files. Through the include or require function, you can include one PHP file into another PHP file and pass some parameter values.

For example, to pass an ID number to a PHP file, you can do it in the following way:

include 'detail.php?id=123';

In the above code, we use the include function to include the detail.php file into the current PHP script, and passed a parameter named "id" with a value of "123". In the detail.php file, the value of this parameter can be obtained through $_GET['id'].

To sum up, the above five methods can all realize parameter transfer between different PHP files. The specific method to choose depends on the specific scenario.

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