php - Whats the proper way to check if mysql_query() returned any results? -

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I tried what seemed like the most intuitive approach 

  $ query = "SELECT * FROM member WHERE user name = '$ _CLEAN [username]' and password = '$ _CLEAN [password]'"; $ Result = mysql_query ($ query); If ($ result) {...

but it is not working because mysql_query returns a real value, even if 0 rows are returned I basically want to execute only the arguments in that situation if I returned a line.

Use: 

  if (mysql_num_rows ($ result)) {// do stuff}

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