PHP Error Levels

# PHP Error Levels

There are sixteen different error levels (i.e. types) are available in PHP.

## Error Levels in PHP

Usually, whenever the PHP engine encounters a problem that prevents a script from running properly it generate an error message. There are sixteen different error levels and each level is represented by an integer value and an associated constant. Here’s a list of error levels:

| Error Level           | Value | Description                                                                                                                                                                                                                                        |
| --------------------- | ----- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| E\_ERROR              | 1     | A fatal run-time error, that can’t be recovered from. The execution of the script is stopped immediately.                                                                                                                                         |
| E\_WARNING            | 2     | A run-time warning. It is non-fatal and most errors tend to fall into this category. The execution of the script is not stopped.                                                                                                                   |
| E\_PARSE              | 4     | The compile-time parse error. Parse errors should only be generated by the parser.                                                                                                                                                                 |
| E\_NOTICE             | 8     | A run-time notice indicating that the script encountered something that could possibly an error, although the situation could also occur when running a script normally.                                                                           |
| E\_CORE\_ERROR        | 16    | A fatal error that occur during the PHP’s engine initial startup. This is like an E\_ERROR, except it is generated by the core of PHP.                                                                                                            |
| E\_CORE\_WARNING      | 32    | A non-fatal error that occur during the PHP’s engine initial startup. This is like an E\_WARNING, except it is generated by the core of PHP.                                                                                                      |
| E\_COMPILE\_ERROR     | 64    | A fatal error that occur while the script was being compiled. This is like an E\_ERROR, except it is generated by the Zend Scripting Engine.                                                                                                       |
| E\_COMPILE\_WARNING   | 128   | A non-fatal error occur while the script was being compiled. This is like an E\_WARNING, except it is generated by the Zend Scripting Engine.                                                                                                      |
| E\_USER\_ERROR        | 256   | A fatal user-generated error message. This is like an E\_ERROR, except it is generated by the PHP code using the function trigger\_error() rather than the PHP engine.                                                                             |
| E\_USER\_WARNING      | 512   | A non-fatal user-generated warning message. This is like an E\_WARNING, except it is generated by the PHP code using the function trigger\_error() rather than the PHP engine                                                                      |
| E\_USER\_NOTICE       | 1024  | A user-generated notice message. This is like an E\_NOTICE, except it is generated by the PHP code using the function trigger\_error() rather than the PHP engine.                                                                                 |
| E\_STRICT             | 2048  | Not strictly an error, but triggered whenever PHP encounters code that could lead to problems or forward incompatibilities                                                                                                                         |
| E\_RECOVERABLE\_ERROR | 4096  | A catchable fatal error. Although the error was fatal, it did not leave the PHP engine in an unstable state. If the error is not caught by a user defined error handler (see set\_error\_handler()), the application aborts as it was an E\_ERROR. |
| E\_DEPRECATED         | 8192  | A run-time notice indicating that the code will not work in future versions of PHP                                                                                                                                                                 |
| E\_USER\_DEPRECATED   | 16384 | A user-generated warning message. This is like an E\_DEPRECATED, except it is generated by the PHP code using the function trigger\_error() rather than the PHP engine.                                                                            |
| E\_ALL                | 32767 | All errors and warnings, except of level E\_STRICT prior to PHP 5.4.0.                                                                                                                                                                             |

Last modification：September 15, 2024