Функция, которая преобразует шестнадцатеричные значения цвета в приблизительное название цвета?

У вас есть список цветов здесь, в википедии.

Наивная реализация просто вычисляла бы расстояние между цветом, имя которого вы хотите получить, и каждым из них и выводила бы тот, который ближе.

Если вы видите цвета как векторы в R3, вы можете рассчитать расстояние как норму L1:

function distancel1(array $color1, array $color2) {
    return abs($color1[0] - $color2[0]) + 
        abs($color1[1] - $color2[1]) +
        abs($color1[2] - $color2[2]);
}

или норма L2:

function distancel2(array $color1, array $color2) {
    return sqrt(pow($color1[0] - $color2[0], 2) +
        pow($color1[1] - $color2[1], 2) +
        pow($color1[2] - $color2[2], 2));
}

Информацию о преобразовании шестнадцатеричного представления см. здесь.

Пример сценария:

<?php

$colors = array(
    "black"     => array(0, 0, 0),
    "green"     => array(0, 128, 0),
    "silver"    => array(192, 192, 192),
    "lime"      => array(0, 255, 0),
    "gray"      => array(128, 0, 128),
    "olive"     => array(128, 128, 0),
    "white"     => array(255, 255, 255),
    "yellow"    => array(255, 255, 0),
    "maroon"    => array(128, 0, 0),
    "navy"      => array(0, 0, 128),
    "red"       => array(255, 0, 0),
    "blue"      => array(0, 0, 255),
    "purple"    => array(128, 0, 128),
    "teal"      => array(0, 128, 128),
    "fuchsia"   => array(255, 0, 255),
    "aqua"      => array(0, 255, 255),
);

$value = "#819001";

function html2rgb($color)
{
    if ($color[0] == '#')
        $color = substr($color, 1);

    if (strlen($color) == 6)
        list($r, $g, $b) = array($color[0].$color[1],
                                 $color[2].$color[3],
                                 $color[4].$color[5]);
    elseif (strlen($color) == 3)
        list($r, $g, $b) = array($color[0].$color[0],
            $color[1].$color[1], $color[2].$color[2]);
    else
        return false;

    $r = hexdec($r); $g = hexdec($g); $b = hexdec($b);

    return array($r, $g, $b);
}

function distancel2(array $color1, array $color2) {
    return sqrt(pow($color1[0] - $color2[0], 2) +
        pow($color1[1] - $color2[1], 2) +
        pow($color1[2] - $color2[2], 2));
}

$distances = array();
$val = html2rgb($value);
foreach ($colors as $name => $c) {
    $distances[$name] = distancel2($c, $val);
}

$mincolor = "";
$minval = pow(2, 30); /*big value*/
foreach ($distances as $k => $v) {
    if ($v < $minval) {
        $minval = $v;
        $mincolor = $k;
    }
}

echo "Closest color: $mincolor\n";

Используя вики-ссылку, использованную в ответе Artefacto, я взял все названия цветов и сформировал массив, содержащий 1175 названий цветов. К сожалению, Stackoverflow допускает только 30 000 символов в ответах, поэтому вот ссылка.

Вот более крупный массив цветов, часть 1:

