Dual output

<?php
    if(file_exists($page_path)){
        include($page_path);
    }else{
        ob_start("sanitize_all");}
?>
...HTML CODE...
<?php
    if(!file_exists($page_path)){
        $fp = fopen($page_path, 'w');
        fwrite($fp,ob_get_contents());
        fclose($fp);
        ob_end_flush();
    }
?>