E_CORE_ERROR

E_CORE_ERROR is one of the accepted parameters for error_reporting parameter #1 (optionally as a bitmask).

E_CORE_ERROR is one of the return values for error_reporting.

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_ERROR = 16;