$colors = array(
    "cloudy blue" => array(172, 194, 217),
    "dark pastel green" => array(86, 174, 87),
    "dust" => array(178, 153, 110),
    "electric lime" => array(168, 255, 4),
    "fresh green" => array(105, 216, 79),
    "light eggplant" => array(137, 69, 133),
    "nasty green" => array(112, 178, 63),
    "really light blue" => array(212, 255, 255),
    "tea" => array(101, 171, 124),
    "warm purple" => array(149, 46, 143),
    "yellowish tan" => array(252, 252, 129),
    "cement" => array(165, 163, 145),
    "dark grass green" => array(56, 128, 4),
    "dusty teal" => array(76, 144, 133),
    "grey teal" => array(94, 155, 138),
    "macaroni and cheese" => array(239, 180, 53),
    "pinkish tan" => array(217, 155, 130),
    "spruce" => array(10, 95, 56),
    "strong blue" => array(12, 6, 247),
    "toxic green" => array(97, 222, 42),
    "windows blue" => array(55, 120, 191),
    "blue blue" => array(34, 66, 199),
    "blue with a hint of purple" => array(83, 60, 198),
    "booger" => array(155, 181, 60),
    "bright sea green" => array(5, 255, 166),
    "dark green blue" => array(31, 99, 87),
    "deep turquoise" => array(1, 115, 116),
    "green teal" => array(12, 181, 119),
    "strong pink" => array(255, 7, 137),
    "bland" => array(175, 168, 139),
    "deep aqua" => array(8, 120, 127),
    "lavender pink" => array(221, 133, 215),
    "light moss green" => array(166, 200, 117),
    "light seafoam green" => array(167, 255, 181),
    "olive yellow" => array(194, 183, 9),
    "pig pink" => array(231, 142, 165),
    "deep lilac" => array(150, 110, 189),
    "desert" => array(204, 173, 96),
    "dusty lavender" => array(172, 134, 168),
    "purpley grey" => array(148, 126, 148),
    "purply" => array(152, 63, 178),
    "candy pink" => array(255, 99, 233),
    "light pastel green" => array(178, 251, 165),
    "boring green" => array(99, 179, 101),
    "kiwi green" => array(142, 229, 63),
    "light grey green" => array(183, 225, 161),
    "orange pink" => array(255, 111, 82),
    "tea green" => array(189, 248, 163),
    "very light brown" => array(211, 182, 131),
    "egg shell" => array(255, 252, 196),
    "eggplant purple" => array(67, 5, 65),
    "powder pink" => array(255, 178, 208),
    "reddish grey" => array(153, 117, 112),
    "baby shit brown" => array(173, 144, 13),
    "liliac" => array(196, 142, 253),
    "stormy blue" => array(80, 123, 156),
    "ugly brown" => array(125, 113, 3),
    "custard" => array(255, 253, 120),
    "darkish pink" => array(218, 70, 125),
    "deep brown" => array(65, 2, 0),
    "greenish beige" => array(201, 209, 121),
    "manilla" => array(255, 250, 134),
    "off blue" => array(86, 132, 174),
    "battleship grey" => array(107, 124, 133),
    "browny green" => array(111, 108, 10),
    "bruise" => array(126, 64, 113),
    "kelley green" => array(0, 147, 55),
    "sickly yellow" => array(208, 228, 41),
    "sunny yellow" => array(255, 249, 23),
    "azul" => array(29, 93, 236),
    "darkgreen" => array(5, 73, 7),
    "green/yellow" => array(181, 206, 8),
    "lichen" => array(143, 182, 123),
    "light light green" => array(200, 255, 176),
    "pale gold" => array(253, 222, 108),
    "sun yellow" => array(255, 223, 34),
    "tan green" => array(169, 190, 112),
    "burple" => array(104, 50, 227),
    "butterscotch" => array(253, 177, 71),
    "toupe" => array(199, 172, 125),
    "dark cream" => array(255, 243, 154),
    "indian red" => array(133, 14, 4),
    "light lavendar" => array(239, 192, 254),
    "poison green" => array(64, 253, 20),
    "baby puke green" => array(182, 196, 6),
    "bright yellow green" => array(157, 255, 0),
    "charcoal grey" => array(60, 65, 66),
    "squash" => array(242, 171, 21),
    "cinnamon" => array(172, 79, 6),
    "light pea green" => array(196, 254, 130),
    "radioactive green" => array(44, 250, 31),
    "raw sienna" => array(154, 98, 0),
    "baby purple" => array(202, 155, 247),
    "cocoa" => array(135, 95, 66),
    "light royal blue" => array(58, 46, 254),
    "orangeish" => array(253, 141, 73),
    "rust brown" => array(139, 49, 3),
    "sand brown" => array(203, 165, 96),
    "swamp" => array(105, 131, 57),
    "tealish green" => array(12, 220, 115),
    "burnt siena" => array(183, 82, 3),
    "camo" => array(127, 143, 78),
    "dusk blue" => array(38, 83, 141),
    "fern" => array(99, 169, 80),
    "old rose" => array(200, 127, 137),
    "pale light green" => array(177, 252, 153),
    "peachy pink" => array(255, 154, 138),
    "rosy pink" => array(246, 104, 142),
    "light bluish green" => array(118, 253, 168),
    "light bright green" => array(83, 254, 92),
    "light neon green" => array(78, 253, 84),
    "light seafoam" => array(160, 254, 191),
    "tiffany blue" => array(123, 242, 218),
    "washed out green" => array(188, 245, 166),
    "browny orange" => array(202, 107, 2),
    "nice blue" => array(16, 122, 176),
