colorize function in PHP

colorize.php

<?php

function colorize($str, $fg = 'white', $bg = false)
{
    $fg = str_replace(array('-','_'), '', $fg);
    switch($fg) {
    case 'black': $fg = "0;30"; break;
    case 'yellow': $fg = "1;33"; break;
    case 'brown': $fg = "0;33"; break;
    case 'green': $fg = "0;32"; break;
    case 'lightgreen': $fg = "1;32"; break;
    case 'blue': $fg = "0;34"; break;
    case 'lightblue': $fg = "1;34"; break;
    case 'dark_grey': $fg = "1;30"; break;
    case 'lightgrey': $fg = "0;37"; break;
    case 'cyan': $fg = "0;36"; break;
    case 'lightcyan': $fg = "1;36"; break;
    case 'red': $fg = "0;31"; break;
    case 'lightred': $fg = "1;31"; break;
    case 'purple': $fg = "0;35"; break;
    case 'lightpurple': $fg = "1;35"; break;
    case 'white':
    default:
        $fg = "1;37";
    }

    switch($bg) {
    case 'black': $bg = "40"; break;
    case 'red': $bg = "41"; break;
    case 'green': $bg = "42"; break;
    case 'yellow': $bg = "43"; break;
    case 'blue': $bg = "44"; break;
    case 'magenta': $bg = "45"; break;
    case 'cyan': $bg = "46"; break;
    case 'light_grey': $bg = "47"; break;
    default:
    }

    return "\033[{$fg}m".
            ($bg ? "\033[{$bg}m" : '').
            $str ."\033[0m\n";
}