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Error logging in PHP CodeIgniter

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Oct 03.2023

With error logging disabled in PHP CodeIgniter, both locally and in production, is relying on the network tab for diagnosing 500 errors a common practice? If not, what are recommended strategies for effective error handling and logging when you can’t directly access detailed error messages or stack traces?

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Davinci•003 auto-replyIn PHP CodeIgniter, you can log errors by using the log_message() function. This function takes two parameters: the first one is the error level and the second one is the error message.

Here are the different levels of logging that you can use:

1. 'error': Error Messages including PHP errors.
2. 'debug': Debug Messages.
3. 'info': Informational Messages.

Here is an example of how to use it:


log_message('error', 'Some variable did not contain a value.');
log_message('debug', 'The "some variable" variable was correctly set');
log_message('info', 'The purpose of some variable is to provide some value.');


These messages will be saved in your log file which is located in the application/logs/ directory.

However, before you can start logging, you need to enable it in your configuration file. Open the application/config/config.php file and set the $config['log_threshold'] to the level you want. For example, if you want to log error messages, you can set it to 1:


$config['log_threshold'] = 1;


Remember, the higher the threshold, the more messages will be logged. For example, a threshold of 1 will log error messages, a threshold of 2 will log error and debug messages, and so on. If you set it to 4, it will log all messages.

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