Convert RGB to hex color values in PHP

Question

in my code i have

$color = rgb(255, 255, 255);

i want to convert this into hex color code.Out put like

$color = '#ffffff';

This will do it [conversion function](https://stackoverflow.com/questions/3623176/php-allocate-color-without-image-resource/55274609#55274609) — Eric Shoberg, Mar 22 '19 at 14:26

score 8 · Answer 1 · answered Oct 06 '15 at 05:58

You can use following function

function fromRGB($R, $G, $B)
{

    $R = dechex($R);
    if (strlen($R)<2)
    $R = '0'.$R;

    $G = dechex($G);
    if (strlen($G)<2)
    $G = '0'.$G;

    $B = dechex($B);
    if (strlen($B)<2)
    $B = '0'.$B;

    return '#' . $R . $G . $B;
}

Then, echo fromRGB(115,25,190); will print #7319be

Source: RGB to hex colors and hex colors to RGB - PHP

IAmMilinPatel · Answer 2 · 2017-06-03T07:41:12.017

8

You can try this simple piece of code below. You can pass the rgb code dynamically as well in the code.

$rgb = (123,222,132);
$rgbarr = explode(",",$rgb,3);
echo sprintf("#%02x%02x%02x", $rgbarr[0], $rgbarr[1], $rgbarr[2]);

This will code return like #7bde84

edited Jun 03 '17 at 07:41

answered Nov 23 '16 at 09:52

IAmMilinPatel

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4

First line of code looks wrong, is this meant as an array or did you forget the "rgb" function name? – donquixote Nov 02 '17 at 02:31
It's an array. Worked out really well for me, so I didn't find anything wrong with it. – IAmMilinPatel Nov 02 '17 at 02:51
Yes. Well I'm not much of an expert of PHP, but the above code did the trick for me in this case! I thought it might also help others so put it here... – IAmMilinPatel Nov 02 '17 at 03:00

score 6 · Answer 3 · answered Nov 13 '19 at 15:36

Here is a function that will accept the string version of either an rgb or rgba and return the hex color.

    function rgb_to_hex( string $rgba ) : string {
        if ( strpos( $rgba, '#' ) === 0 ) {
            return $rgba;
        }

        preg_match( '/^rgba?[\s+]?\([\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?/i', $rgba, $by_color );

        return sprintf( '#%02x%02x%02x', $by_color[1], $by_color[2], $by_color[3] );
    }

Example: rgb_to_hex( 'rgba(203, 86, 153, 0.8)' ); // Returns #cb5699

score 0 · Answer 4 · answered Oct 06 '15 at 05:56

You can try this

function rgb2html($r, $g=-1, $b=-1)
{
    if (is_array($r) && sizeof($r) == 3)
        list($r, $g, $b) = $r;

    $r = intval($r); $g = intval($g);
    $b = intval($b);

    $r = dechex($r<0?0:($r>255?255:$r));
    $g = dechex($g<0?0:($g>255?255:$g));
    $b = dechex($b<0?0:($b>255?255:$b));

    $color = (strlen($r) < 2?'0':'').$r;
    $color .= (strlen($g) < 2?'0':'').$g;
    $color .= (strlen($b) < 2?'0':'').$b;
    return '#'.$color;
}

score 0 · Answer 5 · answered Feb 22 '21 at 15:41

In case you want to use external solutions, spatie has a package for doing exacly what you want:

https://github.com/spatie/color

$rgb = Rgb::fromString('rgb(55,155,255)');

echo $rgb->red(); // 55
echo $rgb->green(); // 155
echo $rgb->blue(); // 255

echo $rgb; // rgb(55,155,255)

$rgba = $rgb->toRgba(); // `Spatie\Color\Rgba`
$rgba->alpha(); // 1
echo $rgba; // rgba(55,155,255,1)

$hex = $rgb->toHex(); // `Spatie\Color\Hex`
echo $hex; // #379bff

$hsl = $rgb->toHsl();
echo $hsl; // hsl(210,100%,100%)

arlomedia · Answer 6 · 2023-01-17T02:20:00.917

0

Based on the function from Mat Lipe, this changes all instances of rgb colors in a string:

$html = preg_replace_callback("/rgba?\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*,*\s*\d*\s*\)/i", function($matches) {
    return strtoupper(sprintf("#%02x%02x%02x", $matches[1], $matches[2], $matches[3]));
}, $html);

You can remove strtoupper if you prefer lowercase hex.

edited Jan 17 '23 at 02:20

answered Jan 13 '23 at 18:30

arlomedia

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Convert RGB to hex color values in PHP

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