[Dayrion]

Color in a message should by in hexadecimal : {RRGGBB}
In a function like SendClientMessage, it's heaxdecimal too but with Alpha values: 0xRRGGBBAA

Example:
0xFF0000FF -> Red
{0000ff} -> Blue

PHP код:

SendClientMessage(playerid, 0xFF0000FF, "This is red and this {0000ff}blue");