PHP operates color value and converts color to its inverse color

This article mainly introduces the method of converting color to its inverse color in PHP, involving the related skills of PHP operating color values. Friends in need can refer to the following

The example of this article describes the conversion of color into its inverse color in PHP color method. The specific analysis is as follows:

This php code can change a color into the opposite color coding, 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) ? &#39;0&#39;.$c : $c;
  }
  return &#39;#&#39;.$rgb;
}
//使用范例：
// black -> white
print color_inverse(&#39;#000000&#39;); 
// --> returns #ffffff
// blue -> yellow
print color_inverse(&#39;#0000FF&#39;);
// --> #FFFF00

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