error_log() function in PHP allows you to specify the error level using an optional parameter. You can choose from a range of predefined error levels to categorize your log message appropriately.
Here are the available error levels and their meanings:
E_ERROR: Critical errors that can’t be recovered from. These typically result in script termination.
E_WARNING: Non-fatal runtime errors. These won’t stop the script’s execution but should be addressed.
E_PARSE: Compile-time parse errors. These occur when PHP code is not correctly structured.
E_NOTICE: Non-fatal errors related to variables, such as using a variable that hasn’t been defined.
E_CORE_ERROR: Critical errors that occur during PHP’s startup sequence.
E_CORE_WARNING: Non-fatal errors that occur during PHP’s startup sequence.
E_COMPILE_ERROR: Critical compile-time errors.
E_COMPILE_WARNING: Non-fatal compile-time warnings.
E_USER_ERROR: User-generated error message. You can use this level to log custom errors in your code.
E_USER_WARNING: User-generated warning message.
E_USER_NOTICE: User-generated notice message.
E_STRICT: Notices that suggest changes in your code to ensure compatibility with future versions of PHP.
E_RECOVERABLE_ERROR: Catchable fatal errors.
E_DEPRECATED: Notices about deprecated features or functions.
E_USER_DEPRECATED: User-generated deprecated feature notice.
E_ALL: All errors and warnings, including runtime notices.
To specify the error level when using
error_log(), you pass it as the second argument, like this:
error_log("This is a custom error message.", 3); // Log as an error
In this example,
3 corresponds to
E_ERROR. You can replace it with any of the values mentioned above to categorize your log message appropriately based on the severity of the message or event you are logging.