[Disowned]

This will allow you to check if a player is on a coach team, and what coach team they're on.

PHP Code:

int coach_terrorist = 0;
int coach_counterterror = 0;

//m_iCoachingTeam
//return 0 if not on team
//return 2 for Terrorist team
//return 3 for Counter Terror team.

int coachteam = GetEntProp(client, Prop_Send, "m_iCoachingTeam");
//Terrorist team
if(coachteam == CS_TEAM_T) {
    coach_terrorist++;
//Counter-terror team
} else if (coachteam == CS_TEAM_CT) {
    coach_counterterror++;
}