Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Style/Color.php
public static function indexedColor($pIndex, $background = false)
    {
        // Clean parameter
        $pIndex = (int) $pIndex;

        // Indexed colors
        if (self::$indexedColors === null) {
            self::$indexedColors = [
                1 => 'FF000000', //  System Colour #1 - Black
                2 => 'FFFFFFFF', //  System Colour #2 - White
                3 => 'FFFF0000', //  System Colour #3 - Red
                4 => 'FF00FF00', //  System Colour #4 - Green
                5 => 'FF0000FF', //  System Colour #5 - Blue
                6 => 'FFFFFF00', //  System Colour #6 - Yellow
                7 => 'FFFF00FF', //  System Colour #7- Magenta
                8 => 'FF00FFFF', //  System Colour #8- Cyan
                9 => 'FF800000', //  Standard Colour #9
                10 => 'FF008000', //  Standard Colour #10
                11 => 'FF000080', //  Standard Colour #11
                12 => 'FF808000', //  Standard Colour #12
                13 => 'FF800080', //  Standard Colour #13
                14 => 'FF008080', //  Standard Colour #14
                15 => 'FFC0C0C0', //  Standard Colour #15
                16 => 'FF808080', //  Standard Colour #16
                17 => 'FF9999FF', //  Chart Fill Colour #17
                18 => 'FF993366', //  Chart Fill Colour #18
                19 => 'FFFFFFCC', //  Chart Fill Colour #19
                20 => 'FFCCFFFF', //  Chart Fill Colour #20
                21 => 'FF660066', //  Chart Fill Colour #21
                22 => 'FFFF8080', //  Chart Fill Colour #22
                23 => 'FF0066CC', //  Chart Fill Colour #23
                24 => 'FFCCCCFF', //  Chart Fill Colour #24
                25 => 'FF000080', //  Chart Line Colour #25
                26 => 'FFFF00FF', //  Chart Line Colour #26
                27 => 'FFFFFF00', //  Chart Line Colour #27
                28 => 'FF00FFFF', //  Chart Line Colour #28
                29 => 'FF800080', //  Chart Line Colour #29
                30 => 'FF800000', //  Chart Line Colour #30
                31 => 'FF008080', //  Chart Line Colour #31
                32 => 'FF0000FF', //  Chart Line Colour #32
                33 => 'FF00CCFF', //  Standard Colour #33
                34 => 'FFCCFFFF', //  Standard Colour #34
                35 => 'FFCCFFCC', //  Standard Colour #35
                36 => 'FFFFFF99', //  Standard Colour #36
                37 => 'FF99CCFF', //  Standard Colour #37
                38 => 'FFFF99CC', //  Standard Colour #38
                39 => 'FFCC99FF', //  Standard Colour #39
                40 => 'FFFFCC99', //  Standard Colour #40
                41 => 'FF3366FF', //  Standard Colour #41
                42 => 'FF33CCCC', //  Standard Colour #42
                43 => 'FF99CC00', //  Standard Colour #43
                44 => 'FFFFCC00', //  Standard Colour #44
                45 => 'FFFF9900', //  Standard Colour #45
                46 => 'FFFF6600', //  Standard Colour #46
                47 => 'FF666699', //  Standard Colour #47
                48 => 'FF969696', //  Standard Colour #48
                49 => 'FF003366', //  Standard Colour #49
                50 => 'FF339966', //  Standard Colour #50
                51 => 'FF003300', //  Standard Colour #51
                52 => 'FF333300', //  Standard Colour #52
                53 => 'FF993300', //  Standard Colour #53
                54 => 'FF993366', //  Standard Colour #54
                55 => 'FF333399', //  Standard Colour #55
                56 => 'FF333333', //  Standard Colour #56
            ];
        }

        if (isset(self::$indexedColors[$pIndex])) {
            return new self(self::$indexedColors[$pIndex]);
        }

        if ($background) {
            return new self(self::COLOR_WHITE);
        }

        return new self(self::COLOR_BLACK);
    }
public static function indexedColor($pIndex, $background = false)
    {
        // Clean parameter
        $pIndex = (int) $pIndex;

