How to use PHP scripts for logging in Linux environment

How to use PHP scripts for logging in the Linux environment

Using PHP scripts for logging in the Linux environment is a common and effective method. This article will introduce how to use PHP scripts for logging in a Linux environment and provide specific code examples.

1. Create log file
   First, create a folder in the Linux system for storing logs. You can use the following command:

mkdir /var/log/mylog

In this folder, we will create a log file named "access.log" to record access logs. You can use the following command:

touch /var/log/mylog/access.log

2. Write PHP script
   Next, we will use PHP script to implement the logging function. Create a file named "log.php" and write the following code into it:

<?php

function writeLog($message) {
    $file = '/var/log/mylog/access.log';
    $timestamp = date('Y-m-d H:i:s');
    $log = $timestamp . ' - ' . $message . "
";
    file_put_contents($file, $log, FILE_APPEND);
}

// 示例：记录一条日志
$message = '访问页面 - ' . $_SERVER['REQUEST_URI'];
writeLog($message);

?>

In the above code, we have defined a function named "writeLog" to write The log file writes the log content. This function accepts one parameter (log information), adds a timestamp before each log, and finally writes the entire log to the log file. This way we can call the function wherever we need to log.

In the example, we recorded an access log, which contains the address of the page visited. You can change the content of the log information according to actual needs.

3. Using PHP scripts to record logs
   In order to demonstrate how to use PHP scripts to log in a Linux environment, we will call the above "log.php" script in a simple web page.

Create a file named "index.php" and write the following code into it:

<?php

// 调用log.php脚本记录日志
require_once('log.php');

// 示例：记录一条日志
$message = '访问页面 - ' . $_SERVER['REQUEST_URI'];
writeLog($message);

// 其他业务代码...

?>

In the above code, we first introduced the previously created "log .php" file, and then called the "writeLog" function to record an access log. You can add similar code to other places where logging is required based on actual needs.

4. Verify logging
   Now we can verify that logging is working properly by accessing the "index.php" file.

Enter the following URL in the browser:

http://localhost/index.php

Then, check the log file "access.log" to see if the access log is successfully recorded.

Summary
Through the introduction of this article, we have learned how to use PHP scripts to perform logging in the Linux environment. We created a folder for storing logs and wrote a PHP script to implement the logging function. Then, call the script where logs need to be recorded to write the log information to the specified log file.

Through this method, we can easily implement logging, and view and analyze log information when needed, helping us understand the operation of the system and troubleshoot problems.

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