note 102125 added to language.types.float

Second function (HEX2FLOAT32n) converts Hexadecimal 8 digit strings to fixed decimals float numbers. (complementary to FLOAT2HEX32n above) <? /** Complementary functions to CONVERT PHP FLOATING POINT NUMBERS or DECIMALS * (IEEE 754 single-precision 32 bit) TO HEXADECIMAL AND BACK. * * @author NSTIAC (Jorge D. Baigorri Salas) <http://www.nstiac.com> <http://www.n2works.com> * @created on 28/Jan/2010 / time spent: 2hours approx. * @special thanks to Thomas Finley's article "Floating Point" * <http://tfinley.net/notes/cps104/floating.html> * * These functions allow to convert any php floating point numbers with the * notation 1.234 (or fixed point numbers) into their corresponding 8 digits * hexadecimal notation. (i.e.- 1557897.40 -> 49BE2C4B <- 1557897.40) by * disregarding their implicit format and treating them at will as either * integer, decimals, binary numbers, hexadecimal values, or plain text. * **/ /** HEX2FLOAT32n * (Convert 8 digit hexadecimal values to fixed decimals float numbers (single-precision 32bits) * Accepts 8 digit hexadecimal values on a string (i.e.- F1A9B02C) and single integer to fix number of decimals * @usage: * hex2float32n("c9be2c49",2); returns -> "-1557897.13" **/ function hex2float32n($number,$nd) { //Separate each hexadecimal digit for ($i=0; $i<strlen($number); $i++) { $hex[]=substr($number,$i,1); } //Convert each hexadecimal digit to integer for ($i=0; $i<count($hex); $i++) { $dec[]=hexdec($hex[$i]); } //Convert each decimal value to 4bit binary and join on a string for ($i=0; $i<count($dec); $i++) { $binfinal.=sprintf("%04d",decbin($dec[$i])); } //Get sign 1bit value $sign=substr($binfinal,0,1); //Get exponent 8bit value $exp=substr($binfinal,1,8); //Get mantissa 23bit value $mantissa=substr($binfinal,9); //Convert & adjunt binary exponent to integer $exp=bindec($exp); $exp-=127; //Assign mantissa to pre-scientific binary notation $scibin=$mantissa; //Split $scibin into integral & fraction parts through exponent $binint=substr($scibin,0,$exp); $binpoint=substr($scibin,$exp); //Convert integral binary part to decimal integer $intnumber=bindec("1".$binint); //Split each binary fractional digit for ($i=0; $i<strlen($binpoint); $i++) { $tmppoint[]=substr($binpoint,$i,1); } //Reverse order to work backwards $tmppoint=array_reverse($tmppoint); //Convert base 2 digits to decimal $tpointnumber=number_format($tmppoint[0]/2,strlen($binpoint),'.',''); for ($i=1; $i<strlen($binpoint); $i++) { $pointnumber=number_format($tpointnumber/2,strlen($binpoint),'.',''); $tpointnumber=$tmppoint[$i+1].substr($pointnumber,1); } //Join both decimal section to get final number $floatfinal=$intnumber+$pointnumber; //Convert to positive or negative based on binary sign bit if ($sign==1) { $floatfinal=-$floatfinal; } //Format float number to fixed decimals required return number_format($floatfinal,$nd,'.',''); } /** Using either function will return a value which can be used on the other function * to return the original input. (Hope it helps =) **/ ?> ---- Server IP: 69.147.83.197 Probable Submitter: 201.160.4.233 ---- Manual Page -- http://www.php.net/manual/en/language.types.float.php Edit -- https://master.php.net/note/edit/102125 Del: integrated -- https://master.php.net/note/delete/102125/integrated Del: useless -- https://master.php.net/note/delete/102125/useless Del: bad code -- https://master.php.net/note/delete/102125/bad+code Del: spam -- https://master.php.net/note/delete/102125/spam Del: non-english -- https://master.php.net/note/delete/102125/non-english Del: in docs -- https://master.php.net/note/delete/102125/in+docs Del: other reasons-- https://master.php.net/note/delete/102125 Reject -- https://master.php.net/note/reject/102125 Search -- https://master.php.net/manage/user-notes.php