How to get RGBA colors from HEX?

Question

css

Hello. Converting from HEX to RGB is not a problem, but how to do it in RGBA, that is, taking into account transparency?

Answer 1

no way

Answer 2

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;
}

Answer 3

As far as I know HEX = RGB but not RGBA.
For example: the color cornsilk is #FFF8DC, if you disassemble it in parts, then FF(255) F8(248) DC(220), as you can see, there is no additional character for the alpha channel, so the best option is to use the code that above in the answers.