... [php]function checksys($str){ $syskey = array(' AND ',' OR ',' NOT ',' AND_NOT ',' XOR ',' NEAR ',' ADJ '); $str = str_replace($syskey,' ',' '.$str.' '); $ta = explode('.',trim($str).'.'); $i = 0; $str = ''; foreach($ta as $t){ if(is_string($t) && strlen($t)>1 && is_string($ta[($i+1...