PHP classes

I have tried understanding classes in PHP, but I am not even able to start writing a class for the below code:

$fieldnames=mysql_list_fields(fcsubscription,regular);
$fieldnames1=mysql_num_fields($fieldnames);
for ($index=0; $index < $fieldnames1; ++$index) {
   $mysql_fields[mysql_field_name($fieldnames, $index)]=$cleantake[mysql_field_name($fieldnames, $index)];
}


$subnames=mysql_list_fields(fcsubscription,sub_details);
$subnames1=mysql_num_fields($subnames);
echo "total number is ".$subnames1;
for($index=0;$index<$subnames1;++$index){
	$sub_fields[mysql_field_name($subnames,$index)]=$cleantake[mysql_field_name($subnames,$index)];
	}

PHP:

as you can see, I call for the field names from the database and then take values from an array based on the earlier retrieved field names. Now how do I go about writing a class with variables changing? If you could explain how a class could be created for this one line :$sub_fields[mysql_field_name($subnames,$index)]=$cleantake[mysql_field_name($subnames,$index)];
}

i think ill be able to manage with the others.

thanks