Formatting output

Hello, I would like to format the output of a PHP page into a single line and use gzip compression too. I know that i can use something like this to get in a single line ( will workout on this function later to remove spaces ). <?php function my_function( $buffer ) { $str = str_replace( "\n" , " " , $buffer ); return $str; } ob_start("my_function"); echo 'hello'; ob_end_flush(); ?> And gzip compression is used with <?php ob_start("ob_gzhandler"); echo 'hello'; ob_end_flush(); ?> Is there a way to "mix" those codes? Thanks.