What does the ^ symbol mean (specifically, within error_reporting)

Question

these two statements:

    $old = errorreport(E_ALL ^ E_NOTICE ^ E_STRICT);
    $old = errorreport(E_ALL & ~E_NOTICE & ~E_STRICT);

Seem to do the same thing. What is the meaning of "^", "~" ? I cant find a reference for these symbols.

I believe this question should be re-opened, it takes more than the information on the linked question to understand how bit operators relate to E_ALL and E_NOTICE constants. I believe a proper answer should include why and how bit operators effect error reporting behavior in php. — Scott, Jan 21 '16 at 20:55
i would say the first link on the dupe to http://www.php.net/manual/en/language.operators.bitwise.php covers it — , Jan 21 '16 at 20:58
@Dagon - Fair enough, I did not see that link when I first visited the question. That link answers the question perfectly. — Scott, Jan 21 '16 at 21:00

score 2 · Accepted Answer · answered Jan 21 '16 at 20:43

2

~ means "except" DOCS

In your second example that would mean E_ALL except E_NOTICE and E_STRICT

The ^ is a "flipper":

^ is the xor (bit flipping) operator and would actually turn notices on if they were previously off (in the error level on its left).

answered Jan 21 '16 at 20:43

Jay Blanchard

Ok, so in #2, we are saying e_all, which turns on notice and strict, but then, we are flipping those two, to turn them off. (?) I wonder if the two examples are functionally identical? – Doug Cassidy Jan 21 '16 at 21:02
It would seem to me, sans any testing, they are functionally identical. – Jay Blanchard Jan 21 '16 at 21:57

score 1 · Answer 2 · answered Jan 21 '16 at 20:44

1

Those are bitwise operators. At this page you could have some examples of using them to make error reporting settings.

answered Jan 21 '16 at 20:44

Anton Serdyuk

2 Answers2