note 80634 added to language.operators.bitwise

There are some great notes here, but some of them are not as stellar as others. Take a look at the date they were posted and and replies to them before using them in anything but the most trivial cases. For example, any function which uses implicit string to integer casting to evaluate hexadecimal. This is bad code: <?php $integer_a = 41762; $integer_b = (0+('0x'.dechex($integer_a << 1))); ?> This is better [but still bad] code: <?php $integer_a = 41762; $integer_b = intval(dechex($integer_a << 1), 16); ?> This is probably optimal: <?php $integer_a = 41762; $integer_b = (int)$integer_a << 1; // explicit cast ?> Also, don't re-invent the wheel. This function is unreadable, [needlessly] recursive, and superfluous: <?php function binString($var, $safety = 0) { return ($var & 1) . ($var != 0 && $safety < 31 ? binString($var >> 1, $safety+1) : ""); } print(binString(41762)); ?> This code does the same thing, and it's built-in: <?php printf('%b', 41792); // you'd do well to learn about printf() ?> As always, if there are six ways to do it in C, there are 50 ways to do it in PHP. No method is wrong as long as it produces the correct result, but only a few methods will upgrade reliably, be portable, and be readable. ---- Server IP: 209.41.74.194 Probable Submitter: 70.91.178.185 ---- Manual Page -- http://www.php.net/manual/en/language.operators.bitwise.php Edit -- https://master.php.net/note/edit/80634 Del: integrated -- https://master.php.net/note/delete/80634/integrated Del: useless -- https://master.php.net/note/delete/80634/useless Del: bad code -- https://master.php.net/note/delete/80634/bad+code Del: spam -- https://master.php.net/note/delete/80634/spam Del: non-english -- https://master.php.net/note/delete/80634/non-english Del: in docs -- https://master.php.net/note/delete/80634/in+docs Del: other reasons-- https://master.php.net/note/delete/80634 Reject -- https://master.php.net/note/reject/80634 Search -- https://master.php.net/manage/user-notes.php