1 E_ERROR Fatal run-time errors. Errors that can not be recovered from. Execution of the script is halted 2 E_WARNING Non-fatal run-time 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 an E_ERROR in the PHP core 32 E_CORE_WARNING Non-fatal errors at PHP startup. This is like an E_WARNING in the PHP core 64 E_COMPILE_ERROR Fatal compile-time errors. This is like an E_ERROR generated by the Zend Scripting Engine 128 E_COMPILE_WARNING Non-fatal compile-time errors. This is like an E_WARNING generated by the Zend Scripting Engine 256 E_USER_ERROR Fatal user-generated error. This is like an E_ERROR set by the programmer using the PHP function trigger_error() 512 E_USER_WARNING Non-fatal user-generated warning. This is like an E_WARNING set by the programmer using the PHP function trigger_error() 1024 E_USER_NOTICE User-generated notice. This is like an E_NOTICE set by the programmer using the PHP function trigger_error() 2048 E_STRICT Run-time notices. PHP suggest changes to your code to help interoperability and compatibility of the code 4096 E_RECOVERABLE_ERROR Catchable fatal error. This is like an E_ERROR but can be caught by a user defined handle (see also set_error_handler()) 8191 E_ALL All errors and warnings, except level E_STRICT (E_STRICT will be part of E_ALL as of PHP 6.0)