mysql - how to know when database became empty in php -

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i makin quiz in php , mysql . fetching questions database, suppose if don't know no of questions in datbase. want code fetch data till questions not over, don't no of questions there . condtion applicable . code fetching data . 

<?php   function ravi($qid=null)  {                            $con = mysql_connect('localhost', 'root', '') or          die(mysql_error());             $db = mysql_select_db('quiz', $con) or die(mysql_error());             $q="select * question qno=$qid";             $rq=mysql_query($q,$con);             if(!$rq)             {             echo " sql query faiiled work ";             }             else             {              while ($sub_row=mysql_fetch_array($rq))             {             $id=$sub_row["qno"];             $question=$sub_row["question"];             $option1=$sub_row["option1"];             $option2=$sub_row["option2"];             $option3=$sub_row["option3"];             $option4=$sub_row["option4"];               echo "<h5>q".$id." : ".$question."</br></h5>";                echo"</br>                 <br>                  <h4><input type= radio id='1' name=\"{$id}\" value=\"{$option1}\">$option1</h4>                 </br>                  <h4><input type= radio id='2' name=\"{$id}\" value=\"{$option2}\">$option2</h4>                 </br>                  <h4><input type= radio id='3' name=\"{$id}\" value=\"{$option3}\">$option3</h4>                 </br>                  <h4><input type= radio id='4' name=\"{$id}\" value=\"{$option4}\">$option4</h4>                 </br></br>";                 }           }}                      ?> 

if (mysql_num_rows($rq) == 0) {     echo "database empty."; }

but should stop using mysql_* has been said in comments.


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