    "sapphire" => array(33, 56, 171),
    "greyish teal" => array(113, 159, 145),
    "orangey yellow" => array(253, 185, 21),
    "parchment" => array(254, 252, 175),
    "straw" => array(252, 246, 121),
    "very dark brown" => array(29, 2, 0),
    "terracota" => array(203, 104, 67),
    "ugly blue" => array(49, 102, 138),
    "clear blue" => array(36, 122, 253),
    "creme" => array(255, 255, 182),
    "foam green" => array(144, 253, 169),
    "grey/green" => array(134, 161, 125),
    "light gold" => array(253, 220, 92),
    "seafoam blue" => array(120, 209, 182),
    "topaz" => array(19, 187, 175),
    "violet pink" => array(251, 95, 252),
    "wintergreen" => array(32, 249, 134),
    "yellow tan" => array(255, 227, 110),
    "dark fuchsia" => array(157, 7, 89),
    "indigo blue" => array(58, 24, 177),
    "light yellowish green" => array(194, 255, 137),
    "pale magenta" => array(215, 103, 173),
    "rich purple" => array(114, 0, 88),
    "sunflower yellow" => array(255, 218, 3),
    "green/blue" => array(1, 192, 141),
    "leather" => array(172, 116, 52),
    "racing green" => array(1, 70, 0),
    "vivid purple" => array(153, 0, 250),
    "dark royal blue" => array(2, 6, 111),
    "hazel" => array(142, 118, 24),
    "muted pink" => array(209, 118, 143),
    "booger green" => array(150, 180, 3),
    "canary" => array(253, 255, 99),
    "cool grey" => array(149, 163, 166),
    "dark taupe" => array(127, 104, 78),
    "darkish purple" => array(117, 25, 115),
    "true green" => array(8, 148, 4),
    "coral pink" => array(255, 97, 99),
    "dark sage" => array(89, 133, 86),
    "dark slate blue" => array(33, 71, 97),
    "flat blue" => array(60, 115, 168),
    "mushroom" => array(186, 158, 136),
    "rich blue" => array(2, 27, 249),
    "dirty purple" => array(115, 74, 101),
    "greenblue" => array(35, 196, 139),
    "icky green" => array(143, 174, 34),
    "light khaki" => array(230, 242, 162),
    "warm blue" => array(75, 87, 219),
    "dark hot pink" => array(217, 1, 102),
    "deep sea blue" => array(1, 84, 130),
    "carmine" => array(157, 2, 22),
    "dark yellow green" => array(114, 143, 2),
    "pale peach" => array(255, 229, 173),
    "plum purple" => array(78, 5, 80),
    "golden rod" => array(249, 188, 8),
    "neon red" => array(255, 7, 58),
    "old pink" => array(199, 121, 134),
    "very pale blue" => array(214, 255, 254),
    "blood orange" => array(254, 75, 3),
    "grapefruit" => array(253, 89, 86),
    "sand yellow" => array(252, 225, 102),
    "clay brown" => array(178, 113, 61),
    "dark blue grey" => array(31, 59, 77),
    "flat green" => array(105, 157, 76),
    "light green blue" => array(86, 252, 162),
    "warm pink" => array(251, 85, 129),
    "dodger blue" => array(62, 130, 252),
    "gross green" => array(160, 191, 22),
    "ice" => array(214, 255, 250),
    "metallic blue" => array(79, 115, 142),
    "pale salmon" => array(255, 177, 154),
    "sap green" => array(92, 139, 21),
    "algae" => array(84, 172, 104),
    "bluey grey" => array(137, 160, 176),
    "greeny grey" => array(126, 160, 122),
    "highlighter green" => array(27, 252, 6),
    "light light blue" => array(202, 255, 251),
    "light mint" => array(182, 255, 187),
    "raw umber" => array(167, 94, 9),
    "vivid blue" => array(21, 46, 255),
    "deep lavender" => array(141, 94, 183),
    "dull teal" => array(95, 158, 143),
    "light greenish blue" => array(99, 247, 180),
    "mud green" => array(96, 102, 2),
    "pinky" => array(252, 134, 170),
    "red wine" => array(140, 0, 52),
    "shit green" => array(117, 128, 0),
    "tan brown" => array(171, 126, 76),
    "darkblue" => array(3, 7, 100),
    "rosa" => array(254, 134, 164),
    "lipstick" => array(213, 23, 78),
    "pale mauve" => array(254, 208, 252),
    "claret" => array(104, 0, 24),
    "dandelion" => array(254, 223, 8),
    "orangered" => array(254, 66, 15),
    "poop green" => array(111, 124, 0),
    "ruby" => array(202, 1, 71),
    "dark" => array(27, 36, 49),
    "greenish turquoise" => array(0, 251, 176),
    "pastel red" => array(219, 88, 86),
    "piss yellow" => array(221, 214, 24),
    "bright cyan" => array(65, 253, 254),
    "dark coral" => array(207, 82, 78),
    "algae green" => array(33, 195, 111),
    "darkish red" => array(169, 3, 8),
    "reddy brown" => array(110, 16, 5),
    "blush pink" => array(254, 130, 140),
    "camouflage green" => array(75, 97, 19),
    "lawn green" => array(77, 164, 9),
    "putty" => array(190, 174, 138),
    "vibrant blue" => array(3, 57, 248),
    "dark sand" => array(168, 143, 89),
    "purple/blue" => array(93, 33, 208),
    "saffron" => array(254, 178, 9),
    "twilight" => array(78, 81, 139),
    "warm brown" => array(150, 78, 2),
    "bluegrey" => array(133, 163, 178),
    "bubble gum pink" => array(255, 105, 175),
    "duck egg blue" => array(195, 251, 244),
