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PHP code to convert a color to its inverse color

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Release： 2016-07-25 08:45:31
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This php code can change a color into the opposite color encoding, such as: white becomes black, blue becomes yellow

  1. function color_inverse($color){
  2. $color = str_replace('# ', '', $color);
  3. if (strlen($color) != 6){ return '000000'; }
  4. $rgb = '';
  5. for ($x=0;$x<3;$x++ ){
  6. $c = 255 - hexdec(substr($color,(2*$x),2));
  7. $c = ($c < 0) ? 0 : dechex($c);
  8. $rgb . = (strlen($c) < 2) ? '0'.$c : $c;
  9. }
  10. return '#'.$rgb;
  11. }
  13. //Usage example:
  14. // black -> white
  15. print color_inverse('#000000');
  16. // --> returns #ffffff
  18. // blue -> yellow
  19. print color_inverse('#0000FF');
  20. // --> #FFFF00
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Convert to, and vice versa, PHP


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将颜色转换为其反色的PHP代码
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