PHP provides an efficient way to work with PHP error logs, which you can log manually and automatically. Also, we have some third-party tools developed by the open source community to manage the PHP error logging process.
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The most important thing is when and how to raise errors. You can choose to log PHP errors when working in Dev mode, create a PHP error log file or save it as a notification in various channels, as you will have the benefit of logging errors according to your needs.
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This guide focuses on the basics of logs in PHP, their configuration, and where you can find them. Also, this guide details how logging can help you be more proactive when debugging and monitoring these PHP applications.
While working in production mode, you need to create a simple workflow to be able to log PHP errors so that users don’t face problems while running.
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PHP errors occur when there is something wrong in the code. It could be as simple as calling a variable incorrectly or missing a comma. You need to understand the types of errors you will encounter in order to fix them effectively.
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PHP errors warn of problems that may cause more serious errors in the long run. Warning errors do not break code execution and usually occur when using a file path that does not exist.
For example, if this error appears, you must check the code name or file name in the directory, because the script cannot find it because of a syntax error.
There is no file named “external_file”, so the output will show an error message box, and the execution will not break.
Note that the error is small; Unlike warning errors, they do not stop code execution. Errors often occur when scripts need to access unknown variables
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Grammar errors are often caused by parsing, misused, or missing symbols. When the compiler catches the error, it stops the script.
A fatal error occurs when the code calls a function, but the function itself is not defined. Like other PHP errors, serious errors cause performance degradation and sometimes crash the application. There are three types of serious errors:
PHP is the most widely used programming language for developing web applications. According to Built With Insights, almost all websites today use PHP as their backend language, making it 75% of all websites in the world. These statistics clearly show that PHP has a solid market share in the programming world. When you start developing an application in PHP, you use some commands like:
To debug and log into the browser, but, it is not the most secure way when working in production mode. In Dev mode, you can do it, but you have to turn it off when starting the migration. So, in dev mode, you can easily log errors in PHP.
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Function, which sends an error message to the default error handler. Suppose you are connecting to a MySQL database with PHP and if it fails to connect to it, you can log the error in PHP like this:
If you want to enable PHP errors in individual files, add this code to the top of the PHP file
Now, you can easily see the errors logged in your browser. Some additional commands you can write for logging PHP errors include:
When this is enabled, you can check the PHP error log. In most cases, it is disabled by default. Therefore, before making any changes to the code and configuration, check the PHP information to make sure that PHP logging is enabled in your account.
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You can enable PHP error logging by editing the .htaccess file. Find the .htaccess file in the root directory of the website using a file manager or FTP client. However, if the file is hidden, go to the settings of the control panel or FTP client to show hidden files.
Now that PHP error logging is enabled, check again using PHP Info, and the local value should be running. Don’t worry if the original value is still off, because the local value will overwrite it.
A third way to enable PHP debugging is to edit the php.ini file. It contains the default web server settings for running PHP applications
You can find the php.ini file by accessing the PHP information when you open it, press CTRL + F for Windows or Command + F for macOS to open the search bar and look for the Loaded Configuration Files section.
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The actions defined above work well when working in a Dev environment but, when you go live with your website and start working in production mode, you have to hide the errors from the display on the screen and into the backend files.
You can save it in the PHP error log with the URL described earlier. in the php.ini file
PHP logs errors in /var/log/apache2, if it uses the apache2 module. Shared hosts tend to store PHP error log files in your home log subfolder/subfolder but… if you have access to the php.ini file you can do this:
If you are using cPanel, the original log files, which you may find, are (by default) stored in:
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The steps I described above are for basic PHP development. PHP has a variety of Model View (MVC) architectures and micro-frameworks that have their own methods on top of the core functions. Some of the best PHP MVC frameworks for building advanced web applications include Laravel, Code Igniter, and Symphony.
When you set up a new Laravel project, error logging and exception handling are preconfigured. Laravel has a separate AppExceptionHandler class that takes care of all these things. For Laravel error logging, it uses the Monologue library that supports various log handlers. Laravel defines many of these controls for you, giving you the choice between writing error information to a single PHP error log file, a rotation log file, and a system log.
In the configuration/app.php file, you can configure PHP options to log user display errors. The value of this option can be set under APP_DEBUG in the .env file which is an environment variable, therefore located in the app.php file. When developing locally, the value can be set to true and must be set to false after moving to production. Otherwise, there is always a security concern because it will show an error on the browser screen
You, as a developer, can save Laravel log data to file, log file, syslog and airlog. To set these options for Laravel error logging, you need to open the app.php file and edit the logging options. For example, if you want to set up daily logging for errors, you would do the following:
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Monologue may log errors with various security warnings. By default, it will add all errors to the archive, but you can mark them as Error, Emergency, Caution, Important and Warning. To do this, add the ‘log_level’ property to the option like this:
Symfony comes with a default logger that you can inject into the controller by displaying different warning levels. By default, log entries are written to the var/log/dev.log file when you
Since Symfony is the main framework of Laravel, the warning level of the framework is the same.
Symfony uses monolog for error logging and pre-configures some basic handlers in monolog.yaml by default. Below is an example that uses syslogs to write logs to file:
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You can do all the tasks of logging errors manually, but when you are working in many teams and large projects, you need to set up an automatic task that can log errors with third-party services such as Sentry, Slack, Blackfire, etc.
These tools can give you a better understanding of errors and their solutions. You can also set up a Slack channel to send quick notifications to the team about pending incidents.
Emojis are also set in the example above, do you see? 😀 This shows that you can send Slack notifications to any channel according to your needs.
When you create an account on a web hosting for PHP and launch a PHP server with an application, you can see a log folder in the root system that takes care of the server’s logs. You can find both Apache and Nginx logs there, which allows you to identify possible error logs. Because users are not allowed to edit the php.ini file (you can ask a live support agent to do that for you); But if you look carefully at the PHP server settings, you can customize the error_reporting settings and most logs in the platform.
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Of course, you can also access PHP-FPM where you can add
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