Error log processing method for PHP development in WeChat applet

With the widespread application of WeChat applets, more and more applets are developed in PHP language. During the development process, developers often encounter some errors and exceptions that need to be handled in a timely manner. Among them, the processing of error logs is very important, which can help us find problems in time and repair them. This article will introduce how to use the error log processing method developed in PHP language in WeChat applet.

1. Why error logging is needed

When developing WeChat applet, we can use PHP language for development. However, the probability of errors in PHP language code is relatively high, so errors need to be handled. The occurrence of abnormal situations will have an impact on the normal operation of the mini program, so exceptions need to be handled in a timely manner.

Error logging is a method of recording errors that occur when the system is running. It can help developers find errors in time and fix them. Through error log recording, we can understand where the program has problems, the type of problem and the specific error information, which provides us with great convenience for program debugging.

2. Error logging method

1. PHP’s error log function

In the PHP language, a series of error log functions are provided. These functions can help us record error logs and output error information, allowing us to quickly locate problems. These functions include:

• error_log(), which records error information to the system log file.
• trigger_error(), triggers a user-defined error message.
• set_error_handler(), custom error handling function.

2. Introducing the PHP error log function into the mini program

In the WeChat mini program, we can introduce the error log function into the PHP language. Error logging. The specific steps are as follows:

• Create error handling function

In PHP language, we can handle error information through custom functions. The following code is an example, where error_handling_function is the custom function name:

function error_handling_function($errno, $errmsg, $file, $line) {
    $log_file = 'error_log.log';
    $log_content = date('Y-m-d H:i:s')." -- ERROR $errno : $errmsg in $file:$line
";
    file_put_contents($log_file, $log_content, FILE_APPEND);
}

• Register error handling function

In PHP language, we can use the set_error_handler function to register custom Error handling function. The following code is an example:

set_error_handler('error_handling_function');

• Record error log

When an error occurs in the program, the error handling function in the PHP language will be automatically triggered. We can specify the log file and format to be used for error recording in the function, and then append the error log to the file to facilitate our viewing and analysis.

3. Error logging techniques

In order to facilitate viewing and analyzing error logs, we can use the following techniques:

1. Use timestamps to name log files

In order to easily distinguish different log files, we can use timestamps to name log files, such as error_log_20210801.log.

2. Split the log file

In order to avoid a log file being too large, we can split the error log file, such as generating a log file every day, or in the file Automatically split after reaching a certain size.

3. Use a readable log format

In order to facilitate viewing the log content, we can use a readable log format and add necessary comments and illustrate.

4. Summary

Through error logging, we can discover problems and repair them more timely and accurately during the development of WeChat mini programs to ensure the normal operation of the mini program. When using PHP language to develop WeChat applet, we can use a custom error handling function to record error information into a log file. At the same time, we can also use methods such as splitting log files and using highly readable log formats to facilitate our viewing and analysis of error logs.

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