Code implementation of PHP rolling log_PHP tutorial
Code implementation of PHP rolling log
PHP rolling log library
PHP records logs. I have come across a log recording method that divides folders into folders by year and month, and then divides files into files by day. This method has advantages and disadvantages and has its usage scenarios. What I want to talk about today is another way. A logging method - file rolling method to record logs. Of course, this rolling mechanism can also be added to the previous logging method.
How to make the log scroll
Rolling log, as the name suggests, uses a series of log files to record the log of a module. The number of files in the same module is limited, up to maxNum, and the size is also limited, up to maxSize bytes. The file name has a certain naming method, such as : testlog.log, testlog_1.log, testlog_2.log,,,,,, where testlog.log is the log file in use. When the testlog.log file size reaches the limit maxSize, the log file will be rolled backwards, like As follows:
The code is as follows:
testlog_2.log -> testlog_3.log
testlog_1.log -> testlog_2.log
testlog.log -> testlog_1.log
testlog.log #0kb
When the number of log files reaches the limit maxNum, the elimination mechanism will be started and the oldest log will be deleted. For example, if maxNum is set to 10, there will be a maximum of 10 files including testlog.log at this time. When scrolling If testlog_9.log exists, it will start rolling from testlog_8.log and overwrite testlog_9.log. This ensures normal log recording and does not cause large log files to appear, ensuring the normal operation of the log system.
Code implementation
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 |
final class LOGS { private $level; private $maxFileNum; private $maxFileSize; private $logPath; private $file;
//日志的级别DEBUG,MSG,ERR const LOGS_DEBUG = 0; const LOGS_MSG = 1; const LOGS_ERR = 2;
private static $instance = null;
private function __construct(){}
public static function getInstance() { if(self::$instance == null) { self::$instance = new self(); } return self::$instance; }
/** * @Desc initialization * @Param $level int record level * @Param $maxNum int Maximum number of log files * @Param $maxSize int Maximum log file size * @Param $logPath string log file saving path * @Param $file string log file name prefix * @Return boolean */ public function init($level, $maxNum, $maxSize, $logPath, $file) { $level = intval($level); $maxNum = intval($maxNum); $maxSize = intval($maxSize); !is_dir($logPath) && mkdir($logPath, 0777, true); if(!in_array($level, array(self::LOGS_DEBUG, self::LOGS_MSG, self::LOGS_ERR)) || $maxNum { return false; } $this->level = $level; $this->maxFileNum = $maxNum; $this->maxFileSize = $maxSize; $this->logPath = $logPath; $this->file = $file; return true; }
/** * @Desc Get formatted time string */ public function formatTime() { $ustime = explode ( " ", microtime () ); return "[" . date('Y-m-d H:i:s', time()) .".". ($ustime[0] * 1000) . "]"; }
/** * @Desc rolling log file */ public function log($str) { $path = $this->logPath.DIRECTORY_SEPARATOR.$this->file.".log"; clearstatcache(); if(file_exists($path)) { if(filesize($path) >= $this->maxFileSize) { $index = 1; //获取最大的滚动日志数目 for(;$index maxFileNum; $index ) { if(!file_exists($this->logPath.DIRECTORY_SEPARATOR.$this->file."_".$index.".log")) { break; } } //已经存在maxFileNum个日志文件了 if($index == $this->maxFileNum) { $index--; } //滚动日志 for(;$index > 1; $index--) { $new = $this->logPath.DIRECTORY_SEPARATOR.$this->file."_".$index.".log"; $old = $this->logPath.DIRECTORY_SEPARATOR.$this->file."_".($index - 1).".log"; rename($old, $new); }
$newFile = $this->logPath.DIRECTORY_SEPARATOR.$this->file."_1.log"; rename($path, $newFile); } } $fp = fopen($path, "a b"); fwrite($fp, $str, strlen($str)); fclose($fp); return true; }
/** * @Desc records debugging information * @Param string log information * @Param string The file where the log is located * @Param string log line */ public function debug($msg, $file, $line) { if($this->level { $this->log($this->formatTime()."[{$file}:{$line}]DEBUG: ${msg}n"); } }
/** * @Desc record information * @Param string log information * @Param string The file where the log is located * @Param string log line */ public function msg($msg, $file, $line) { if($this->level { $this->log($this->formatTime()."[{$file}:{$line}]MSG: ${msg}n"); } }
/** * @Desc logs error messages * @Param string log information * @Param string The file where the log is located * @Param string log line */ public function err($msg, $file, $line) { if($this->level { $this->log($this->formatTime()."[{$file}:{$line}]ERR: ${msg}n"); } } } |
看个例子
#例子中设置记录级别为msg(此时debug信息是不会纪录的),日志文件个数为5,大小为200个字节(测试方便),文件名称为testlog
3 4
5
$logs = LOGS::getInstance();
$logs->init(1, 5, 200, "./", 'testlog'); |
当我们不停的运行这个例子的时候,会在代码所在文件夹下生成5个文件就像下面这样:
|

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.

To protect the application from session-related XSS attacks, the following measures are required: 1. Set the HttpOnly and Secure flags to protect the session cookies. 2. Export codes for all user inputs. 3. Implement content security policy (CSP) to limit script sources. Through these policies, session-related XSS attacks can be effectively protected and user data can be ensured.

Methods to optimize PHP session performance include: 1. Delay session start, 2. Use database to store sessions, 3. Compress session data, 4. Manage session life cycle, and 5. Implement session sharing. These strategies can significantly improve the efficiency of applications in high concurrency environments.

Thesession.gc_maxlifetimesettinginPHPdeterminesthelifespanofsessiondata,setinseconds.1)It'sconfiguredinphp.iniorviaini_set().2)Abalanceisneededtoavoidperformanceissuesandunexpectedlogouts.3)PHP'sgarbagecollectionisprobabilistic,influencedbygc_probabi

In PHP, you can use the session_name() function to configure the session name. The specific steps are as follows: 1. Use the session_name() function to set the session name, such as session_name("my_session"). 2. After setting the session name, call session_start() to start the session. Configuring session names can avoid session data conflicts between multiple applications and enhance security, but pay attention to the uniqueness, security, length and setting timing of session names.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

Atom editor mac version download
The most popular open source editor

Zend Studio 13.0.1
Powerful PHP integrated development environment