Description
Using this method you can set multiple colors for your text.  Use a simple numeric array to determine their order and give  it to this function. Multiple colors will be  cycled by the options specified 'color_mode' option. The given array  will overwrite the existing color settings!
The following colors syntaxes are understood by this method: 
- "#ffff00" hexadecimal format (HTML style), with and without #. 
- "#08ffff00" hexadecimal format (HTML style) with alpha channel (08), with and without #. 
- array with 'r','g','b' and (optionally) 'a' keys, using int values. 
- a GD color special color (tiled,...). 
  A single color or an array of colors are allowed here.