dechex

Be very careful calling dechex on a number if it's stored in a string.For instance:The max number it can handle is 4294967295 which in hex is FFFFFFFF, as it says in the documentation.dechex(4294967295) => FFFFFFFF //CORRECTBUT, if you call it on a string of a number, it casts to int, and automatically gives you the largest int it can handle.dechex('4294967295') => 7FFFFFFF //WRONG!so you'll need to cast to a float:dechex((float) '4294967295') => FFFFFFFF //CORRECTThis took me FOREVER to figure out, so hopefully I just saved someone some time.

Here are two functions that will convert large dec numbers to hex and vice versa. And I really mean LARGE, much larger than any function posted earlier.<pre>// Input: A decimal number as a String.// Output: The equivalent hexadecimal number as a String.function dec2hex($number){    $hexvalues = array('0','1','2','3','4','5','6','7',               '8','9','A','B','C','D','E','F');    $hexval = '';     while($number != '0')     {        $hexval = $hexvalues[bcmod($number,'16')].$hexval;        $number = bcdiv($number,'16',0);    }    return $hexval;}// Input: A hexadecimal number as a String.// Output: The equivalent decimal number as a String.function hex2dec($number){    $decvalues = array('0' => '0', '1' => '1', '2' => '2',               '3' => '3', '4' => '4', '5' => '5',               '6' => '6', '7' => '7', '8' => '8',               '9' => '9', 'A' => '10', 'B' => '11',               'C' => '12', 'D' => '13', 'E' => '14',               'F' => '15');    $decval = '0';    $number = strrev($number);    for($i = 0; $i < strlen($number); $i++)    {        $decval = bcadd(bcmul(bcpow('16',$i,0),$decvalues[$number{$i}]), $decval);    }    return $decval;}</pre>

A less elegant but (perhaps) faster way to pad is with substr with a negative length argument. I use it in this tiny function which formats computed rgb color codes for style sheets:<?function toColor($n){return("#".substr("000000".dechex($n),-6));}?>

Easiest :P way to create random hex color:<?phpfunction rand_color() {    return substr('00000' . dechex(mt_rand(0, 0xffffff)), -6);}?>

If you need to generate random HEX-color, use this:<?phpfunction random_hex_color(){    return sprintf("%02X%02X%02X", mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));}$hex = random_hex_color(); // 09B826?>Enjoy.

this base function convert string rgb to color<?php    function rgb_to_color($rgb, $symbols=' '){        $color = '';        $arr = explode($symbols, $rgb);        $count = count($arr);        for($i=0; $i<$count; $i++){            $color .= dechex($arr[$i]);        }        return '#'.$color;    }       echo rgb_to_color('186 186 18');  // #baba12    echo rgb_to_color('186-186-18', '-');  // #baba12?>

If you want to create or parse signed Hex values:<?php// $d should be an intfunction sdechex($d) { return ($d<0) ? ('-' . dechex(-$d)) : dechex($d); }// $h should be a stringfunction shexdec($h) { return ($h[0] === '-') ? -('0x' . substr($h,1) + 0) : ('0x' . $h + 0); }// test$v = sdechex(-123); // string(3) "-7b"$i = shexdec($v);   // int(-123)var_dump($v, $i);?>Also note that ('0x' . $str + 0) is faster than hexdec()

These are functions to convert roman numbers (e.g. MXC) into dec and vice versa.Note: romdec() does not check whether a string is really roman or not. To force a user-input into a real roman number use decrom(romdec($input)). This will turn XXXX into XL for example.<?php    function decrom($dec){        $digits=array(            1 => "I",            4 => "IV",            5 => "V",            9 => "IX",            10 => "X",            40 => "XL",            50 => "L",            90 => "XC",            100 => "C",            400 => "CD",            500 => "D",            900 => "CM",            1000 => "M"        );        krsort($digits);        $retval="";        foreach($digits as $key => $value){            while($dec>=$key){                $dec-=$key;                $retval.=$value;            }        }        return $retval;    }    function romdec($rom){        $digits=array(            "I" => 1,            "V" => 5,            "X" => 10,            "L" => 50,            "C" => 100,            "D" => 500,            "M" => 1000        );        $retval="";        $chars=array();        for($i=1;$i<=strlen($rom);$i++){            $chars[]=substr($rom,$i-1,1);        }        $step=1;        for($i=count($chars)-1;$i>=0;$i--){            if(!isset($digits[$chars[$i]])){ return "Error!"; }            if($step<=$digits[$chars[$i]]){                $step=$digits[$chars[$i]];                $retval+=$digits[$chars[$i]];            }            else{                $retval-=$digits[$chars[$i]];            }        }        return $retval;    }    echo decrom(romdec("XXXX"));?>

