$replace = array("kelime1", "kelime2", "kelime3", "kelime4", "kelime5", "kelime6");

foreach($replace AS $try){
                $pos = strpos ($keys[1], $try);
                if ($pos !== false) {
                     break; 
                }  
else {
fwrite($fh, $povratak_fje);
fclose($fh);
}
}