Hướng dẫn php hex to rgb

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/* Convert hexdec color string to rgb(a) string */

functionhex2rgba($color,$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;

}

/* Here's a usage example how to use this function for dynamicaly created CSS */

$color='#ffa226';

$rgb=hex2rgba($color);

$rgba= hex2rgba($color,0.7);

/* CSS output */

echo'

div.example{

background: '.$rgb.';

color: '.$rgba.';

}

';