Array Row Span Table

<?php
$qresult = array(['kotaa', 'sd1'],['kotaa','sd2'],['kotab','sd3'], ['kotab','sd4'], ['kotab','sd5']);

$cities = array();
foreach($qresult as $city){
      if(!array_key_exists($city[0], $cities)){
            $cities[$city[0]] = array();
            $cities[$city[0]][] = $city[1];
     } else {
            $cities[$city[0]][]  = $city[1];
     }
}
echo "<table>";
foreach($cities as $key => $city){
   foreach($city as $innerkey => $school){
        if($innerkey == 0){
            echo "<tr><td rowspan =".sizeof($city).">$key</td><td>$school</td></tr>";
        } else {
            echo "<tr><td>$school</td></tr>";
        }
    }
}
echo "</table>";