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error-handlingphp-5.4

error_reporting bool operations

In https://stackoverflow.com/a/2867082/288568 I found two ways of disabling notices. So what exactly is the a difference between

error_reporting(E_ALL ^ E_NOTICE);

and

error_reporting(E_ALL & ~E_NOTICE);

?

And what does the following line do?

error_reporting((E_ALL | E_STRICT) ^ E_DEPRECATED  ^ E_NOTICE );

Would this correctly report E_ALL and E_STRICT but not DEPRECATED AND NOTICEs ?

Solution 
  • var_dump(error_reporting(E_ALL ^ E_NOTICE));
var_dump(error_reporting(E_ALL & ~E_NOTICE));

    is the same int(32759). Just different binary operations to get there.

    Would this correctly report E_ALL and E_STRICT but not DEPRECATED AND NOTICEs ?

    var_dump( decbin ((E_ALL | E_STRICT) ^ E_DEPRECATED  ^ E_NOTICE) );

    is 

    101111111110111

111111111111111 E_ALL
000100000000000 E_STRICT
000000000001000 E_NOTICE
010000000000000 E_DEPRECATED

    So the anwser is yes and (E_ALL ^ E_DEPRECATED ^ E_NOTICE) would be the same.