[bigcomfycouch]

pawn Code:

new const BadWords[][] = {
    "shit",
    "fuck"
};

public OnPlayerText(playerid, text[])
{
    new placeholder;
    for(new i = 0; i < sizeof BadWords; i++)
    {
        placeholder = strfind(text, BadWords[i], true);
        if(placeholder != -1)
        {
            for(new x = placeholder; x < placeholder + strlen(BadWords[i]); x ++)
            {
                text[x] = '*';
            }
        }
    }
    return 1;
}