Convert hex color to RGB values in PHP

Question

What would be a good way to convert hex color values like #ffffff into the single RGB values 255 255 255 using PHP?

Answer 1

My solution: (Supports short notation)

$color = "#0ab";
$colort = trim( $color );
if( $colort and is_string( $color ) and preg_match( "~^#?([abcdef0-9]{3}|[abcdef0-9]{6})$~ui", $colort ))
{
    if( preg_match( "~^#?[abcdef0-9]{3}$~ui", $colort ))
    {
        $hex = trim( $colort, "#" );
        list( $hexR, $hexG, $hexB ) = str_split( $hex );
        $hexR .= $hexR;
        $hexG .= $hexG;
        $hexB .= $hexB;
    }
    else
    {
        $hex = trim( $colort, "#" );
        list( $hexR, $hexG, $hexB ) = str_split( $hex, 2 );
    }

    $colorR = hexdec( $hexR );
    $colorG = hexdec( $hexG );
    $colorB = hexdec( $hexB );
}

// Test
echo $colorR ."/" .$colorG ."/" .$colorB;
// → 0/170/187

Answer 2

This is the only solution that worked for me. Some of the answers were not consistent enough.

    function hex2rgba($color, $opacity = false) {

        $default = 'rgb(0,0,0)';

        //Return default if no color provided
        if(empty($color))
              return $default;

        //Sanitize $color if "#" is provided
            if ($color[0] == '#' ) {
                $color = substr( $color, 1 );
            }

            //Check if color has 6 or 3 characters and get values
            if (strlen($color) == 6) {
                    $hex = array( $color[0] . $color[1], $color[2] . $color[3], $color[4] . $color[5] );
            } elseif ( strlen( $color ) == 3 ) {
                    $hex = array( $color[0] . $color[0], $color[1] . $color[1], $color[2] . $color[2] );
            } else {
                    return $default;
            }

            //Convert hexadec to rgb
            $rgb =  array_map('hexdec', $hex);

            //Check if opacity is set(rgba or rgb)
            if($opacity){
                if(abs($opacity) > 1)
                    $opacity = 1.0;
                $output = 'rgba('.implode(",",$rgb).','.$opacity.')';
            } else {
                $output = 'rgb('.implode(",",$rgb).')';
            }

            //Return rgb(a) color string
            return $output;
    }
    //hex2rgba("#ffaa11",1)

Answer 3

Convert Color Code HEX to RGB

$color = '#ffffff';
$hex = str_replace('#','', $color);
if(strlen($hex) == 3):
   $rgbArray['r'] = hexdec(substr($hex,0,1).substr($hex,0,1));
   $rgbArray['g'] = hexdec(substr($hex,1,1).substr($hex,1,1));
   $rgbArray['b'] = hexdec(substr($hex,2,1).substr($hex,2,1));
else:
   $rgbArray['r'] = hexdec(substr($hex,0,2));
   $rgbArray['g'] = hexdec(substr($hex,2,2));
   $rgbArray['b'] = hexdec(substr($hex,4,2));
endif;

print_r($rgbArray);

Output

Array ( [r] => 255 [g] => 255 [b] => 255 )

I have found this reference from here - Convert Color Hex to RGB and RGB to Hex using PHP