$q='select stuff from tbl';
$rawdata=sselect($q);
...
...

inc/fun.inc

function sselect($q) {
$ddb = conndb();          //connect to db
$rawdata = mysqli_prepare($ddb, $q);
//qres('prep', $rawdata);
$res = mysqli_stmt_execute($rawdata);
//qres('exec', $res);

return ($rawdata);
}

[Thu Apr 21 21:13:48.148495 2016] [core:notice] [pid 1294] AH00051: child pid 7148 exit signal 
Segmentation fault (11), possible coredump in /etc/apache2

 while (mysqli_stmt_fetch($rawdata)) {
        echo "$capid<br>";
    }