Here is a very small zeropadding that you can use for numbers:function zeropad($num, $lim){   return (strlen($num) >= $lim) ? $num : zeropad("0" . $num);}zeropad("234",6);will produce:000234zeropad("234",1);will produce:234

Here's how to use bitwise operations for RGB2hex conversion. This function returns hexadesimal rgb value just like one submitted by gurke@bigfoot.com above.function hexColor($color) {  return dechex(($color[0]<<16)|($color[1]<<8)|$color[2]);}example:$col[0] = 25;$col[1] = 255;$col[2] = 55;print hexColor($col);

I was confused by dechex's size limitation. Here is my solution to the problem. It supports much bigger values, as well as signs.

<?php
function dec_to_hex($dec)
{
    $sign = ""; // suppress errors
    if( $dec < 0){ $sign = "-"; $dec = abs($dec); }

    $hex = Array( 0 => 0, 1 => 1, 2 => 2, 3 => 3, 4 => 4, 5 => 5,
                  6 => 6, 7 => 7, 8 => 8, 9 => 9, 10 => 'a',
                  11 => 'b', 12 => 'c', 13 => 'd', 14 => 'e',    
                  15 => 'f' );
        
    do
    {
        $h = $hex[($dec%16)] . $h;
        $dec /= 16;
    }
    while( $dec >= 1 );
    
    return $sign . $h;
}
?>

I like the example with the bitwise operations but if the value of color[0] is less than 16 it's not accurate:example:color[0]: 0;color[1]: 0;color[2]: 255; function hexColor($color) {  return dechex(($color[0]<<16)|($color[1]<<8)|$color[2]);}It returns "ff", which is not legit RGB color...so my solution is to combine the function above with: function toColor($n){return("#".substr("000000".dechex($n),-6));}If you gotta deal with array of rgb values this is my solution:------------------------------------------------------function hexColor($color) {    $rgb = dechex(($color[0]<<16)|($color[1]<<8)|$color[2]);    return("#".substr("000000".$rgb, -6));}------------------------------------------------------

Create Random Hex Color:function make_seed() {    list($usec, $sec) = explode(' ', microtime());    return (float) $sec + ((double) $usec * 100000); } function rand_hex() {   mt_srand(make_seed());    $randval = mt_rand(0,255);   //convert to hex   return sprintf("%02X",$randval);}function random_color(){   return "#".rand_hex().rand_hex().rand_hex();}hme ;)

If you need to convert a large number (> PHP_MAX_INT) to a hex value, simply use base_convert. For example:base_convert('2190964402', 10, 16); // 829776b2

I was challenged by a problem with large number calculations and conversion to hex within php. The calculation exceeded unsigned integer and even float range. You can easily change it for your needs but it is, thanks to bcmath, capable of handling big numbers via string. This function will convert them to hex.

In this specific example though, since I use it for game internals that can only handle 32 bit numbers, it will truncate calculations at 8 digits. If the input is 1 for example it will be filled up with zeros. Output 00000001h.

Of course I don't claim it to be a good one, but it works for me and my purpose. Suggestions on faster code welcome!

<?php
// Turns numbers into 32-bit hex string; Fills up zeros
function lrgDec2Hex($number)
{
    $i = 0;
    $hex = array();

    while($i < 8) {
        if($number == 0) {
            array_push($hex, '0');
        }
        else {
            array_push($hex, strtoupper(dechex(bcmod($number, '16'))));
            $number = bcdiv($number, '16', 0);
        }
        $i++;
    }
    krsort($hex);
    return implode($hex);
}
?>

If you need to convert RGB-color into HEX-color, use this:<?phpfunction rgb2hex($rgb){    return sprintf("%06X", $rgb);}$hex = rgb2hex(65280); // 00FF00?>

Zero padded hex strings as a pair of 2 (8bit).<?php function dec2hex($int) {  $hex = dechex($int);  if (strlen($hex)%2 != 0) {    $hex = str_pad($hex, strlen($hex) + 1, '0', STR_PAD_LEFT);  }  return $hex;}dec2hex(2); // 02dec2hex(10); // 0adec2hex(256); // 0100?>