สอบถามเกี่ยวกับการ random row ค๊ะ ด้านล่างนี้เป็นฟังก์ชัน captcha ที่หนูเขียนขึ้นค๊ะ

<?PHP
include("connect.php");
$sql = "SELECT * FROM captcha WHERE id = '3' order by id asc";
$result = mysql_query($sql);
$datas=mysql_fetch_array($result);{
$ask = stripslashes(str_replace('\r\n', '<br>',($datas['ask'])));
$ans = stripslashes(str_replace('\r\n', '<br>',($datas['ans'])));
$id = stripslashes(str_replace('\r\n', '<br>',($datas['id'])));
}
?>


<?php
if(isset($_POST["submit"]))
  {
    include("connect.php");
    $sql = "SELECT * FROM captcha WHERE id = '3' AND ans = '".$_POST["ans"]."' ";
    $query = mysql_query($sql);
    $result = mysql_fetch_array($query);
      if($result)
        {
   	  echo("TRUE");
        } 
      else
        {
	  echo("NOT TRUE");
        }
  }
?>









<div class="captcha">
<div id="allFields">
<div class="fields">
<form name="captcha" method="post" action="" ENCTYPE = "multipart/form-data" onsubmit="return checkform(this);">
<table class="billinginputs" cellpadding="0" cellspacing="0" style="width: 100%; padding: 5px 10px 10px 5px;">
            <tbody><tr>
	      <td class="label">
		<label style=" font-size: 14px; " >Captcha : <span class="mandatory">*</span</label>
	      </td>
	      <td class="field_left">
		<?PHP echo"$ask";?><input type="text" style=" font-size: 14px; " name="ans" value="">
	      </td>
	    </tr>
              <tr>
                <td class="label">
                  <input type="submit" name="submit" value="submit" />
                </td>
                <td class="field_left">
                </td>
              </tr>
            </tbody></table>
</form>
		</div>
	</div>
</div>

<?PHP
include("connect.php");
$query = "SELECT MAX(id) FROM captcha"; 	 
$result = mysql_query($query) or die(mysql_error());
// Print out result
while($row = mysql_fetch_array($result)){
$max_id = $row['MAX(id)'];
}




$ran_id =(rand(1,$max_id));




$sql = "SELECT * FROM captcha WHERE id = '$ran_id' order by id asc";
$result = mysql_query($sql);
$datas=mysql_fetch_array($result);{
$ask = stripslashes(str_replace('\r\n', '<br>',($datas['ask'])));
$ans = stripslashes(str_replace('\r\n', '<br>',($datas['ans'])));
$id = stripslashes(str_replace('\r\n', '<br>',($datas['id'])));
}
?>





<?php

if(isset($_POST["submit"]))
  {
    include("connect.php");
    $sql = "SELECT * FROM captcha WHERE id = '$ran_id' AND ans = '".$_POST["ans"]."' ";
    $query = mysql_query($sql);
    $result = mysql_fetch_array($query);
      if($result)
        {
          echo("TRUE");
        } 
      else
        {
	  echo("NOT TRUE");
        }
  }
?>









<div class="captcha">
<div id="allFields">
<div class="fields">
<form name="captcha" method="post" action="" ENCTYPE = "multipart/form-data" onsubmit="return checkform(this);">
<table class="billinginputs" cellpadding="0" cellspacing="0" style="width: 100%; padding: 5px 10px 10px 5px;">
            <tbody><tr>
	      <td class="label">
		<label style=" font-size: 14px; " >Captcha : <span class="mandatory">*</span</label>
	      </td>
	      <td class="field_left">
		<?PHP echo"$ask";?><input type="text" style=" font-size: 14px; " name="ans" value="">
	      </td>
	    </tr>
              <tr>
                <td class="label">
                  <input type="submit" name="submit" value="submit" />
                </td>
                <td class="field_left">
                </td>
              </tr>
            </tbody></table>
</form>
		</div>
	</div>
</div>