php - Variable not returning -


this complete mystery me. have function loops through data query. trying gather data variable rows table. however, variable not return. can echo it, not return it. variable $table_rows within while loop. 

function show_data($result) {  $total_time = 0;  $table_rows = '<table style="width: 1200px;"><tr><th width="30%">date</th><th width="10%">hour</th><th width="10%">business</th><th width="40%">task</th><th width="10%">time</th></tr>';  if ( mysqli_num_rows($result) > 0) {      // output data of each row     while($row = mysqli_fetch_assoc($result)) {           $total_time += $row["total_time"];          $hours = floor($row["total_time"] / 3600);          $mins = floor($row["total_time"] / 60 % 60);          $table_rows .= '<tr><td>'.$row['date'].'</td><td>'.$row["hour_done"].'</td><td>'.$row["business"].'</td><td>' . $row["task"]. '</td><td>' . $hours.':'.$mins.'</td></tr>';      }      $hours = floor($total_time / 3600);      $mins = floor($total_time / 60 % 60);      return $table_rows . '<tr><td colspan="4" align="right"><b>total time</b></td><td><b>'.$hours.':'.$mins.'</b></td></table>'; }  else {     return "false"; } } if( show_data($result) != "false") {     echo show_data($result); } else { echo "<h1>no data display</h1>"; }

if echo $table_rows right outside while loop displays, when return it, empty.

looks it's using same result set twice , not resetting cursor in between calls (i.e. first time $result ok, second time it's @ end of results. instead: 

$table = show_data($result); if ($table != "false") {     echo $table; }

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