Simple discussion on PHP custom error log _php technique

Usually read the error log PHP, very few opportunities to write their own log, saw Wang Jian's "Best log Practice" that write a clear, structured log is still very necessary.

Before writing a journal, we ask ourselves: why do we sometimes have to record our own custom logs? Without the system default logging mode?

I think there are two reasons:

1. The team needs a unified form of log to facilitate management

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

So, practice.

1. Open your php.ini.

2. Open the log record to

Copy Code code as follows:

Log_errors = Off

Change into

Copy Code code as follows:

Log_errors = On

3. Save PHP.ini Exit and restart the Web server

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

Copy Code code as follows:

<?php
Error-handling functions
function MyErrorHandler ($errno, $errstr, $errfile, $errline)
{
$log _file = "./php_%s_log_". Date ("Ymd"). ". Log "//" to define the directory and file name
$template = ';
Switch ($errno) {
Case E_USER_ERROR:
$template. = "User error level errors, must fix the error number [$errno] $errstr";
$template. = "Error location file $errfile, $errline row \ n";
$log _file = sprintf ($log _file, ' error ');
Exit (1);//System exit
Break
Case e_user_warning:
$template. = "User warning level error, recommended fix error number [$errno] $errstr";
$template. = "Error location file $errfile, $errline row \ n";
$log _file = sprintf ($log _file, ' warning ');
Break
Case E_user_notice:
$template. = "User notice level error, does not affect the system, does not fix the error number [$errno] $errstr";
$template. = "Error location file $errfile, $errline row \ n";
$log _file = sprintf ($log _file, ' notice ');
Break
Default
$template. = "Unknown error type: error number [$errno] $errstr";
$template. = "Error location file $errfile, $errline row \ n";
$log _file = sprintf ($log _file, ' unknown ');
Break
}
File_put_contents ($log _file, $template, file_append);
return true;
}
$error _handler = Set_error_handler ("MyErrorHandler");//Open Custom error log

5. Try writing the next error code after just the code

Echo 1/0;

See if you have one more log file under the path you've defined? :)

Note: The following level 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 in the call to set_ Most e_strict generated in the file where the Error_Handler () function resides.

However, when you turn on the error log system (Log_error = on in php.ini) and specify the system log file (which is also the error_log= pathname in php.ini), and the error_reporting is all open, The above errors are recorded in the file you defined as the system error log.

This is the entire content described in this article, I hope you can have a new understanding of PHP custom error log.