//Retrieves data from MySQL
$data = mysql_query("SELECT * FROM db*****") or die(mysql_error());

//Puts it into an array
while($info = mysql_fetch_array( $data ))
{
?>

        <div class="member">
        <div class="imageSection">
       <? 

        if($info['photo'] == '')
         {echo "<img class=\"memberImage\" src=images/default.jpg>";}
          else {echo "<img class=\"memberImage\" src=images/".$info['photo'] .">";}
         ?>
        </div>
        </div>

If the image source is not in the database a default image is displayed.

Display default image if not in database

mysql, php

PHP