How to convert a color to its inverse color in php_PHP tutorial

How to convert a color to its inverse color in php

This article mainly introduces the method of converting a color to its inverse color in php, involving the related skills of php operating color values, which are required Friends can refer to it

The example in this article describes the method of converting color to its inverse color in PHP. Share it with everyone for your reference. 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

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 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; } //使用范例： // black -> white print color_inverse('#000000'); // --> returns #ffffff // blue -> yellow print color_inverse('#0000FF'); // --> #FFFF00 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

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

I hope this article will be helpful to everyone’s PHP programming design. http://www.bkjia.com/PHPjc/990984.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/990984.htmlTechArticleHow to convert a color to its inverse color in php This article mainly introduces the method of converting a color to its inverse color in php , related skills related to php operating color values, friends who need it can refer to the following text...