note 109072 added to function.hexdec

Here is a more flexible version of the shexdec (signed hexdec) function, from an earlier comment. It has optional offset and length args to make working with long data strings easier & more optimized. With the older version you would have to extract the hex portion with substr and pass it to the function, which then might have run substr again to avoid the sign. This version can simply merge both substr steps into one, but it always runs substr. Also supports the '+' sign and checks empty strings to avoid a "Notice: Uninitialized string offset..." error message. <?php /* * $h : hex string * $o : optional offset, default 0 * $l : optional length, default 16 (16=64 bit int, 8=32bit int, no need to add 1 for sign) */ function shexdec($h,$o=0,$l=16) { if(!$h){return 0;} if($h[$o] === '-'){return -('0x'.substr($h,$o+1,$l)+0);} if($h[$o] === '+'){$o++;} return ('0x'.substr($h,$o,$l)+0); } var_dump(shexdec('')); // int(0) var_dump(shexdec('-7FFFFFFFFFFFFFFF')); // int(-9223372036854775807) var_dump(shexdec('+7FFFFFFFFFFFFFFF')); // int(9223372036854775807) var_dump(shexdec('7FFFFFFFFFFFFFFF')); // int(9223372036854775807) var_dump(shexdec('foo;-A2;bar;longstring...',4,2)); // int(-162) ?> ---- Server IP: 72.55.140.6 Probable Submitter: 69.159.196.196 ---- Manual Page -- http://www.php.net/manual/en/function.hexdec.php Edit -- https://master.php.net/note/edit/109072 Del: integrated -- https://master.php.net/note/delete/109072/integrated Del: useless -- https://master.php.net/note/delete/109072/useless Del: bad code -- https://master.php.net/note/delete/109072/bad+code Del: spam -- https://master.php.net/note/delete/109072/spam Del: non-english -- https://master.php.net/note/delete/109072/non-english Del: in docs -- https://master.php.net/note/delete/109072/in+docs Del: other reasons-- https://master.php.net/note/delete/109072 Reject -- https://master.php.net/note/reject/109072 Search -- https://master.php.net/manage/user-notes.php