php转换颜色为其反色的方法，php转换颜色为其
本文实例讲述了php转换颜色为其反色的方法。分享给大家供大家参考。具体分析如下：
这段php代码可以把一个颜色变成与之相反的颜色编码，如：白色变成黑色，蓝色变成黄色
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
希望本文所述对大家的php程序设计有所帮助。
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