PHP longhand十六进制到RGB无法正常工作颜色名称转换为十六进制功能：获得该功能，如果已经是RGB，则不执行该操作：转换为RGBA：

问题描述

如何将正手十六进制转换为RGB（A）？例如，我有以下代码将所有格式的十六进制，颜色名称等转换为RGBA，以实现背景不透明性，但出于某种原因，正手十六进制不起作用，而是取自速记的简写形式（例如{{1 }}变成background-color: #0000ff;）。下面的许多代码基于Convert hex color to RGB values in PHP，但是该问题和类似问题无法解决我的问题。我花了两个星期的时间来寻找答案，但是还没有找到答案，所以我来了。

颜色名称转换为十六进制功能：

background-color: #000;

获得该功能，如果已经是RGB，则不执行该操作：

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);
    }
}

转换为RGBA：

$content__background_color = '#0000FF';
        if(strpos($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);
        }

任何想法都将不胜感激。

解决方法

该算法很好，您在strlen($colorname > 4 ? 2 : 1)处有一个错误的右括号，它应该为strlen($colorname) > 4 ? 2 : 1，因此将其更改为这样，便可以使用它：

list($r,$g,$b) = array_map(
    function($c) {
        return hexdec(str_pad($c,2,$c));
    },str_split(ltrim($colorname,'#'),strlen($colorname) > 4 ? 2 : 1)
);

您可以在sandbox.onlinephpfunctions.com上看到它的运行情况。

background-color hex rgba