• On this page, you will find the functions to handle the errors that occur in the PHP script.
• These functions allow us to specify our own method to handle the errors and log them.
• Log functions allow us to redirect the logs/messages to other sources such as system logs or emails.
• We can specify the kind of feedback or error whenever the error occurs.

No installation is required for these functions. They are included in the core language.

Function	Description
debug_backtrace()	Generate a backtrace
debug_print_backtrace()	Output a backtrace
error_clear_last()	Clear the last error
error_get_last()	Get the last error that occurred
error_log()	Send error message to a log, to a file, or to a mail account
error_reporting()	Specify which errors are reported
restore_error_handler()	Restore the previous error handler
restore_exception_handler()	Restore the previous exception handler
set_error_handler()	Set user-defined error handler function
set_exception_handler()	Set user-defined exception handler function
trigger_error()	Create user-level error message
user_error()	Alias of trigger_error()

PHP Predefined Error and Logging Constants

Value	Constant	Description
1	E_ERROR	Fatal run-time errors. Errors that cannot be recovered from. Execution of the script is halted
2	E_WARNING	Run-time warnings (non-fatal errors). Execution of the script is not halted
4	E_PARSE	Compile-time parse errors. Parse errors should only be generated by the parser
8	E_NOTICE	Run-time notices. The script found something that might be an error, but could also happen when running a script normally
16	E_CORE_ERROR	Fatal errors at PHP startup. This is like E_ERROR, except it is generated by the core of PHP
32	E_CORE_WARNING	Non-fatal errors at PHP startup. This is like E_WARNING, except it is generated by the core of PHP
64	E_COMPILE_ERROR	Fatal compile-time errors. This is like E_ERROR, except it is generated by the Zend Scripting Engine
128	E_COMPILE_WARNING	Non-fatal compile-time errors. This is like E_WARNING, except it is generated by the Zend Scripting Engine
256	E_USER_ERROR	Fatal user-generated error. This is like E_ERROR, except it is generated in PHP code by using the PHP function trigger_error()
512	E_USER_WARNING	Non-fatal user-generated warning. This is like E_WARNING, except it is generated in PHP code by using the PHP function trigger_error()
1024	E_USER_NOTICE	User-generated notice. This is like E_NOTICE, except it is generated in PHP code by using the PHP function trigger_error()
2048	E_STRICT	Enable to have PHP suggest changes to your code which will ensure the best interoperability and forward compatibility of your code (Since PHP 5 but not included in E_ALL until PHP 5.4)
4096	E_RECOVERABLE_ERROR	Catchable fatal error. This indicates that a probably dangerous error occurred, but did not leave the Engine in an unstable state. If the error is not caught by a user-defined handle, the application aborts as it was an E_ERROR (Since PHP 5.2)
8192	E_DEPRECATED	Run-time notices. Enable this to receive warnings about code that will not work in future versions (Since PHP 5.3)
16384	E_USER_DEPRECATED	User-generated warning message. This is like E_DEPRECATED, except it is generated in PHP code by using the PHP function trigger_error() (Since PHP 5.3)
32767	E_ALL	Enable all PHP errors and warnings (except E_STRICT in versions < 5.4)