A brief discussion on PHP custom error log_PHP tutorial

A brief discussion on PHP custom error logs

I often read PHP error logs, but rarely have the opportunity to write logs myself. I read Wang Jian's "Best Logging Practices" 》I think it is very necessary to write a clear and well-structured log.

Before writing logs, we ask ourselves: Why do we sometimes need to record customized logs? Instead of using the system’s default logging method?

I think there are two reasons:

1. The team needs a log in a unified format for easy management

2. A large number of useless error logs occupy hard disk space, only meaningful logs need to be recorded.

Then, practice it.

1. Open your php.ini

2. Turn on logging and change

The code is as follows:

log_errors = Off

Changed to

The code is as follows:

log_errors = On

3. Save php.ini, exit and restart the web server

4. Add the following code at the beginning of your code

The code is as follows:

// Error handling function

Function myErrorHandler($errno, $errstr, $errfile, $errline)

　{

　$log_file = "./php_%s_log_".date("Ymd").".log";//Define the log file storage directory and file name

$template = '';

switch ($errno) {

case E_USER_ERROR:

　$template .= "User ERROR level error, must be repaired. Error number [$errno] $errstr ";

　$template .= "Error location file $errfile, line $errline n";

　$log_file = sprintf($log_file,'error');

exit(1);//System exit

break;

case E_USER_WARNING:

　$template .= "User WARNING level error, it is recommended to fix the error number [$errno] $errstr ";

　$template .= "Error location file $errfile, line $errline n";

　$log_file = sprintf($log_file,'warning');

break;

case E_USER_NOTICE:

　$template .= "User NOTICE level error, does not affect the system, does not need to be repaired. Error number [$errno] $errstr ";

　$template .= "Error location file $errfile, line $errline n";

　$log_file = sprintf($log_file,'notice');

break;

default:

　$template .= "Unknown error type: Error number [$errno] $errstr ";

　$template .= "Error location file $errfile, line $errline n";

$log_file = sprintf($log_file,'unknown');

break;

　}

file_put_contents($log_file,$template,FILE_APPEND);

return true;

　}

$error_handler = set_error_handler("myErrorHandler");//Enable custom error log

5. Try writing an error code after the previous code

echo 1/0;

See if there is an extra log file under the path you defined? :)

NOTE: The following levels of errors cannot be handled by user-defined functions: E_ERROR, E_PARSE, E_CORE_ERROR, E_CORE_WARNING, E_COMPILE_ERROR, E_COMPILE_WARNING, and most E_STRICTs generated in the file where the set_error_handler() function is called.

However, when you enable the error logging system (log_error = on in php.ini) and specify the system log file (also error_log=path name in php.ini), and error_reporting is turned on, the above Errors will be recorded as system error logs in the file you define.

The above is all the content described in this article. I hope everyone can have a new understanding of PHP custom error logs.

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