Session problems or something else

[cmgmyr]

I have a users page that has this in it:

[code=php:0]function GetRandomChar() {
mt_srand((double)microtime()*1000000);
$IMGVER_RandVal = mt_rand(1,3);

switch ($IMGVER_RandVal) {
case 1:
$IMGVER_RandVal = mt_rand(97, 122);
break;
case 2:
$IMGVER_RandVal = mt_rand(48, 57);
break;
case 3:
$IMGVER_RandVal = mt_rand(65, 90);
break;
}
return chr($IMGVER_RandVal);
}
function register_form(){
        global $db, $prefix, $name, $email, $username, $password, $user_taken_err, $email_taken_err, $name_taken_err, $type;
if($type == "f"){
$nameout = "Your";
}elseif($type == "b"){
$nameout = "Band";
}else{
$nameout = "Your";
$type = "f";
}

session_start();

$IMGVER_TempString="";

for ($i = 1; $i <= 6; $i++) {
  $IMGVER_TempString .= GetRandomChar();
}

$HTTP_SESSION_VARS["IMGVER_RndText"] = $IMGVER_TempString;
$IMGVER_RandomText = $HTTP_SESSION_VARS["IMGVER_RndText"];

echo "<div style=\"text-align:center;\"><span class=\"title\">Registration form</span><br />";
echo "Fields marked with a * are required.
      <form id=\"RegisterForm\" method=\"post\" action=\"users.php\">
      <table style=\"margin:0 auto;width:400px;\" border=\"0\" id=\"table1\" cellpadding=\"2\">
<tr>
<td style=\"text-align:right;width:50%;\">$nameout Name:</td>
<td style=\"text-align:left;width:50%;\"><input type=\"text\" name=\"name\" size=\"20\" value=\"$name\" /> * $name_taken_err</td>
</tr>
<tr>
  <td style=\"text-align:right;\">E-Mail:</td>
  <td style=\"text-align:left;\"><input type=\"text\" name=\"email\" size=\"20\" value=\"$email\" /> * $email_taken_err</td>
    </tr>
<tr>
  <td style=\"text-align:right;\">&nbsp;</td>
  <td>&nbsp;</td>
    </tr>
<tr>
<td style=\"text-align:right;\">Username:</td>
<td style=\"text-align:left;\"><input type=\"text\" name=\"username\" size=\"18\" value=\"$username\" /> * $user_taken_err</td>
</tr>
<tr>
<td style=\"text-align:right;\">Password:</td>
<td style=\"text-align:left;\"><input type=\"password\" name=\"password\" size=\"18\" value=\"$password\" /> *</td>
</tr>
<tr>
  <td align=\"right\">Verify Image:</td>
  <td align=\"left\"><img src=\"doimg.php?"; echo SID."\" /><br /><input name=\"verify\" type=\"text\" id=\"verify\"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td><input type=\"submit\" value=\"Register\" />
<input type=\"hidden\" name=\"cmg\" value=\"do_Register\" />
<input type=\"hidden\" name=\"type\" value=\"$type\" /></td>
</tr>
</table></form>[ <a href=\"users.php\" title=\"Back\">Back</a> ]</div>";
}[/code]


here is doimg.php

[code=php:0]<?php
$IMGVER_IMAGE = imagecreate(150,40);

$IMGVER_COLOR_BLACK = imagecolorallocate ($IMGVER_IMAGE, 0, 0, 0);
$IMGVER_COLOR_WHITE = imagecolorallocate ($IMGVER_IMAGE, 255, 255, 255);

imagefill($IMGVER_IMAGE, 0, 0, $IMGVER_COLOR_BLACK);

session_start();
$IMGVER_RandomText = $HTTP_SESSION_VARS["IMGVER_RndText"];

imagechar($IMGVER_IMAGE, 4, 20, 13, $IMGVER_RandomText[0] ,$IMGVER_COLOR_WHITE);
imagechar($IMGVER_IMAGE, 5, 40, 13, $IMGVER_RandomText[1] ,$IMGVER_COLOR_WHITE);
imagechar($IMGVER_IMAGE, 3, 60, 13, $IMGVER_RandomText[2] ,$IMGVER_COLOR_WHITE);
imagechar($IMGVER_IMAGE, 4, 80, 13, $IMGVER_RandomText[3] ,$IMGVER_COLOR_WHITE);
imagechar($IMGVER_IMAGE, 5, 100, 13, $IMGVER_RandomText[4] ,$IMGVER_COLOR_WHITE);
imagechar($IMGVER_IMAGE, 3, 120, 13, $IMGVER_RandomText[5] ,$IMGVER_COLOR_WHITE);

header("Content-type: image/jpeg");
imagejpeg($IMGVER_IMAGE);
?>[/code]

I have used this same thing on a contact page and it works fine. When I go to register now there is just a blank black box. When I go to the contact page, that image loads fine, when I go back to register the same code appears as the contact page I was just on.

Am I missing something? Do you need any other code to look at?

Thanks,
-Chris

[onlyican]

the image is being cached

Common problem, simply stop that image, or the whole page from being cached

[cmgmyr]

Right, but the initial problem is that when you first go to the registration page, there is nothing in the image. There wouldn't be any caching problems if it was actually generating something...which it's not.