如何将长手十六进制转换为RGB(A(？例如，我有以下代码将所有格式的十六进制、colorname等转换为RGBA以获得背景不透明度，但由于某些原因，长手十六进制不起作用，而是采用了长手的简写(例如background-color: #0000ff;变成background-color: #000;(。下面的大部分代码都是基于PHP中的"将十六进制颜色转换为RGB值"，但这个问题和类似的问题无法解决我的问题。我花了两个星期的时间寻找答案，但还没有找到，所以我来到了这里。
十六进制函数的颜色名称：
function color_name_to_hex($color_name) {
$colors = array(
'aliceblue'=>'F0F8FF',
'antiquewhite'=>'FAEBD7',
'aqua'=>'00FFFF',
'aquamarine'=>'7FFFD4',
'azure'=>'F0FFFF',
'beige'=>'F5F5DC',
'bisque'=>'FFE4C4',
'black'=>'000000',
'blanchedalmond '=>'FFEBCD',
'blue'=>'0000FF',
'blueviolet'=>'8A2BE2',
'brown'=>'A52A2A',
'burlywood'=>'DEB887',
'cadetblue'=>'5F9EA0',
'chartreuse'=>'7FFF00',
'chocolate'=>'D2691E',
'coral'=>'FF7F50',
'cornflowerblue'=>'6495ED',
'cornsilk'=>'FFF8DC',
'crimson'=>'DC143C',
'cyan'=>'00FFFF',
'darkblue'=>'00008B',
'darkcyan'=>'008B8B',
'darkgoldenrod'=>'B8860B',
'darkgray'=>'A9A9A9',
'darkgreen'=>'006400',
'darkgrey'=>'A9A9A9',
'darkkhaki'=>'BDB76B',
'darkmagenta'=>'8B008B',
'darkolivegreen'=>'556B2F',
'darkorange'=>'FF8C00',
'darkorchid'=>'9932CC',
'darkred'=>'8B0000',
'darksalmon'=>'E9967A',
'darkseagreen'=>'8FBC8F',
'darkslateblue'=>'483D8B',
'darkslategray'=>'2F4F4F',
'darkslategrey'=>'2F4F4F',
'darkturquoise'=>'00CED1',
'darkviolet'=>'9400D3',
'deeppink'=>'FF1493',
'deepskyblue'=>'00BFFF',
'dimgray'=>'696969',
'dimgrey'=>'696969',
'dodgerblue'=>'1E90FF',
'firebrick'=>'B22222',
'floralwhite'=>'FFFAF0',
'forestgreen'=>'228B22',
'fuchsia'=>'FF00FF',
'gainsboro'=>'DCDCDC',
'ghostwhite'=>'F8F8FF',
'gold'=>'FFD700',
'goldenrod'=>'DAA520',
'gray'=>'808080',
'green'=>'008000',
'greenyellow'=>'ADFF2F',
'grey'=>'808080',
'honeydew'=>'F0FFF0',
'hotpink'=>'FF69B4',
'indianred'=>'CD5C5C',
'indigo'=>'4B0082',
'ivory'=>'FFFFF0',
'khaki'=>'F0E68C',
'lavender'=>'E6E6FA',
'lavenderblush'=>'FFF0F5',
'lawngreen'=>'7CFC00',
'lemonchiffon'=>'FFFACD',
'lightblue'=>'ADD8E6',
'lightcoral'=>'F08080',
'lightcyan'=>'E0FFFF',
'lightgoldenrodyellow'=>'FAFAD2',
'lightgray'=>'D3D3D3',
'lightgreen'=>'90EE90',
'lightgrey'=>'D3D3D3',
'lightpink'=>'FFB6C1',
'lightsalmon'=>'FFA07A',
'lightseagreen'=>'20B2AA',
'lightskyblue'=>'87CEFA',
'lightslategray'=>'778899',
'lightslategrey'=>'778899',
'lightsteelblue'=>'B0C4DE',
'lightyellow'=>'FFFFE0',
'lime'=>'00FF00',
'limegreen'=>'32CD32',
'linen'=>'FAF0E6',
'magenta'=>'FF00FF',
'maroon'=>'800000',
'mediumaquamarine'=>'66CDAA',
'mediumblue'=>'0000CD',
