معکوس کردن مقدار یک رنگ با کد PHP

<?php /* ** Function: color_inverse (PHP) ** Desc: This function inverses a color to it's opposite.(White to black, blue to yellow, etc.) ** Example: see below ** Author: Jonas John */ 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; } /* ** Examples: */ // black -> white print color_inverse('#000000'); // --> returns #ffffff // blue -> yellow print color_inverse('#0000FF'); // --> #FFFF00 ?>
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