src/util/Console.php
public static function render_colored_string($string, $colored = true) {
        // TODO rework/refactor according to https://github.com/yiisoft/yii2/issues/746
        static $conversions = [
            '%y' => [self::FG_YELLOW],
            '%g' => [self::FG_GREEN],
            '%b' => [self::FG_BLUE],
            '%r' => [self::FG_RED],
            '%p' => [self::FG_PURPLE],
            '%m' => [self::FG_PURPLE],
            '%c' => [self::FG_CYAN],
            '%w' => [self::FG_GREY],
            '%k' => [self::FG_BLACK],
            '%n' => [0], // reset
            '%Y' => [self::FG_YELLOW, self::BOLD],
            '%G' => [self::FG_GREEN, self::BOLD],
            '%B' => [self::FG_BLUE, self::BOLD],
            '%R' => [self::FG_RED, self::BOLD],
            '%P' => [self::FG_PURPLE, self::BOLD],
            '%M' => [self::FG_PURPLE, self::BOLD],
            '%C' => [self::FG_CYAN, self::BOLD],
            '%W' => [self::FG_GREY, self::BOLD],
            '%K' => [self::FG_BLACK, self::BOLD],
            '%N' => [0, self::BOLD],
            '%3' => [self::BG_YELLOW],
            '%2' => [self::BG_GREEN],
            '%4' => [self::BG_BLUE],
            '%1' => [self::BG_RED],
            '%5' => [self::BG_PURPLE],
            '%6' => [self::BG_PURPLE],
            '%7' => [self::BG_CYAN],
            '%0' => [self::BG_GREY],
            '%F' => [self::BLINK],
            '%U' => [self::UNDERLINE],
            '%8' => [self::NEGATIVE],
            '%9' => [self::BOLD],
            '%_' => [self::BOLD],
        ];

        if ($colored) {
            $string = str_replace('%%', '% ', $string);
            foreach ($conversions as $key => $value) {
                $string = str_replace(
                    $key,
                    static::ansiFormatCode($value),
                    $string
                );
            }
            $string = str_replace('% ', '%', $string);
        } else {
            $string = preg_replace('/%((%)|.)/', '$2', $string);
        }

        return $string;
    }
public static function render_colored_string($string, $colored = true) {
        // TODO rework/refactor according to https://github.com/yiisoft/yii2/issues/746
        static $conversions = [
            '%y' => [self::FG_YELLOW],
            '%g' => [self::FG_GREEN],
            '%b' => [self::FG_BLUE],
            '%r' => [self::FG_RED],
            '%p' => [self::FG_PURPLE],
            '%m' => [self::FG_PURPLE],
            '%c' => [self::FG_CYAN],
            '%w' => [self::FG_GREY],
            '%k' => [self::FG_BLACK],
            '%n' => [0], // reset
            '%Y' => [self::FG_YELLOW, self::BOLD],
            '%G' => [self::FG_GREEN, self::BOLD],
            '%B' => [self::FG_BLUE, self::BOLD],
            '%R' => [self::FG_RED, self::BOLD],
            '%P' => [self::FG_PURPLE, self::BOLD],
            '%M' => [self::FG_PURPLE, self::BOLD],
            '%C' => [self::FG_CYAN, self::BOLD],
            '%W' => [self::FG_GREY, self::BOLD],
            '%K' => [self::FG_BLACK, self::BOLD],
            '%N' => [0, self::BOLD],
            '%3' => [self::BG_YELLOW],
            '%2' => [self::BG_GREEN],
            '%4' => [self::BG_BLUE],
            '%1' => [self::BG_RED],
            '%5' => [self::BG_PURPLE],
            '%6' => [self::BG_PURPLE],
            '%7' => [self::BG_CYAN],
            '%0' => [self::BG_GREY],
            '%F' => [self::BLINK],
            '%U' => [self::UNDERLINE],
            '%8' => [self::NEGATIVE],
            '%9' => [self::BOLD],
            '%_' => [self::BOLD],
        ];

        if ($colored) {
            $string = str_replace('%%', '% ', $string);
            foreach ($conversions as $key => $value) {
                $string = str_replace(
                    $key,
                    static::ansiFormatCode($value),
                    $string
                );
            }
            $string = str_replace('% ', '%', $string);
        } else {
            $string = preg_replace('/%((%)|.)/', '$2', $string);
        }

        return $string;
    }
Converts a string to ansi formatted by replacing patterns like %y (for yellow) with ansi control codes

Uses almost the same syntax as https://github.com/pear/Console_Color2/blob/master/Console/Color2.php
The conversion table is: ('bold' meaning 'light' on some
terminals). It's almost the same conversion table irssi uses.
<pre>
text      text            background
------------------------------------------------
%k %K %0    black     dark grey       black
%r %R %1    red       bold red        red
%g %G %2    green     bold green      green
%y %Y %3    yellow    bold yellow     yellow
%b %B %4    blue      bold blue       blue
%m %M %5    magenta   bold magenta    magenta
%p %P       magenta (think: purple)
%c %C %6    cyan      bold cyan       cyan
%w %W %7    white     bold white      white

%F     Blinking, Flashing
%U     Underline
%8     Reverse
%_,%9  Bold

%n     Resets the color
%%     A single %
</pre>
First param is the string to convert, second is an optional flag if
colors should be used. It defaults to true, if set to false, the
color codes will just be removed (And %% will be transformed into %)

@param string $string String to convert
@param boolean $colored Should the string be colored?
@return string