Color inverse
This function inverses a color to it's opposite.
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(White to black, blue to yellow, etc.)
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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;
}
//Example
// black -> white
print color_inverse('#000000');
// --> returns #ffffff
// blue -> yellow
print color_inverse('#0000FF');
// --> #FFFF00
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Url: http://www.jonasjohn.de/snippets/php/color-inverse.htm
Language: PHP | User: ShareMySnippets | Created: Oct 16, 2013