How can I use PHP to query the values returned by mysql?

How can I use PHP to query the values returned by mysql, for example, how many queries I have returned? & nbsp; select & nbsp; count (*) & nbsp; from & nbsp; csdn; the number of directly returned results in mysql, such as 2039. In PHP, how can I display this result to the page? how can I use PHP to query the value returned by mysql?
For example, how many select count (*) from csdn statements are queried;

The number of directly returned results in mysql, such as 2039.

How can I display this result on the page in PHP?

I use mysql_fetch_row to return an array. which function should be used for implementation.
------ Solution --------------------

$ Rs = mysql_query ('SELECT count (*) from csdn ');
$ Row = mysql_fetch_row ($ rs );
Echo $ row [0];