How do I find mysql_num_rows for an object.
This gives an error:
$query = mysql_query($sql) or die(mysql_error());
$row = mysql_fetch_object($query);
echo mysql_num_rows( $row );
Warning: mysql_num_rows() expects parameter 1 to be resource, object given
mysql_num_rows expects a result set resource (the set of results returned by mysql_query, ie. what is ending up in your $query variable), not on a single row.
This would work:
$result_set = mysql_query($sql) or die(mysql_error());
$num_rows = mysql_num_rows($result_set);
$row = mysql_fetch_object($result_set);
Your should pass the result of mysql_query to mysql_num_rows like this:
echo mysql_num_rows($query);
From Docs:
The result resource that is being evaluated. This result comes from a call to mysql_query().
More Info:
echo mysql_num_rows($query);
$query = mysql_query($sql) or die(mysql_error());
echo mysql_num_rows($query);
i.e. you need to pass the return value from mysql_query to mysql_num_rows.
Easy. According to manual page, which good programmers always refer to, one object contains one row.
While mysql_num_rows() works with result set resource.
Also I have to say that according to my experience there is very little use if such a function. I can barely find a case where you would need it.
