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Session errors 3

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ZOR

ZOR

Technical User
Jan 30, 2002
2,963
GB
Can someone be good enough to point out why I am getting the following error.

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /home/R2D2/public_html/Digi.php:7) in /home/data8251/public_html/Digi.php on line 7

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/R2D2/public_html/Digi.php:7) in /home/data8251/public_html/Digi.php on line 7

The page code is:

<!DOCTYPE html

PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"

<?php session_start(); // This connects to the existing session
session_register ("DB6"); // Create a session variable called name
$HTTP_SESSION_VARS ["DB6"] = $name; // Set name = form variable $name
?>



<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"></meta>
<html xmlns=" xml:lang="en" lang="en">
<title>Submission Form</title>

</head>


<body>


<table class="Fatscope" width="84%" border="1">


<tr>
<td class="DescriptorCell" width="96%" bgcolor="#E7EFF7" colspan="4"><b>
<font face="Arial" size="5" color="#0000FF">Fuji D321 Digital Betacam</font></b></td>
</tr>


<tr>
<td class="DescriptorCell" width="34%" bgcolor="#E7EFF7"><b>
<font face="Arial" size="4">Product</font></b></td>
<td class="DescriptorCell" bgcolor="#E7EFF7" width="25%"><b>
<font face="Arial" size="4">Duration</font></b></td>
<td class="ContentCell" width="5%" bgcolor="#E7EFF7" align="center">
<b><font face="Arial" size="4">Qty</font></b></td>
<td class="ContentCell" width="32%" bgcolor="#E7EFF7">
&nbsp;</td>
</tr>


<tr>
<td class="DescriptorCell" width="34%" bgcolor="#FFFFFF" height="26">
<font face="Arial"><b>DBC-6</b></font></td>
<td class="DescriptorCell" bgcolor="#FFFFFF" height="26" width="25%">
<font face="Arial"><b>6mins</b></font></td>
<td class="ContentCell" width="5%" bgcolor="#FFFFFF" height="26">
<p align="center"><font size="3">
<input name="DB6" size="5" tabindex="1" style="background-color: #FFFF00"></font>

<td class="ContentCell" width="32%" bgcolor="#FFFFFF" rowspan="3" align="center">
&nbsp;</td>
</tr>


<tr>
<td class="DescriptorCell" width="34%" bgcolor="#FFFFFF">
&nbsp;</td>
<td class="DescriptorCell" bgcolor="#FFFFFF" width="25%">
&nbsp;</td>
<td class="ContentCell" width="5%" bgcolor="#FFFFFF">
<p align="center">
&nbsp;</td>
</tr>


<tr>
<td class="DescriptorCell" width="34%" bgcolor="#FFFFFF">
&nbsp;</td>
<td class="DescriptorCell" bgcolor="#FFFFFF" width="25%">
&nbsp;</td>
<td class="ContentCell" width="5%" bgcolor="#FFFFFF">
<p align="center">
&nbsp;</td>
</tr>



</table>


</body>
</html>


If I can follow the structure of this then I will use it for all the other pages I am now trying to hold tegether with php. Many thanks
 
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Dimensions a variable"? "control"? The first step toward thinking in PHP is to quit using all the ASP jargon.

session_start();
Starts the session-handling mechanism.
$_SESSION ['DB6V'];
Actually, this line is redundant and should be removed.
$_SESSION ['DB6V'] = $DB6;
This line creates and element in the array $_SESSION with the index DB6B and copies the value from the variable $DBV6 into it.

Have you verified that the value you expect is in $DB6? Or are you just assuming. If this value is supposed to come from data from a form element named "DB6", then with a default PHP installation $DB6 will not exist. One of $_POST['DB6'] or $_GET['DB6'] will, depending on whether your HTML form uses the POST- or GET-method, respectively.

The reason why the variable $DB6 will not exist in a default PHP installation is explained in the PHP online manual: Chapter 29: Using Register Globals

I also cover this in my FAQ titled "Debugging PHP": faq434-2999

The following works on my installation:

test_session1.html:
Code: 
<html><body>
<form method="POST" action="test_session1.php">
<input type="text" name="foo"><br>
<input type="submit">
</form>
</body></html>

test_session1.php:
Code: 
<?php
session_start();

$_SESSION['foo'] = $_POST['foo'];

print '<html><body>
<a href="test_session2.php">click here</a>
</body></html>';
?>

test_session2.php:
Code: 
<?php
session_start();

print '<html><body>The value of foo is: ' . $_SESSION['foo'] . '</body></html>';
?>

If I point my browser to test_session1.html, I get a form with one field and a submit. If I fill in hello in that field and submit, I get a link. If I click on that link, I get:

The value of foo is: hello


Want the best answers? Ask the best questions!

TANSTAAFL!!
 
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Many thanks sleipnir214, I have tried that at my end and it works. What I now need to try is this. I need to go from a menu page to a version of your test_session1.html page. From there go to a version of your test_session1.php page, but not stop there, but to move back to the menu page. There the user will select another version of your test_session1.html page etc, etc. Then at the end, obviuosly having added all the version additions of $_SESSION['foo'] = $_POST['foo']; etc along the line, will I then still be able to go to test_session2.php to get all the results out. Does it look feaseable. If so I'm on my way at last. Thanyou again for all the time.
 
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There is no rule that says each part of a web application must be separate files. I've been using separate script files in my examples here because I needed to simplify the scripts as much as possible for pedagogical reasons.

Try this script on for size. It doesn't matter what you name it.

Code: 
<?php
session_start();

if (!isset($_SESSION['foo']))
{
	$_SESSION['foo'] = array();
}

if (isset($_POST['foo']))
{
	if (strlen($_POST['foo']) > 0)
	{
		$_SESSION['foo'][] = $_POST['foo'];
	}
}

if (isset ($_POST['todelete']))
{
	foreach ($_POST['todelete'] as $key_to_delete)
	{
		unset ($_SESSION['foo'][$key_to_delete]);
	}
}


print '<html><body><form method="POST" action="' . $_SERVER['PHP_SELF'] . '">';

if (count($_SESSION['foo']) > 0)
{
	print 'The session variable "foo" currently contains:<br>
<table>
	<tr>
		<td>
			DEL?
		<td>
			&nbsp;';

	foreach ($_SESSION['foo'] as $key => $value)
	{
		print '
	<tr>
		<td>
			<input type="checkbox" name="todelete[]" value="' . $key . '">
		<td>
			' . $value;
	}

	print '</table>';
}
else
{
	print 'The session variable "foo" is empty.<br>';
}

print '<hr>
Add a value: <input type="text" name="foo"><br>
<input type="submit">
</form>
</body></html>';

?>


Want the best answers? Ask the best questions!

TANSTAAFL!!
 
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Its good when you know what your doing. Very impressive, informative. I am beginning to see what you mean regarding the scope of PHP. I am at last getting towards what I was looking for with your help. I have adopted you method of using "Post", and it seems to be making sense at last. I am able to go from a menu, to a page with input boxes, and return to the menu again. When I go to your 3rd page test_session2.php, its there.
Very greatful to you. And a thanks to others comming in.
 
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