    "greenish cyan" => array(42, 254, 183),
    "petrol" => array(0, 95, 106),
    "royal" => array(12, 23, 147),
    "butter" => array(255, 255, 129),
    "dusty orange" => array(240, 131, 58),
    "off yellow" => array(241, 243, 63),
    "pale olive green" => array(177, 210, 123),
    "orangish" => array(252, 130, 74),
    "leaf" => array(113, 170, 52),
    "light blue grey" => array(183, 201, 226),
    "dried blood" => array(75, 1, 1),
    "lightish purple" => array(165, 82, 230),
    "rusty red" => array(175, 47, 13),
    "lavender blue" => array(139, 136, 248),
    "light grass green" => array(154, 247, 100),
    "light mint green" => array(166, 251, 178),
    "sunflower" => array(255, 197, 18),
    "velvet" => array(117, 8, 81),
    "brick orange" => array(193, 74, 9),
    "lightish red" => array(254, 47, 74),
    "pure blue" => array(2, 3, 226),
    "twilight blue" => array(10, 67, 122),
    "violet red" => array(165, 0, 85),
    "yellowy brown" => array(174, 139, 12),
    "carnation" => array(253, 121, 143),
    "muddy yellow" => array(191, 172, 5),
    "dark seafoam green" => array(62, 175, 118),
    "deep rose" => array(199, 71, 103),
    "dusty red" => array(185, 72, 78),
    "grey/blue" => array(100, 125, 142),
    "lemon lime" => array(191, 254, 40),
    "purple/pink" => array(215, 37, 222),
    "brown yellow" => array(178, 151, 5),
    "purple brown" => array(103, 58, 63),
    "wisteria" => array(168, 125, 194),
    "banana yellow" => array(250, 254, 75),
    "lipstick red" => array(192, 2, 47),
    "water blue" => array(14, 135, 204),
    "brown grey" => array(141, 132, 104),
    "vibrant purple" => array(173, 3, 222),
    "baby green" => array(140, 255, 158),
    "barf green" => array(148, 172, 2),
    "eggshell blue" => array(196, 255, 247),
    "sandy yellow" => array(253, 238, 115),
    "cool green" => array(51, 184, 100),
    "pale" => array(255, 249, 208),
    "blue/grey" => array(117, 141, 163),
    "hot magenta" => array(245, 4, 201),
    "greyblue" => array(119, 161, 181),
    "purpley" => array(135, 86, 228),
    "baby shit green" => array(136, 151, 23),
    "brownish pink" => array(194, 126, 121),
    "dark aquamarine" => array(1, 115, 113),
    "diarrhea" => array(159, 131, 3),
    "light mustard" => array(247, 213, 96),
    "pale sky blue" => array(189, 246, 254),
    "turtle green" => array(117, 184, 79),
    "bright olive" => array(156, 187, 4),
    "dark grey blue" => array(41, 70, 91),
    "greeny brown" => array(105, 96, 6),
    "lemon green" => array(173, 248, 2),
    "light periwinkle" => array(193, 198, 252),
    "seaweed green" => array(53, 173, 107),
    "sunshine yellow" => array(255, 253, 55),
    "ugly purple" => array(164, 66, 160),
    "medium pink" => array(243, 97, 150),
    "puke brown" => array(148, 119, 6),
    "very light pink" => array(255, 244, 242),
    "viridian" => array(30, 145, 103),
    "bile" => array(181, 195, 6),
    "faded yellow" => array(254, 255, 127),
    "very pale green" => array(207, 253, 188),
    "vibrant green" => array(10, 221, 8),
    "bright lime" => array(135, 253, 5),
    "spearmint" => array(30, 248, 118),
    "light aquamarine" => array(123, 253, 199),
    "light sage" => array(188, 236, 172),
    "yellowgreen" => array(187, 249, 15),
    "baby poo" => array(171, 144, 4),
    "dark seafoam" => array(31, 181, 122),
    "deep teal" => array(0, 85, 90),
    "heather" => array(164, 132, 172),
    "rust orange" => array(196, 85, 8),
    "dirty blue" => array(63, 130, 157),
    "fern green" => array(84, 141, 68),
    "bright lilac" => array(201, 94, 251),
    "weird green" => array(58, 229, 127),
    "peacock blue" => array(1, 103, 149),
    "avocado green" => array(135, 169, 34),
    "faded orange" => array(240, 148, 77),
    "grape purple" => array(93, 20, 81),
    "hot green" => array(37, 255, 41),
    "lime yellow" => array(208, 254, 29),
    "mango" => array(255, 166, 43),
    "shamrock" => array(1, 180, 76),
    "bubblegum" => array(255, 108, 181),
    "purplish brown" => array(107, 66, 71),
    "vomit yellow" => array(199, 193, 12),
    "pale cyan" => array(183, 255, 250),
    "key lime" => array(174, 255, 110),
    "tomato red" => array(236, 45, 1),
    "lightgreen" => array(118, 255, 123),
    "merlot" => array(115, 0, 57),
    "night blue" => array(4, 3, 72),
    "purpleish pink" => array(223, 78, 200),
    "apple" => array(110, 203, 60),
    "baby poop green" => array(143, 152, 5),
    "green apple" => array(94, 220, 31),
    "heliotrope" => array(217, 79, 245),
    "yellow/green" => array(200, 253, 61),
    "almost black" => array(7, 13, 13),
    "cool blue" => array(73, 132, 184),
    "leafy green" => array(81, 183, 59),
    "mustard brown" => array(172, 126, 4),
    "dusk" => array(78, 84, 129),
    "dull brown" => array(135, 110, 75),
    "frog green" => array(88, 188, 8),
    "vivid green" => array(47, 239, 16),