'mediumorchid'=>'BA55D3',
'mediumpurple'=>'9370D0',
'mediumseagreen'=>'3CB371',
'mediumslateblue'=>'7B68EE',
'mediumspringgreen'=>'00FA9A',
'mediumturquoise'=>'48D1CC',
'mediumvioletred'=>'C71585',
'midnightblue'=>'191970',
'mintcream'=>'F5FFFA',
'mistyrose'=>'FFE4E1',
'moccasin'=>'FFE4B5',
'navajowhite'=>'FFDEAD',
'navy'=>'000080',
'oldlace'=>'FDF5E6',
'olive'=>'808000',
'olivedrab'=>'6B8E23',
'orange'=>'FFA500',
'orangered'=>'FF4500',
'orchid'=>'DA70D6',
'palegoldenrod'=>'EEE8AA',
'palegreen'=>'98FB98',
'paleturquoise'=>'AFEEEE',
'palevioletred'=>'DB7093',
'papayawhip'=>'FFEFD5',
'peachpuff'=>'FFDAB9',
'peru'=>'CD853F',
'pink'=>'FFC0CB',
'plum'=>'DDA0DD',
'powderblue'=>'B0E0E6',
'purple'=>'800080',
'red'=>'FF0000',
'rosybrown'=>'BC8F8F',
'royalblue'=>'4169E1',
'saddlebrown'=>'8B4513',
'salmon'=>'FA8072',
'sandybrown'=>'F4A460',
'seagreen'=>'2E8B57',
'seashell'=>'FFF5EE',
'sienna'=>'A0522D',
'silver'=>'C0C0C0',
'skyblue'=>'87CEEB',
'slateblue'=>'6A5ACD',
'slategray'=>'708090',
'slategrey'=>'708090',
'snow'=>'FFFAFA',
'springgreen'=>'00FF7F',
'steelblue'=>'4682B4',
'tan'=>'D2B48C',
'teal'=>'008080',
'thistle'=>'D8BFD8',
'tomato'=>'FF6347',
'turquoise'=>'40E0D0',
'violet'=>'EE82EE',
'wheat'=>'F5DEB3',
'white'=>'FFFFFF',
'whitesmoke'=>'F5F5F5',
'yellow'=>'FFFF00',
'yellowgreen'=>'9ACD32');
$color_name = strtolower($color_name);
if (isset($colors[$color_name]))
{
return ('#' . $colors[$color_name]);
}
else
{
return ($color_name);
}
}
获取该函数，如果已经RGB，则不要执行：
$content__background_color = '#0000FF';
if(strpos($content__background_color, 'rgb') !== false){
$rgbarr = explode(",",$content__background_color,3);
$colorname = sprintf("#%02x%02x%02x", $rgbarr[0], $rgbarr[1], $rgbarr[2]);
} else {
$colorname = self::color_name_to_hex($content__background_color);
}
转换为RGBA：
list($r, $g, $b) = array_map(function($c){return hexdec(str_pad($c, 2, $c));}, str_split(ltrim($colorname, '#'), strlen($colorname > 4 ? 2 : 1)));
$send_to_less_example[ 'content-opacity-level' ] = "rgba($r, $g, $b, " . '75' / 100.00 . ')';
return $send_to_less_example;
任何想法都将不胜感激。
算法很好，你只是在strlen($colorname > 4 ? 2 : 1)处有一个错误的右括号，它应该是strlen($colorname) > 4 ? 2 : 1，所以把它改成这样，你就会让它工作：
list($r, $g, $b) = array_map(
function($c) {
return hexdec(str_pad($c, 2, $c));
},
str_split(ltrim($colorname, '#'), strlen($colorname) > 4 ? 2 : 1)
);
你可以在sandbox.onlinehpfunctions.com上看到它的工作原理。