PHP中mysql_fetch_array()和mysql_fetch_row()的区别

 最近在做PHP与数据库交互的project，急于求成，模仿了下例子就开始动手，结果误把mysql_fetch_array写成了mysql_fetch_row,囧事来了，发现返回的数组居然是index=>value的形式，而明明记得是field name=>value的哈，查手册才明白。
1. mysql_fetch_array的函数原型是
array mysql_fetch_array ( resource $result [, int $result_type= MYSQL_BOTH ] )
Returns an array that corresponds to the fetched row and moves the internal data pointer ahead.
The type of returned array depends on how result_type is defined. By using MYSQL_BOTH (default), you'll get an array with both associative and number indices. Using MYSQL_ASSOC, you only get associative indices (as mysql_fetch_assoc() works), using MYSQL_NUM, you only get number indices (as mysql_fetch_row() works).
2. 这就很明白了，若设定不同的参数，mysql_fetch_array()可以做到mysql_fetch_row()和mysql_fetch_assoc()的功能，而后两个函数就只接受第一个参数，返回的分别是associative=>value, index=>value的数组
3.MYSQL_BOTH是什么效果呢，测试了下
Sql: select firstname,lastname from table where id="c01";
$array=mysql_fetch_array($result,MYSQL_BOTH);
$array[0]和$array['firstname']一样