    "bright light green" => array(45, 254, 84),
    "fluro green" => array(10, 255, 2),
    "kiwi" => array(156, 239, 67),
    "seaweed" => array(24, 209, 123),
    "navy green" => array(53, 83, 10),
    "ultramarine blue" => array(24, 5, 219),
    "iris" => array(98, 88, 196),
    "pastel orange" => array(255, 150, 79),
    "yellowish orange" => array(255, 171, 15),
    "perrywinkle" => array(143, 140, 231),
    "tealish" => array(36, 188, 168),
    "dark plum" => array(63, 1, 44),
    "pear" => array(203, 248, 95),
    "pinkish orange" => array(255, 114, 76),
    "midnight purple" => array(40, 1, 55),
    "light urple" => array(179, 111, 246),
    "dark mint" => array(72, 192, 114),
    "greenish tan" => array(188, 203, 122),
    "light burgundy" => array(168, 65, 91),
    "turquoise blue" => array(6, 177, 196),
    "ugly pink" => array(205, 117, 132),
    "sandy" => array(241, 218, 122),
    "electric pink" => array(255, 4, 144),
    "muted purple" => array(128, 91, 135),
    "mid green" => array(80, 167, 71),
    "greyish" => array(168, 164, 149),
    "neon yellow" => array(207, 255, 4),
    "banana" => array(255, 255, 126),
    "carnation pink" => array(255, 127, 167),
    "tomato" => array(239, 64, 38),
    "sea" => array(60, 153, 146),
    "muddy brown" => array(136, 104, 6),
    "turquoise green" => array(4, 244, 137),
    "buff" => array(254, 246, 158),
    "fawn" => array(207, 175, 123),
    "muted blue" => array(59, 113, 159),
    "pale rose" => array(253, 193, 197),
    "dark mint green" => array(32, 192, 115),
    "amethyst" => array(155, 95, 192),
    "blue/green" => array(15, 155, 142),
    "chestnut" => array(116, 40, 2),
    "sick green" => array(157, 185, 44),
    "pea" => array(164, 191, 32),
    "rusty orange" => array(205, 89, 9),
    "stone" => array(173, 165, 135),
    "rose red" => array(190, 1, 60),
    "pale aqua" => array(184, 255, 235),
    "deep orange" => array(220, 77, 1),
    "earth" => array(162, 101, 62),
    "mossy green" => array(99, 139, 39),
    "grassy green" => array(65, 156, 3),
    "pale lime green" => array(177, 255, 101),
    "light grey blue" => array(157, 188, 212),
    "pale grey" => array(253, 253, 254),
    "asparagus" => array(119, 171, 86),
    "blueberry" => array(70, 65, 150),
    "purple red" => array(153, 1, 71),
    "pale lime" => array(190, 253, 115),
    "greenish teal" => array(50, 191, 132),
    "caramel" => array(175, 111, 9),
    "deep magenta" => array(160, 2, 92),
    "light peach" => array(255, 216, 177),
    "milk chocolate" => array(127, 78, 30),
    "ocher" => array(191, 155, 12),
    "off green" => array(107, 163, 83),
    "purply pink" => array(240, 117, 230),
    "lightblue" => array(123, 200, 246),
    "dusky blue" => array(71, 95, 148),
    "golden" => array(245, 191, 3),
    "light beige" => array(255, 254, 182),
    "butter yellow" => array(255, 253, 116),
    "dusky purple" => array(137, 91, 123),
    "french blue" => array(67, 107, 173),
    "ugly yellow" => array(208, 193, 1),
    "greeny yellow" => array(198, 248, 8),
    "orangish red" => array(244, 54, 5),
    "shamrock green" => array(2, 193, 77),
    "orangish brown" => array(178, 95, 3),
    "tree green" => array(42, 126, 25),
    "deep violet" => array(73, 6, 72),
    "gunmetal" => array(83, 98, 103),
    "blue/purple" => array(90, 6, 239),
    "cherry" => array(207, 2, 52),
    "sandy brown" => array(196, 166, 97),
    "warm grey" => array(151, 138, 132),
    "dark indigo" => array(31, 9, 84),
    "midnight" => array(3, 1, 45),
    "bluey green" => array(43, 177, 121),
    "grey pink" => array(195, 144, 155),
    "soft purple" => array(166, 111, 181),
    "blood" => array(119, 0, 1),
    "brown red" => array(146, 43, 5),
    "medium grey" => array(125, 127, 124),
    "berry" => array(153, 15, 75),
    "poo" => array(143, 115, 3),
    "purpley pink" => array(200, 60, 185),
    "light salmon" => array(254, 169, 147),
    "snot" => array(172, 187, 13),
    "easter purple" => array(192, 113, 254),
    "light yellow green" => array(204, 253, 127),
    "dark navy blue" => array(0, 2, 46),
    "drab" => array(130, 131, 68),
    "light rose" => array(255, 197, 203),
    "rouge" => array(171, 18, 57),
    "purplish red" => array(176, 5, 75),
    "slime green" => array(153, 204, 4),
    "baby poop" => array(147, 124, 0),
    "irish green" => array(1, 149, 41),
    "pink/purple" => array(239, 29, 231),
    "dark navy" => array(0, 4, 53),
    "greeny blue" => array(66, 179, 149),
    "light plum" => array(157, 87, 131),
    "pinkish grey" => array(200, 172, 169),
    "dirty orange" => array(200, 118, 6),
    "rust red" => array(170, 39, 4),
    "pale lilac" => array(228, 203, 255),
    "orangey red" => array(250, 66, 36),
    "primary blue" => array(8, 4, 249),
    "kermit green" => array(92, 178, 0),
    "brownish purple" => array(118, 66, 78),
    "murky green" => array(108, 122, 14)
);

