Types Of Errors
There are a number of different error types that may be triggered in PHP. Some of these can be recovered from, while others cannot (that is, some errors will cause the current script execution to immediately halt).
The following list is from the PHP manual entry on Error Predefined Constants.
- E_ERROR: Fatal run-time errors. These indicate errors that can not be recovered from, such as a memory allocation problem. Execution of the script is halted
- E_WARNING: Run-time warnings (non-fatal errors). Execution of the script is not halted
- E_PARSE: Compile-time parse errors. Parse errors should only be generated by the parser.
- E_NOTICE: Run-time notices. Indicate that the script encountered something that could indicate an error, but could also happen in the normal course of running a script.
- E_CORE_ERROR: Fatal errors that occur during PHP's initial startup. This is like an E_ERROR, except it is generated by the core of PHP.
- E_CORE_WARNING: Warnings (non-fatal errors) that occur during PHP's initial startup. This is like an E_WARNING, except it is generated by the core of PHP.
- E_COMPILE_ERROR: Fatal compile-time errors. This is like an E_ERROR, except it is generated by the Zend Scripting Engine
- E_COMPILE_WARNING: Compile-time warnings (non-fatal errors). This is like an E_WARNING, except it is generated by the Zend Scripting Engine
- E_USER_ERROR: User-generated error message. This is like an E_ERROR, except it is generated in PHP code by using the PHP function trigger_error()
- E_USER_WARNING: User-generated warning message. This is like an E_WARNING, except it is generated in PHP code by using the PHP function trigger_error()
- E_USER_NOTICE: User-generated notice message. This is like an E_NOTICE, except it is generated in PHP code by using the PHP function trigger_error()
- E_STRICT: Enable to have PHP suggest changes to your code which will ensure the best interoperability and forward compatibility of your code
- E_RECOVERABLE_ERROR: Catchable fatal error. It indicates that a probably dangerous error occured, but did not leave the Engine in an unstable state. If the error is not caught by a user defined handle (see also set_error_handler()), the application aborts as it was an E_ERROR
- E_DEPRECATED: Run-time notices. Enable this to receive warnings about code that will not work in future versions
- E_USER_DEPRECATED: User-generated warning message. This is like an E_DEPRECATED, except it is generated in PHP code by using the PHP function trigger_error()
When you want to refer to all error levels easily, you can use E_ALL. This includes all errors and warnings, except for E_STRICT.
