[Konstantinos]

Since it returns 0 if the player's IP is not in the file and 1 if it is. We need to return some other value if the file was not opened to prevent any action.

PHP код:

stock CheckBan(ip[])
{
    new File: file = fopen("ban.cfg", io_read);
    if (!file) return -1;
    new string[20];
    while(fread(file, string))
    {
        if(strcmp(ip, string, true, strlen(ip)) == 0)
        {
            fclose(file);
            return 1;
        }
    }
    fclose(file);
    return 0;
} 


An example would be:

PHP код:

switch (CheckBan(player_ip)) // supposed "player_ip" stores the player's IP on connect.
{
    case -1:
    {
        // could not read from the file, send a notice to admins
    }
    case 1:
    {
        // banned; do something
    }
} 


However, I'd recommend you since you're new to scripting to try better and more efficient ways such as SQL or y_ini instead.