Вот более крупный массив цветов, часть 2:

$colors = array(
    "wheat" => array(251, 221, 126),
    "very dark purple" => array(42, 1, 52),
    "bottle green" => array(4, 74, 5),
    "watermelon" => array(253, 70, 89),
    "deep sky blue" => array(13, 117, 248),
    "fire engine red" => array(254, 0, 2),
    "yellow ochre" => array(203, 157, 6),
    "pumpkin orange" => array(251, 125, 7),
    "pale olive" => array(185, 204, 129),
    "light lilac" => array(237, 200, 255),
    "lightish green" => array(97, 225, 96),
    "carolina blue" => array(138, 184, 254),
    "mulberry" => array(146, 10, 78),
    "shocking pink" => array(254, 2, 162),
    "auburn" => array(154, 48, 1),
    "bright lime green" => array(101, 254, 8),
    "celadon" => array(190, 253, 183),
    "pinkish brown" => array(177, 114, 97),
    "poo brown" => array(136, 95, 1),
    "bright sky blue" => array(2, 204, 254),
    "celery" => array(193, 253, 149),
    "dirt brown" => array(131, 101, 57),
    "strawberry" => array(251, 41, 67),
    "dark lime" => array(132, 183, 1),
    "copper" => array(182, 99, 37),
    "medium brown" => array(127, 81, 18),
    "muted green" => array(95, 160, 82),
    "robin's egg" => array(109, 237, 253),
    "bright aqua" => array(11, 249, 234),
    "bright lavender" => array(199, 96, 255),
    "ivory" => array(255, 255, 203),
    "very light purple" => array(246, 206, 252),
    "light navy" => array(21, 80, 132),
    "pink red" => array(245, 5, 79),
    "olive brown" => array(100, 84, 3),
    "poop brown" => array(122, 89, 1),
    "mustard green" => array(168, 181, 4),
    "ocean green" => array(61, 153, 115),
    "very dark blue" => array(0, 1, 51),
    "dusty green" => array(118, 169, 115),
    "light navy blue" => array(46, 90, 136),
    "minty green" => array(11, 247, 125),
    "adobe" => array(189, 108, 72),
    "barney" => array(172, 29, 184),
    "jade green" => array(43, 175, 106),
    "bright light blue" => array(38, 247, 253),
    "light lime" => array(174, 253, 108),
    "dark khaki" => array(155, 143, 85),
    "orange yellow" => array(255, 173, 1),
    "ocre" => array(198, 156, 4),
    "maize" => array(244, 208, 84),
    "faded pink" => array(222, 157, 172),
    "british racing green" => array(5, 72, 13),
    "sandstone" => array(201, 174, 116),
    "mud brown" => array(96, 70, 15),
    "light sea green" => array(152, 246, 176),
    "robin egg blue" => array(138, 241, 254),
    "aqua marine" => array(46, 232, 187),
    "dark sea green" => array(17, 135, 93),
    "soft pink" => array(253, 176, 192),
    "orangey brown" => array(177, 96, 2),
    "cherry red" => array(247, 2, 42),
    "burnt yellow" => array(213, 171, 9),
    "brownish grey" => array(134, 119, 95),
    "camel" => array(198, 159, 89),
    "purplish grey" => array(122, 104, 127),
    "marine" => array(4, 46, 96),
    "greyish pink" => array(200, 141, 148),
    "pale turquoise" => array(165, 251, 213),
    "pastel yellow" => array(255, 254, 113),
    "bluey purple" => array(98, 65, 199),
    "canary yellow" => array(255, 254, 64),
    "faded red" => array(211, 73, 78),
    "sepia" => array(152, 94, 43),
    "coffee" => array(166, 129, 76),
    "bright magenta" => array(255, 8, 232),
    "mocha" => array(157, 118, 81),
    "ecru" => array(254, 255, 202),
    "purpleish" => array(152, 86, 141),
    "cranberry" => array(158, 0, 58),
    "darkish green" => array(40, 124, 55),
    "brown orange" => array(185, 105, 2),
    "dusky rose" => array(186, 104, 115),
    "melon" => array(255, 120, 85),
    "sickly green" => array(148, 178, 28),
    "silver" => array(197, 201, 199),
    "purply blue" => array(102, 26, 238),
    "purpleish blue" => array(97, 64, 239),
    "hospital green" => array(155, 229, 170),
    "shit brown" => array(123, 88, 4),
    "mid blue" => array(39, 106, 179),
    "amber" => array(254, 179, 8),
    "easter green" => array(140, 253, 126),
    "soft blue" => array(100, 136, 234),
    "cerulean blue" => array(5, 110, 238),
    "golden brown" => array(178, 122, 1),
    "bright turquoise" => array(15, 254, 249),
    "red pink" => array(250, 42, 85),
    "red purple" => array(130, 7, 71),
    "greyish brown" => array(122, 106, 79),
    "vermillion" => array(244, 50, 12),
    "russet" => array(161, 57, 5),
    "steel grey" => array(111, 130, 138),
    "lighter purple" => array(165, 90, 244),
    "bright violet" => array(173, 10, 253),
    "prussian blue" => array(0, 69, 119),
    "slate green" => array(101, 141, 109),
    "dirty pink" => array(202, 123, 128),
    "dark blue green" => array(0, 82, 73),
    "pine" => array(43, 93, 52),
    "yellowy green" => array(191, 241, 40),
    "dark gold" => array(181, 148, 16),
    "bluish" => array(41, 118, 187),
    "darkish blue" => array(1, 65, 130),
    "dull red" => array(187, 63, 63),
    "pinky red" => array(252, 38, 71),
    "bronze" => array(168, 121, 0),
    "pale teal" => array(130, 203, 178),
    "military green" => array(102, 124, 62),
    "barbie pink" => array(254, 70, 165),
    "bubblegum pink" => array(254, 131, 204),
    "pea soup green" => array(148, 166, 23),
    "dark mustard" => array(168, 137, 5),
    "shit" => array(127, 95, 0),
    "medium purple" => array(158, 67, 162),
    "very dark green" => array(6, 46, 3),
    "dirt" => array(138, 110, 69),
    "dusky pink" => array(204, 122, 139),
    "red violet" => array(158, 1, 104),
    "lemon yellow" => array(253, 255, 56),
    "pistachio" => array(192, 250, 139),
    "dull yellow" => array(238, 220, 91),
    "dark lime green" => array(126, 189, 1),
    "denim blue" => array(59, 91, 146),
    "teal blue" => array(1, 136, 159),
    "lightish blue" => array(61, 122, 253),
    "purpley blue" => array(95, 52, 231),
    "light indigo" => array(109, 90, 207),
    "swamp green" => array(116, 133, 0),
    "brown green" => array(112, 108, 17),
    "dark maroon" => array(60, 0, 8),
    "hot purple" => array(203, 0, 245),
    "dark forest green" => array(0, 45, 4),
    "faded blue" => array(101, 140, 187),
    "drab green" => array(116, 149, 81),
    "light lime green" => array(185, 255, 102),
    "snot green" => array(157, 193, 0),
    "yellowish" => array(250, 238, 102),
    "light blue green" => array(126, 251, 179),
    "bordeaux" => array(123, 0, 44),
    "light mauve" => array(194, 146, 161),
    "ocean" => array(1, 123, 146),
    "marigold" => array(252, 192, 6),
    "muddy green" => array(101, 116, 50),
