// 1
$chats = GetMessagesUsers($api['user']['user_id']);
foreach($chats as $api['recipient']) {
echo $api['recipient'];
}
// 2
$chat_groups = GetChatGroups();
foreach ($chat_groups as $api['group']) {
echo $api['group'];
}

[
{
"user_id": 1,
"username": "",
"email": "",
"password": "",
"first_name": "",
"last_name": "",
"avatar": "",
"time": 0000000000
}
][
{
"group_id": 1,
"user_id": 1,
"group_name": "",
"avatar": "",
"time": 1569050727
}
]