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php转换颜色为其反色的方法,php转换颜色为其

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Release: 2016-06-13 09:05:59
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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) &#63; 0 : dechex($c);
    $rgb .= (strlen($c) < 2) &#63; '0'.$c : $c;
  }
  return '#'.$rgb;
}
//使用范例:
// black -> white
print color_inverse('#000000'); 
// --> returns #ffffff
// blue -> yellow
print color_inverse('#0000FF');
// --> #FFFF00
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希望本文所述对大家的php程序设计有所帮助。

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