    "dull orange" => array(216, 134, 59),
    "steel" => array(115, 133, 149),
    "electric purple" => array(170, 35, 255),
    "fluorescent green" => array(8, 255, 8),
    "yellowish brown" => array(155, 122, 1),
    "blush" => array(242, 158, 142),
    "soft green" => array(111, 194, 118),
    "bright orange" => array(255, 91, 0),
    "lemon" => array(253, 255, 82),
    "purple grey" => array(134, 111, 133),
    "acid green" => array(143, 254, 9),
    "pale lavender" => array(238, 207, 254),
    "violet blue" => array(81, 10, 201),
    "light forest green" => array(79, 145, 83),
    "burnt red" => array(159, 35, 5),
    "khaki green" => array(114, 134, 57),
    "cerise" => array(222, 12, 98),
    "faded purple" => array(145, 110, 153),
    "apricot" => array(255, 177, 109),
    "dark olive green" => array(60, 77, 3),
    "grey brown" => array(127, 112, 83),
    "green grey" => array(119, 146, 111),
    "true blue" => array(1, 15, 204),
    "pale violet" => array(206, 174, 250),
    "periwinkle blue" => array(143, 153, 251),
    "light sky blue" => array(198, 252, 255),
    "blurple" => array(85, 57, 204),
    "green brown" => array(84, 78, 3),
    "bluegreen" => array(1, 122, 121),
    "bright teal" => array(1, 249, 198),
    "brownish yellow" => array(201, 176, 3),
    "pea soup" => array(146, 153, 1),
    "forest" => array(11, 85, 9),
    "barney purple" => array(160, 4, 152),
    "ultramarine" => array(32, 0, 177),
    "purplish" => array(148, 86, 140),
    "puke yellow" => array(194, 190, 14),
    "bluish grey" => array(116, 139, 151),
    "dark periwinkle" => array(102, 95, 209),
    "dark lilac" => array(156, 109, 165),
    "reddish" => array(196, 66, 64),
    "light maroon" => array(162, 72, 87),
    "dusty purple" => array(130, 95, 135),
    "terra cotta" => array(201, 100, 59),
    "avocado" => array(144, 177, 52),
    "marine blue" => array(1, 56, 106),
    "teal green" => array(37, 163, 111),
    "slate grey" => array(89, 101, 109),
    "lighter green" => array(117, 253, 99),
    "electric green" => array(33, 252, 13),
    "dusty blue" => array(90, 134, 173),
    "golden yellow" => array(254, 198, 21),
    "bright yellow" => array(255, 253, 1),
    "light lavender" => array(223, 197, 254),
    "umber" => array(178, 100, 0),
    "poop" => array(127, 94, 0),
    "dark peach" => array(222, 126, 93),
    "jungle green" => array(4, 130, 67),
    "eggshell" => array(255, 255, 212),
    "denim" => array(59, 99, 140),
    "yellow brown" => array(183, 148, 0),
    "dull purple" => array(132, 89, 126),
    "chocolate brown" => array(65, 25, 0),
    "wine red" => array(123, 3, 35),
    "neon blue" => array(4, 217, 255),
    "dirty green" => array(102, 126, 44),
    "light tan" => array(251, 238, 172),
    "ice blue" => array(215, 255, 254),
    "cadet blue" => array(78, 116, 150),
    "dark mauve" => array(135, 76, 98),
    "very light blue" => array(213, 255, 255),
    "grey purple" => array(130, 109, 140),
    "pastel pink" => array(255, 186, 205),
    "very light green" => array(209, 255, 189),
    "dark sky blue" => array(68, 142, 228),
    "evergreen" => array(5, 71, 42),
    "dull pink" => array(213, 134, 157),
    "aubergine" => array(61, 7, 52),
    "mahogany" => array(74, 1, 0),
    "reddish orange" => array(248, 72, 28),
    "deep green" => array(2, 89, 15),
    "vomit green" => array(137, 162, 3),
    "purple pink" => array(224, 63, 216),
    "dusty pink" => array(213, 138, 148),
    "faded green" => array(123, 178, 116),
    "camo green" => array(82, 101, 37),
    "pinky purple" => array(201, 76, 190),
    "pink purple" => array(219, 75, 218),
    "brownish red" => array(158, 54, 35),
    "dark rose" => array(181, 72, 93),
    "mud" => array(115, 92, 18),
    "brownish" => array(156, 109, 87),
    "emerald green" => array(2, 143, 30),
    "pale brown" => array(177, 145, 110),
    "dull blue" => array(73, 117, 156),
    "burnt umber" => array(160, 69, 14),
    "medium green" => array(57, 173, 72),
    "clay" => array(182, 106, 80),
    "light aqua" => array(140, 255, 219),
    "light olive green" => array(164, 190, 92),
    "brownish orange" => array(203, 119, 35),
    "dark aqua" => array(5, 105, 107),
    "purplish pink" => array(206, 93, 174),
    "dark salmon" => array(200, 90, 83),
    "greenish grey" => array(150, 174, 141),
    "jade" => array(31, 167, 116),
    "ugly green" => array(122, 151, 3),
    "dark beige" => array(172, 147, 98),
    "emerald" => array(1, 160, 73),
    "pale red" => array(217, 84, 77),
    "light magenta" => array(250, 95, 247),
    "sky" => array(130, 202, 252),
    "light cyan" => array(172, 255, 252),
    "yellow orange" => array(252, 176, 1),
    "reddish purple" => array(145, 9, 81),
    "reddish pink" => array(254, 44, 84),
    "orchid" => array(200, 117, 196),
    "dirty yellow" => array(205, 197, 10),
    "orange red" => array(253, 65, 30),
    "deep red" => array(154, 2, 0),
    "orange brown" => array(190, 100, 0),
    "cobalt blue" => array(3, 10, 167),
    "neon pink" => array(254, 1, 154),
    "rose pink" => array(247, 135, 154),
    "greyish purple" => array(136, 113, 145),
    "raspberry" => array(176, 1, 73),
    "aqua green" => array(18, 225, 147),
    "salmon pink" => array(254, 123, 124),
    "tangerine" => array(255, 148, 8),
    "brownish green" => array(106, 110, 9),
    "red brown" => array(139, 46, 22),
    "greenish brown" => array(105, 97, 18),
    "pumpkin" => array(225, 119, 1),
    "pine green" => array(10, 72, 30),
    "charcoal" => array(52, 56, 55),
    "baby pink" => array(255, 183, 206),
    "cornflower" => array(106, 121, 247),
    "blue violet" => array(93, 6, 233),
    "chocolate" => array(61, 28, 2),
    "greyish green" => array(130, 166, 125),
    "scarlet" => array(190, 1, 25),
    "green yellow" => array(201, 255, 39),
    "dark olive" => array(55, 62, 2),
    "sienna" => array(169, 86, 30),
    "pastel purple" => array(202, 160, 255),
    "terracotta" => array(202, 102, 65),
    "aqua blue" => array(2, 216, 233),
    "sage green" => array(136, 179, 120),
    "blood red" => array(152, 0, 2),
    "deep pink" => array(203, 1, 98),
    "grass" => array(92, 172, 45),
    "moss" => array(118, 153, 88),
    "pastel blue" => array(162, 191, 254),
    "bluish green" => array(16, 166, 116),
    "green blue" => array(6, 180, 139),
    "dark tan" => array(175, 136, 74),
    "greenish blue" => array(11, 139, 135),
    "pale orange" => array(255, 167, 86),
