PHP Manual states that E_CORE_ERROR are fatal errors that occur during PHP's initial startup:
This is like an E_ERROR, except it is generated by the core of PHP.
Also, it states that E_CORE_WARNING are warnings that occur during PHP's initial startup:
This is like an E_WARNING, except it is generated by the core of PHP.
How exactly does E_CORE_ERROR and E_CORE_WARNING occur?
Specifically, what will cause them?