Only allow betting if user is in a match

includes/functions.php

@@ -741,6 +741,32 @@ function user_is_member($userid, $season, $league)
 	$db->sql_freeresult($result);
 }
 
+/**
+* Is user allowed to bet this matchday
+*/
+function user_is_allowed_to_bet($userid, $season, $league, $matchday)
+{
+	global $db;
+    $sql = 'SELECT COUNT(*) AS counter
+        FROM  ' . FOOTB_MATCHES . "
+        WHERE season = $season
+            AND league = $league + 50
+            AND matchday = $matchday
+            AND (team_id_home = $userid + 2000 OR team_id_guest = $userid + 2000)";
+	$result = $db->sql_query($sql);
+	$row = $db->sql_fetchrow($result);
+
+	if ($row['counter'] > 0)
+	{
+		return  true;
+	}
+	else
+	{
+		return  false;
+	}
+	$db->sql_freeresult($result);
+}
+
 /**
 * Count existing matches on matchday or league
 */