note 17895 deleted from function.isset by jimw

I couldn't find a function which checks if a bit is set in a bit pattern / integer value. So I wrote one myself. function isbitset($myint, $mybit, $mybitsize) { $mystring = substr(str_repeat("0", $mybitsize) . decbin($myint), -$mybitsize, $mybitsize); $mysubstr = substr($mystring, $mybit, 1); return ($mysubstr || !$mysubstr == 0) ? true : false; } The function will return true if the bit in question is set, or false if it it isn't set. $myint ------ The integer value that you want to check its bits. $mybit ------ The bit number you want to check whether set or not, where $mybit = 0 means you are checking the msb, in other words the first bit from the left. $mybitsize ---------- The number of bits which the value $myint could consist of, when all bits would be set. For example, to test bit number 0 (msb) of a bitsize of 8 would result true, while the same test of bit number 0 of a bitsize of 16 would result false if $myint was 255. See for yourself whether useful and without bugs. I don't know if there's a better approach than this, just let me know. Greets, Jeroen.