    "vomit" => array(162, 164, 21),
    "forrest green" => array(21, 68, 6),
    "dark lavender" => array(133, 103, 152),
    "dark violet" => array(52, 1, 63),
    "purple blue" => array(99, 45, 233),
    "dark cyan" => array(10, 136, 138),
    "olive drab" => array(111, 118, 50),
    "pinkish" => array(212, 106, 126),
    "cobalt" => array(30, 72, 143),
    "neon purple" => array(188, 19, 254),
    "light turquoise" => array(126, 244, 204),
    "apple green" => array(118, 205, 38),
    "dull green" => array(116, 166, 98),
    "wine" => array(128, 1, 63),
    "powder blue" => array(177, 209, 252),
    "off white" => array(255, 255, 228),
    "electric blue" => array(6, 82, 255),
    "dark turquoise" => array(4, 92, 90),
    "blue purple" => array(87, 41, 206),
    "azure" => array(6, 154, 243),
    "bright red" => array(255, 0, 13),
    "pinkish red" => array(241, 12, 69),
    "cornflower blue" => array(81, 112, 215),
    "light olive" => array(172, 191, 105),
    "grape" => array(108, 52, 97),
    "greyish blue" => array(94, 129, 157),
    "purplish blue" => array(96, 30, 249),
    "yellowish green" => array(176, 221, 22),
    "greenish yellow" => array(205, 253, 2),
    "medium blue" => array(44, 111, 187),
    "dusty rose" => array(192, 115, 122),
    "light violet" => array(214, 180, 252),
    "midnight blue" => array(2, 0, 53),
    "bluish purple" => array(112, 59, 231),
    "red orange" => array(253, 60, 6),
    "dark magenta" => array(150, 0, 86),
    "greenish" => array(64, 163, 104),
    "ocean blue" => array(3, 113, 156),
    "coral" => array(252, 90, 80),
    "cream" => array(255, 255, 194),
    "reddish brown" => array(127, 43, 10),
    "burnt sienna" => array(176, 78, 15),
    "brick" => array(160, 54, 35),
    "sage" => array(135, 174, 115),
    "grey green" => array(120, 155, 115),
    "white" => array(255, 255, 255),
    "robin's egg blue" => array(152, 239, 249),
    "moss green" => array(101, 139, 56),
    "steel blue" => array(90, 125, 154),
    "eggplant" => array(56, 8, 53),
    "light yellow" => array(255, 254, 122),
    "leaf green" => array(92, 169, 4),
    "light grey" => array(216, 220, 214),
    "puke" => array(165, 165, 2),
    "pinkish purple" => array(214, 72, 215),
    "sea blue" => array(4, 116, 149),
    "pale purple" => array(183, 144, 212),
    "slate blue" => array(91, 124, 153),
    "blue grey" => array(96, 124, 142),
    "hunter green" => array(11, 64, 8),
    "fuchsia" => array(237, 13, 217),
    "crimson" => array(140, 0, 15),
    "pale yellow" => array(255, 255, 132),
    "ochre" => array(191, 144, 5),
    "mustard yellow" => array(210, 189, 10),
    "light red" => array(255, 71, 76),
    "cerulean" => array(4, 133, 209),
    "pale pink" => array(255, 207, 220),
    "deep blue" => array(4, 2, 115),
    "rust" => array(168, 60, 9),
    "light teal" => array(144, 228, 193),
    "slate" => array(81, 101, 114),
    "goldenrod" => array(250, 194, 5),
    "dark yellow" => array(213, 182, 10),
    "dark grey" => array(54, 55, 55),
    "army green" => array(75, 93, 22),
    "grey blue" => array(107, 139, 164),
    "seafoam" => array(128, 249, 173),
    "puce" => array(165, 126, 82),
    "spring green" => array(169, 249, 113),
    "dark orange" => array(198, 81, 2),
    "sand" => array(226, 202, 118),
    "pastel green" => array(176, 255, 157),
    "mint" => array(159, 254, 176),
    "light orange" => array(253, 170, 72),
    "bright pink" => array(254, 1, 177),
    "chartreuse" => array(193, 248, 10),
    "deep purple" => array(54, 1, 63),
    "dark brown" => array(52, 28, 2),
    "taupe" => array(185, 162, 129),
    "pea green" => array(142, 171, 18),
    "puke green" => array(154, 174, 7),
    "kelly green" => array(2, 171, 46),
    "seafoam green" => array(122, 249, 171),
    "blue green" => array(19, 126, 109),
    "khaki" => array(170, 166, 98),
    "burgundy" => array(97, 0, 35),
    "dark teal" => array(1, 77, 78),
    "brick red" => array(143, 20, 2),
    "royal purple" => array(75, 0, 110),
    "plum" => array(88, 15, 65),
    "mint green" => array(143, 255, 159),
    "gold" => array(219, 180, 12),
    "baby blue" => array(162, 207, 254),
    "yellow green" => array(192, 251, 45),
    "bright purple" => array(190, 3, 253),
    "dark red" => array(132, 0, 0),
    "pale blue" => array(208, 254, 254),
    "grass green" => array(63, 155, 11),
    "navy" => array(1, 21, 62),
    "aquamarine" => array(4, 216, 178),
    "burnt orange" => array(192, 78, 1),
    "neon green" => array(12, 255, 12),
    "bright blue" => array(1, 101, 252),
    "rose" => array(207, 98, 117),
    "light pink" => array(255, 209, 223),
    "mustard" => array(206, 179, 1),
    "indigo" => array(56, 2, 130),
    "lime" => array(170, 255, 50),
    "sea green" => array(83, 252, 161),
    "periwinkle" => array(142, 130, 254),
    "dark pink" => array(203, 65, 107),
    "olive green" => array(103, 122, 4),
    "peach" => array(255, 176, 124),
    "pale green" => array(199, 253, 181),
    "light brown" => array(173, 129, 80),
    "hot pink" => array(255, 2, 141),
    "black" => array(0, 0, 0),
    "lilac" => array(206, 162, 253),
    "navy blue" => array(0, 17, 70),
    "royal blue" => array(5, 4, 170),
    "beige" => array(230, 218, 166),
    "salmon" => array(255, 121, 108),
    "olive" => array(110, 117, 14),
    "maroon" => array(101, 0, 33),
    "bright green" => array(1, 255, 7),
    "dark purple" => array(53, 6, 62),
    "mauve" => array(174, 113, 129),
    "forest green" => array(6, 71, 12),
    "aqua" => array(19, 234, 201),
    "cyan" => array(0, 255, 255),
    "tan" => array(209, 178, 111),
    "dark blue" => array(0, 3, 91),
    "lavender" => array(199, 159, 239),
    "turquoise" => array(6, 194, 172),
    "dark green" => array(3, 53, 0),
    "violet" => array(154, 14, 234),
    "light purple" => array(191, 119, 246),
    "lime green" => array(137, 254, 5),
    "grey" => array(146, 149, 145),
    "sky blue" => array(117, 187, 253),
    "yellow" => array(255, 255, 20),
    "magenta" => array(194, 0, 120),
    "light green" => array(150, 249, 123),
    "orange" => array(249, 115, 6),
    "teal" => array(2, 147, 134),
    "light blue" => array(149, 208, 252),
    "red" => array(229, 0, 0),
    "brown" => array(101, 55, 0),
    "pink" => array(255, 129, 192),
    "blue" => array(3, 67, 223),
    "green" => array(21, 176, 26),
    "purple" => array(126, 30, 156),
);