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Not something you'd want to use every day, but sometimes you want to make sure that one specific line doesn't produce a "Notice" error in PHP. Well, it's not really an error, but anyhoo, you'd want to hide that line.
I had this while checking for bbPress being active or not:
$bbPress_Found = function_exists(is_bbpress); // either TRUE or FALSE
Which produces the notice message:
Notice: Use of undefined constant is_bbpress - assumed 'is_bbpress' in /path/to/offendingfile.php on line 26
To "hide" the message for just this single line, change the error level before and after the call;
$errorLevel = error_reporting(E_ALL & ~E_NOTICE); // disable E_NOTICE errors
$bbPress_Found = function_exists(is_bbpress); // offending line ...
error_reporting($errorLevel); // restore error level
Now in debug mode, it will not produce an "notice" for this specific line.
