[TheRaGeLord]

What does this loop means?

1)

PHP код:

enum USER_DATA
{
    USER_ID,
    USER_NAME[ MAX_PLAYER_NAME ],
    USER_PASSWORD[ 129 ],
    USER_ADMIN,
    bool: USER_LOGGED_IN
};
new    User[ MAX_PLAYERS ][ USER_DATA ];
public OnPlayerConnect( playerid )
{
    for( new i; i < _: USER_DATA; ++i ) User[ playerid ][ USER_DATA: i ] = 0;
    // ...
    return 1;
} 


2)

PHP код:

stock DB_Escape(text[])
{
    new
        ret[80* 2],
        ch,
        i,
        j;
    while ((ch = text[i++]) && j < sizeof (ret))
    {
        if (ch == '\'')
        {
            if (j < sizeof (ret) - 2)
            {
                ret[j++] = '\'';
                ret[j++] = '\'';
            }
        }
        else if (j < sizeof (ret))
        {
            ret[j++] = ch;
        }
        else
        {
            j++;
        }
    }
    ret[sizeof (ret) - 1] = '\0';
    return ret;
} 


Can anyone tell me that what does these both loops mean?
as I'm not able to understand them.