PHP Sessions

tolosenc · 09-01-2011 02:51PM #1

Hi there,

I'm a relatively experienced coder, but not in PHP!

Basically, there is a section of the site I'm working on at the moment that requires that a) the user is not colourblind and b) that their screen is displaying colours reasonably accurately.

I have a mysql database of the classic colour blindness tests (the dots with a number in them) stored with an image_id, a filename, and a correct(which is the correct response.

<?php

include('mysql.php');

$query="SELECT * FROM blindness ORDER BY RAND() LIMIT 0,3";
$result = @mysql_query($query);

while($row = mysql_fetch_object($result)) {
	$images[] = (object) $row;
}

session_start();

$_SESSION['file1']=$images[0]->correct;
$_SESSION['file2']=$images[1]->correct;
$_SESSION['file3']=$images[2]->correct;

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Colour Test</title>
</head>

<body>
<form action="cb-eval.php" method="get" name="cb">
<table border="0">
  <tr>
    <td valign="top" class="image"><img src="<?=$images[0]->filename?>" width="144" height="135" /></td>
    <td valign="top" class="image"><img src="<?=$images[1]->filename?>" width="144" height="135" /></td>
    <td valign="top" class="image"><img src="<?=$images[2]->filename?>" width="144" height="135" /></td>
  </tr>
  <tr>
    <td><center><input name="img1" type="text" /></center></td>
    <td><center><input name="img2" type="text" /></center></td>
    <td><center><input name="img3" type="text" /></center></td>
  </tr>
  <tr>
    <td></td>
    <td><center><input name="submit" type="submit" value="Go!" /></center></td>
    <td></td>
  </tr>
</table>
</form>
</body>
</html>

I worked out from cb-eval that the values I'm putting into the $_SESSION variables aren't being received. Basically, I want to compare file1 to img1(etc.) in cb-eval.php

Any ideas?

Freddio · 09-01-2011 05:02PM

session_start(); ....

... should be the first line of code in every php file that is calling or setting session variables.

Also are you sure they are being populated in the first place ?

tolosenc · 09-01-2011 06:50PM

Yeah, moving the session_start(); to the beginning was it. Cheers!

PHP Sessions

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