[PHP] sort() - Where did I go wrong?

[John Taylor-Johnston]

I'm having another problem with sort();

I want to treat $rbenquiry as a string, not as a numeral.

$mydata->RB could contain "1.2" ; "1.9" ; "1.1" ; "1.0" ; "1.0.8"

But if $rbenquiry ="1.0", my code spits out anything that begins as though it were 
="1". It should only display "1.1" or "1.0.8".

Where did I go wrong? How can I fix it?

Thanks for any help,
John

------- snip ------------
$rbenquiry ="1.0";

$enquiries = array();
$enquiry_list = array();

#... open $db & $ $table

while ($mydata = mysql_fetch_object($news))
{
  $mydata->RB = str_replace(" ;", ";", $mydata->RB);
  $mydata->RB = str_replace("; ", ";", $mydata->RB);
  $tempenquiries = explode(";", $mydata->RB);
  foreach ($tempenquiries as $singleenquiry)
  {
    if ($singleenquiry <> "")
    {
      array_push($enquiries, $singleenquiry);
      $enquiry_list[$singleenquiry][] = $mydata->id;
   }
  }
}

sort($enquiries);
#usort($enquiries, create_function('$a,$b','return strcasecmp($a,$b);'));

foreach (array_count_values ($enquiries) as $enquiry=>$count)
{

 if((strtolower(substr($enquiry, 0, 1)) == $rbenquiry))
 {

  echo "<tr bgcolor=\"#D3DCE3\">";
   echo "<th align=\"left\" colspan=\"2\"><a 
href=\"".$SCRIPT_NAME."?searchenquiry=".urlencode($enquiry)."\">".$enquiry."</a> 
<small>[&lt;--Search Entire Database]</small></th>";
   echo "<th align=\"right\" width=\"5%\" nowrap>(".$count." ";
    if($count > 1)
    {echo "records found/trouvés)";}
    else{echo "record found/trouvé)";}
   echo"</th></tr>\n";

   echo "<tr bgcolor=\"#F5F5F5\"><td>&nbsp;</td>";
   echo "<td align=\"left\">";
   $temp = "";
   foreach ($enquiry_list[$enquiry] as $rbid)
   {
   $temp .= "<a target=\"printwindow\" 
href=\"print.php?id=".urlencode($rbid)."\">".$rbid."</a>, ";
   }
   $temp = substr("$temp", 0, -2);
   echo "$temp</td>";
   echo "<td>&nbsp;</td>";
  echo "</tr>\n";
 }
}

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