PHP logging and analysis skills in small program development

PHP Logging and Analysis Skills in Mini Program Development

Abstract:
With the popularity of mini programs, log recording and analysis have become particularly important for developers. This article will introduce how to use PHP language for logging and analysis in small program development, and provide practical code examples.

1. Introduction

During the development process of small programs, logging is a very important task. It can help developers quickly discover and solve problems, and improve the stability and usability of small programs. As a common back-end language, PHP also plays an important role in the development of small programs. This article will introduce how to use PHP for logging and analysis.

2. Logging

In PHP, we can use the built-in error_log function for logging. This function writes log messages to the specified file. Here is a simple example:

$errorMsg = '这是一个错误消息';
error_log($errorMsg, 3, 'log.txt');

The above code writes the error message $errorMsg to a log file named log.txt. Among them, the first parameter specifies the content of the log message, the second parameter 3 specifies the priority of the log message, and the third parameter is the path of the log file.

3. Log classification

In actual development, we often need to classify logs of different levels. PHP provides different levels of logging. The following are some common examples:

• LOG_EMERG: Emergency situation requiring immediate notification to relevant personnel;
• LOG_ALERT: Immediate action required Action situation;
• LOG_CRIT: Critical situation that may cause system instability;
• LOG_ERR: General error message;
• LOG_WARNING: Warning information, which may cause system abnormalities;
• LOG_NOTICE: General important information;
• LOG_INFO: General information, used for statistics or tracking;
• LOG_DEBUG: Debug information, for developers only.

The following is an example showing how to use different levels of logging:

$errMsg = '这是一个错误消息';
$warningMsg = '这是一个警告消息';
$infoMsg = '这是一条信息';

// 记录错误日志
error_log($errMsg, LOG_ERR, 'log.txt');
// 记录警告日志
error_log($warningMsg, LOG_WARNING, 'log.txt');
// 记录一般信息
error_log($infoMsg, LOG_INFO, 'log.txt');

4. Log Analysis

In addition to logging, we Logs also need to be analyzed in order to detect problems in time and optimize system performance. PHP provides a wealth of log analysis tools and functions. The following are some commonly used examples:

• file_get_contents: Read the contents of the log file;
• explode: Expand the contents of the log file line by line Split into an array;
• foreach: Traverse the log line array and analyze it;
• strpos: Find the specified string appearing in the log line s position.

The following is an example showing how to analyze the log:

$logContent = file_get_contents('log.txt');
$logLines = explode("
", $logContent);

foreach ($logLines as $logLine) {
  if (strpos($logLine, '错误') !== false) {
    // 发现错误日志，进行处理
  } else if (strpos($logLine, '警告') !== false) {
    // 发现警告日志，进行处理
  } else {
    // 处理其他类型的日志
  }
}

5. Summary

This article introduces how to use the PHP language to Perform logging and analysis during mini program development. By properly recording and analyzing logs, developers can better understand the operation of mini programs, discover problems in a timely manner and deal with them. I hope this article has provided some useful tips and ideas for small program developers in terms of logging and analysis.

References:

• PHP official documentation: https://www.php.net/
• Official documentation for small program development: https://developers. weixin.qq.com/miniprogram/dev/

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