PHP error handling and exception logging in small program development

PHP error handling and exception logging in mini program development

With the continuous popularity of mini programs, more and more developers are beginning to use the PHP language to develop mini program backends. During development, error handling and exception logging are crucial. This article will introduce how to handle PHP errors and record exception logs in small program development, and give corresponding code examples.

1. PHP error handling

1. Error reporting settings

In PHP, we can modify error_reporting and display_errorsTo control the reporting level and display mode of errors. When we develop small programs, we usually hope that errors can be discovered and fixed in a timely manner in the development environment, and specific error messages are not displayed in the production environment to ensure security. The following is a sample code for error reporting settings:

// 开发环境中显示所有错误
error_reporting(E_ALL);
ini_set('display_errors', 'On');

// 生产环境中不显示错误
error_reporting(0);
ini_set('display_errors', 'Off');

2. Custom error handling function

In addition to using PHP's built-in error handling function, we can also customize error handling function to output error information or do other processing according to actual needs. The following is a sample code for a custom error handling function:

function customErrorHandler($severity, $message, $file, $line) {
    echo "错误信息：{$message}，文件：{$file}，行号：{$line}";
}

// 设置错误处理函数
set_error_handler("customErrorHandler");

The above code outputs error information to the browser, and you can modify the output method as needed.

2. Exception logging

In the process of developing small programs, we need to record exception information so that we can troubleshoot and fix it when necessary. The following is a simple example code for exception logging:

function customExceptionHandler($exception) {
    $message = $exception->getMessage();
    $file = $exception->getFile();
    $line = $exception->getLine();
    $trace = $exception->getTraceAsString();

    $logMessage = "异常信息：{$message}
文件：{$file}
行号：{$line}
堆栈跟踪：
{$trace}

";

    // 写入日志文件
    file_put_contents('/path/to/error.log', $logMessage, FILE_APPEND);
}

// 设置异常处理函数
set_exception_handler("customExceptionHandler");

The above code records exception information to the specified log file. You can modify the path and file name of the log file as needed.

3. Application of error handling and exception logging

In actual development, we usually set error handling and exception handling functions in the project entry file. The following is a complete sample code:

// 错误报告设置
error_reporting(E_ALL);
ini_set('display_errors', 'On');

// 自定义错误处理函数
function customErrorHandler($severity, $message, $file, $line) {
    echo "错误信息：{$message}，文件：{$file}，行号：{$line}";
}

// 自定义异常处理函数
function customExceptionHandler($exception) {
    $message = $exception->getMessage();
    $file = $exception->getFile();
    $line = $exception->getLine();
    $trace = $exception->getTraceAsString();

    $logMessage = "异常信息：{$message}
文件：{$file}
行号：{$line}
堆栈跟踪：
{$trace}

";

    // 写入日志文件
    file_put_contents('/path/to/error.log', $logMessage, FILE_APPEND);
}

// 设置错误处理函数
set_error_handler("customErrorHandler");

// 设置异常处理函数
set_exception_handler("customExceptionHandler");

// 其他代码...

Through the above settings, we can promptly discover and solve PHP errors when developing small programs, and at the same time record the exception information into the log file to facilitate subsequent troubleshooting. .

Summary:

For PHP error handling and exception logging in small program development, it is very important to set the error reporting level, custom error handling functions and exception handling functions. Reasonably set the error reporting level and display method, and distinguish between development and production environments; customize error handling and exception handling functions to output error information or record exception logs according to actual needs. The sample code provided above can help you better handle errors and record exception information, and improve the efficiency and quality of small program development.

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