I am trying to create a dynamic drop down list using PHP and mysql database. I have written the following code and its giving me the output, but the problem is that its show
<?php
$res = mysqli_query($conn, "SELECT DISTINCT coloumn_name FROM table_name;" );
while($row = mysqli_fetch_array($res))    
{
    echo "<option value='" . $row['selected_coloumn']. "'>" . $row['selected_coloumn'] . "</option>";
}
?>
In this example please select your 'coloumn_name' and 'table_name'.
You may try it
    $select_query=          "Select name from category";
    $select_query_run =     mysql_query($select_query);
    $select_query_array=   mysql_fetch_array($select_query_run)
    $select = "<select>";
    foreach ($select_query_array as $val)
    {
        $select .= "<option value='".$val['name']."' >".$val['name']."</option>"; 
    }
    $select = "</select>";
    echo $select;
Hope It will work
$select_query= "Select name from category";
$select_query_run =     mysql_query($select_query);
$selectTag = "<select>";
while   ($select_query_array=   mysql_fetch_array($select_query_run) ){
    foreach ($select_query_array as $select_query_display){
        $selectTag .="<option value='' >$select_query_display</option>";
    }
}
$selectTag .= "</select>";
   echo $selectTag;
                                                                        take look at this code.
$select_query=          "Select name from category";
$select_query_run =     mysql_query($select_query);
echo "<select>";
while   ($select_query_array=   mysql_fetch_array($select_query_run) )
{
        echo "<option value='' >".$select_query_array['name']."</option>";                        
}
echo "</select>";
                                                                        Get rid of the inner foreach loop... it is doing nothing for you and move the start and end select tags outside of the while loop.
$select_query=          "Select name from category";
$select_query_run =     mysql_query($select_query);
echo "<select name='category'>";
while ($select_query_array=   mysql_fetch_array($select_query_run) )
{
   echo "<option value='' >".htmlspecialchars($select_query_array["name"])."</option>";
}
echo "</select>";