note 110973 added to function.hex2bin

For those who have php version prior to 5.4, i have a solution to convert hex to binary. Combining the comments from below. It works for me in an encryption and decryption application. function hextobin($hexstr) { $n = strlen($hexstr); $sbin=""; $i=0; while($i<$n) { $a =substr($hexstr,$i,2); $c = pack("H*",$a); if ($i==0){$sbin=$c;} else {$sbin.=$c;} $i+=2; } return $sbin; } ---- Server IP: 113.20.13.217 Probable Submitter: 120.20.195.49 ---- Manual Page -- http://php.net/manual/en/function.hex2bin.php Edit -- https://master.php.net/note/edit/110973 Del: integrated -- https://master.php.net/note/delete/110973/integrated Del: useless -- https://master.php.net/note/delete/110973/useless Del: bad code -- https://master.php.net/note/delete/110973/bad+code Del: spam -- https://master.php.net/note/delete/110973/spam Del: non-english -- https://master.php.net/note/delete/110973/non-english Del: in docs -- https://master.php.net/note/delete/110973/in+docs Del: other reasons-- https://master.php.net/note/delete/110973 Reject -- https://master.php.net/note/reject/110973 Search -- https://master.php.net/manage/user-notes.php