php - What is meaning of 0 in mysql_result($res, 0, "id");? -


I searched on Google but found nothing that could not help me! 

  $ Sql ​​= "From users where username = 'select ID'. Mysql_real_escape_string ($ u)." '"$ Res = mysql_query ($ sql); if (mysql_num_rows ($ res ) == 1) {$ id = mysql_result ($ res, 0, "id"); // Username id found}

represents 0? Represents the first line (as the array starts with index 0), I believe that it returns the first username id, no matter how much it is known.

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