<? ob_start(); ?>Apache does NOT get this stuff : PHP is buffering it<? //apache does NOT parse this "< ?", PHP stops output buffering and continue php code interpretation//php parses ....?>PHP parses "? >", and does NOT send the following code to apache ... instead, PHP buffers itxhtml ...<? //apache still does NOT parse this "< ?", PHP parser stops buffering and interpret the following code//php parses ....echo od_get_contents(); //Now, php outputs the buffered content to apacheob_end_clean(); //cleans the buffer?>