I have an array:
Array
(
[red] => 252
[green] => 168
[blue] => 166
[alpha] => 0
)
It's an output of function imagecolorsforindex.
How can I get a HTML code from these elements? For example: #99CCFF
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4 Answers
Strictly speaking you can't, since alpha is not supported. But since the alpha is 0, we can assume that it won't matter. As such, pass each value into sprintf() with a format specifier of %02x for each element.
c = sprintf('#%02x%02x%02x', val['red'], val['green'], val['blue']);
answered Jun 16, 2011 at 8:44
Ignacio Vazquez-Abrams
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1 Comment
Yoshi
about alpha: See w3.org/TR/css3-color/#rgba-color with that:
color: rgba(0-255, 0-255, 0-255, 0-1); is no problem. And some browsers already interpret this correctly.
Comments
There's a function contributed in the comments of this page of the PHP manual.
<?PHP
function rgb2hex2rgb($c){
if(!$c) return false;
$c = trim($c);
$out = false;
if(preg_match("/^[0-9ABCDEFabcdef\#]+$/i", $c)){
$c = str_replace('#','', $c);
$l = strlen($c) == 3 ? 1 : (strlen($c) == 6 ? 2 : false);
if($l){
unset($out);
$out[0] = $out['r'] = $out['red'] = hexdec(substr($c, 0,1*$l));
$out[1] = $out['g'] = $out['green'] = hexdec(substr($c, 1*$l,1*$l));
$out[2] = $out['b'] = $out['blue'] = hexdec(substr($c, 2*$l,1*$l));
}else $out = false;
}elseif (preg_match("/^[0-9]+(,| |.)+[0-9]+(,| |.)+[0-9]+$/i", $c)){
$spr = str_replace(array(',',' ','.'), ':', $c);
$e = explode(":", $spr);
if(count($e) != 3) return false;
$out = '#';
for($i = 0; $i<3; $i++)
$e[$i] = dechex(($e[$i] <= 0)?0:(($e[$i] >= 255)?255:$e[$i]));
for($i = 0; $i<3; $i++)
$out .= ((strlen($e[$i]) < 2)?'0':'').$e[$i];
$out = strtoupper($out);
}else $out = false;
return $out;
}
?>
Output
#FFFFFF =>
Array{
red=>255,
green=>255,
blue=>255,
r=>255,
g=>255,
b=>255,
0=>255,
1=>255,
2=>255
}
#FFCCEE =>
Array{
red=>255,
green=>204,
blue=>238,
r=>255,
g=>204,
b=>238,
0=>255,
1=>204,
2=>238
}
CC22FF =>
Array{
red=>204,
green=>34,
blue=>255,
r=>204,
g=>34,
b=>255,
0=>204,
1=>34,
2=>255
}
0 65 255 => #0041FF
255.150.3 => #FF9603
100,100,250 => #6464FA
Comments
You can try this simple piece of code below.
$rgb = (123,222,132);
$rgbarr = explode(",",$rgb,3);
echo sprintf("#%02x%02x%02x", $rgbarr[0], $rgbarr[1], $rgbarr[2]);
This will return #7bde84
