PHP | Error Levels
Usually, whenever the PHP engine encounters a problem that prevents a script from running properly it generates 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
E_ERROR (Value:- 1)
A fatal run-time error, that can’t be recovered from. The execution of the script is stopped immediately.
E_WARNING (Value:- 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 (Value:- 4)
The compile-time parse error. Parse errors should only be generated by the parser.
E_NOTICE (Value:- 8)
A run-time notice indicates that the script encountered something that could be an error, although the situation could also occur when running a script normally.
E_CORE_ERROR (Value:- 16)
A fatal error occurs 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 (Value:- 32)
A non-fatal error occurs 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 (Value:- 64)
A fatal error that occurs while the script was being compiled. This is like an E_ERROR, except it is generated by the Zend Scripting Engine.
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E_COMPILE_WARNING (Value:- 128)
A non-fatal error occurs while the script was being compiled. This is like an E_WARNING, except it is generated by the Zend Scripting Engine.
E_USER_ERROR (Value:- 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 (Value:- 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 (Value:- 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 (Value:- 2048)
Not strictly an error, but triggered whenever PHP encounters code that could lead to problems or forward incompatibilities
E_RECOVERABLE_ERROR (Value:- 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 (Value:- 8192)
A run-time notice indicating that the code will not work in future versions of PHP
E_USER_DEPRECATED (Value:- 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 (Value:- 32767)
All errors and warnings, except level E_STRICT before PHP 5.4.0.
