PHP Operation Mysql_fetch_row with Mysql_fetch_assoc's line don't understand hey

PHP Operation Mysql_fetch_row and MYSQL_FETCH_ASSOC a line don't understand hey

mysql_fetch_assoc-getting a row from the result set as an associative array
mysql_fetch_row-a row from the result set as an enumerated array
Gets a row from the result set is this the first row or a random row in the result set?
------to solve the idea----------------------
mysql_fetch_assoc-returns an array (array (' ID ' =>2, ' name ' = ' abc ', ' Sex ' =>0));
mysql_fetch_row-returns an array (Array (2, ' abc ', 0));

Do you understand me?
------to solve the idea----------------------
Take a line from the position of the pointer, and then the pointer + +.
All rows in the result set are exhausted, and if you want to take the first row again, you need to restore the pointer to line NO. 0, Mysql_data_seek
------to solve the idea----------------------
Get the first row of data from the result set, not randomly!

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