What does this ~ operator mean here?

Question

Example:

set_error_handler(array($this, \'handleError\'), E_ALL & ~E_STRICT & ~E_WARNING & ~E_NOTICE);

what does that suppose t

Answer 1

It's the bitwise-not operator. For example the bitwise negation of a number with binary representation 01011110 would be 10100001; every single bit is flipped to its opposite.