        // Indexed colors
        if (self::$indexedColors === null) {
            self::$indexedColors = [
                1 => 'FF000000', //  System Colour #1 - Black
                2 => 'FFFFFFFF', //  System Colour #2 - White
                3 => 'FFFF0000', //  System Colour #3 - Red
                4 => 'FF00FF00', //  System Colour #4 - Green
                5 => 'FF0000FF', //  System Colour #5 - Blue
                6 => 'FFFFFF00', //  System Colour #6 - Yellow
                7 => 'FFFF00FF', //  System Colour #7- Magenta
                8 => 'FF00FFFF', //  System Colour #8- Cyan
                9 => 'FF800000', //  Standard Colour #9
                10 => 'FF008000', //  Standard Colour #10
                11 => 'FF000080', //  Standard Colour #11
                12 => 'FF808000', //  Standard Colour #12
                13 => 'FF800080', //  Standard Colour #13
                14 => 'FF008080', //  Standard Colour #14
                15 => 'FFC0C0C0', //  Standard Colour #15
                16 => 'FF808080', //  Standard Colour #16
                17 => 'FF9999FF', //  Chart Fill Colour #17
                18 => 'FF993366', //  Chart Fill Colour #18
                19 => 'FFFFFFCC', //  Chart Fill Colour #19
                20 => 'FFCCFFFF', //  Chart Fill Colour #20
                21 => 'FF660066', //  Chart Fill Colour #21
                22 => 'FFFF8080', //  Chart Fill Colour #22
                23 => 'FF0066CC', //  Chart Fill Colour #23
                24 => 'FFCCCCFF', //  Chart Fill Colour #24
                25 => 'FF000080', //  Chart Line Colour #25
                26 => 'FFFF00FF', //  Chart Line Colour #26
                27 => 'FFFFFF00', //  Chart Line Colour #27
                28 => 'FF00FFFF', //  Chart Line Colour #28
                29 => 'FF800080', //  Chart Line Colour #29
                30 => 'FF800000', //  Chart Line Colour #30
                31 => 'FF008080', //  Chart Line Colour #31
                32 => 'FF0000FF', //  Chart Line Colour #32
                33 => 'FF00CCFF', //  Standard Colour #33
                34 => 'FFCCFFFF', //  Standard Colour #34
                35 => 'FFCCFFCC', //  Standard Colour #35
                36 => 'FFFFFF99', //  Standard Colour #36
                37 => 'FF99CCFF', //  Standard Colour #37
                38 => 'FFFF99CC', //  Standard Colour #38
                39 => 'FFCC99FF', //  Standard Colour #39
                40 => 'FFFFCC99', //  Standard Colour #40
                41 => 'FF3366FF', //  Standard Colour #41
                42 => 'FF33CCCC', //  Standard Colour #42
                43 => 'FF99CC00', //  Standard Colour #43
                44 => 'FFFFCC00', //  Standard Colour #44
                45 => 'FFFF9900', //  Standard Colour #45
                46 => 'FFFF6600', //  Standard Colour #46
                47 => 'FF666699', //  Standard Colour #47
                48 => 'FF969696', //  Standard Colour #48
                49 => 'FF003366', //  Standard Colour #49
                50 => 'FF339966', //  Standard Colour #50
                51 => 'FF003300', //  Standard Colour #51
                52 => 'FF333300', //  Standard Colour #52
                53 => 'FF993300', //  Standard Colour #53
                54 => 'FF993366', //  Standard Colour #54
                55 => 'FF333399', //  Standard Colour #55
                56 => 'FF333333', //  Standard Colour #56
            ];
        }

        if (isset(self::$indexedColors[$pIndex])) {
            return new self(self::$indexedColors[$pIndex]);
        }

        if ($background) {
            return new self(self::COLOR_WHITE);
        }

        return new self(self::COLOR_BLACK);
    }
Get indexed color.

@param int $pIndex Index entry point into the colour array
@param bool $background Flag to indicate whether default background or foreground colour
should be returned if the indexed colour doesn't exist

@return Color