This php code can change a color into the opposite color encoding, such as: white becomes black, blue becomes yellow
- function color_inverse($color){
- $color = str_replace('# ', '', $color);
- if (strlen($color) != 6){ return '000000'; }
- $rgb = '';
- for ($x=0;$x<3;$x++ ){
- $c = 255 - hexdec(substr($color,(2*$x),2));
- $c = ($c < 0) ? 0 : dechex($c);
- $rgb . = (strlen($c) < 2) ? '0'.$c : $c;
- }
- return '#'.$rgb;
- }
- //Usage example:
- // black -> white
- print color_inverse('#000000');
- // --> returns #ffffff
-
- // blue -> yellow
- print color_inverse('#0000FF');
- // --> #FFFF00
-
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Convert to, and vice versa, PHP