This PHP code will convert Decimal to Hexadecimal value

function d2hconvert($decimal){
return dechex($decimal);
}
$decimal=1000;
echo $decimal." equivalent Hexadecimal value is ".d2hconvert($decimal);
?>

Similarly for hexdec(),hexoct() and hexbin()
To convert Decimal to Binary use
dechex(hexbin($input));
We can also use this Decimal to Hex Converter

Read more: http://feeds.dzone.com/~r/dzone/snippets/~3/SxWRJa36kos/13533