How to store arrays into sessions? 2

[Joulius]

Hi there!
I'm using Apache/1.3.14 (Win32) + PHP Version 4.3.2-RC1 locally.
I have a page that reads 2 files from 2 folders and stores them into arrays. Now, I want to pass that sessions to another page and display the arrays.
Here's the code from first page:

<?
session_start();
$emailDir="./email/";
$messageDir="./message/";
$dire=opendir($emailDir);
$dirm=opendir($messageDir);
while (false !== ($fe = readdir($dire))){
	if(is_file($emailDir.$fe)){
		$fecontents = file($emailDir.$fe);
		$i=0;
		while (list($line_numE, $lineE) = each ($fecontents)) {
			if(ereg("([_a-zA-Z0-9-]+)@([a-zA-Z0-9-]+)\.([a-zA-Z0-9-]{2,})",$lineE)){
		    	$email[$i]=$lineE;
				$i++;
			}
		}
		unlink($emailDir.$fe);
	}
}
while (false !== ($fm = readdir($dirm))){
	if(is_file($messageDir.$fm)){
		$fmcontents = file($messageDir.$fm);
		$message=$fmcontents;
		unlink($messageDir.$fm);
	}
}
session_register("EMAIL");
session_register("MESSAGE");
$eml=array_unique($email);
$EMAIL=$eml;
$MESSAGE=$message;
?>

And here's the second page:

<?
session_start();
if((!session_is_registered("EMAIL"))or(!session_is_registered("MESSAGE"))){
	header("Location: start.php");
	exit;
}
$eml=$EMAIL;
$cntEml=count($eml);
$msg=$MESSAGE;
$cntMsg=count($msg);
echo "Email list:<br>";
for($i=0;$i<$cntEml;$i++){
 echo $i." ".$eml[$i]."<br>";
}
echo "The message:<br>";
for($j=0;$j<$cntMsg;$j++){
 echo $msg[$j];
}
?>

Locally, it works great, but on web hosting doesn't work at all. It displays both sessions as empty.
The strange thing is that <? phpinfo() ?> doesn't seem to work on that hosting, so I don't know what version is their PHP, so, if anyone have any ideea, it's my code wrong?
The PHP version from that hosting could be the problem?

 

[sleipnir214]

PHP's variable names are case-sensitive, and I don't see variables named $MESSAGE or $EMAIL anywhere in your code.

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[shaddow]

Session_register should create the $MESSAGE and $EMAIL variables.

Also i see here a programming error due to the diferences of the windows php and linux php config files.

Using $email on the line
$eml=array_unique($email); will give empty value cuz the $email variable it's defined local in the while code block

what i mean it's this.

$i=0;
{
$j=100;
}
$i=$j;

If the php doesnt treat whole variables as globals $i wont be 100.

Bad english here but i think i've made my point.


________
George, M
Searches(faq333-4906),Carts(faq333-4911)

 

[sleipnir214]

shaddow:

If you use session_register() on variable names that don't exist, yes, PHP will create them in the session. However, those variables will be empty.

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[shaddow]

Yes, it's empty cuz the $email and $message variable are local to while code block.
it should be something like

$email=array();
$messages=array();
...
while()
{
}
...
$EMAIL=$email;

Also if the register_globals is off then you can use

foreach($_POST as $key=>value)
  $$key=$value;
this gives you ability to access $varname instead of $_POST["varname"]

________
George, M
Searches(faq333-4906),Carts(faq333-4911)

 

[sleipnir214]

It will also be empty because in PHP $MESSAGE and $EMAIL are not the same variables as $message and $email.

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[shaddow]

minor mistake here
foreach($_POST as $key=>value)
should be
foreach($_POST as $key=>$value)

________
George, M
Searches(faq333-4906),Carts(faq333-4911)

 

[shaddow]

He uses $email as intermediar variable as i see from it's code and therefor to use it outside it's definition block it needs to define that in same block as the $EMAIL=$email which is exactly what i've sayed with this code

$email=array();
$messages=array();
...
while()
{
}
...
$EMAIL=$email;

________
George, M
Searches(faq333-4906),Carts(faq333-4911)

 

[sleipnir214]

shaddow:
Wait a minute.

While loop blocks do not have local variables in PHP. Only functions have local variables. Read here for more information.


Joulius:
There are known issues with using session_register(). You can have problems when register_globals is set to "off". I strongly recommend that instead of using session_register(), you instead instantiate elements inside the $_SESSION array directly.


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[shaddow]

Yes i see now what you ment, but i had some problems using variables in diferent code blocks. That's why i initialize my variables before just to avoid that.
Anyway using $_SESSION could not work on php < 4.1 as there is the older version $HTTP_SESSION_VARS...

Anyway my opinion is that better should make an simple php with <?echo phpinfo()?> and see if it has register_globals on and what version of php it has.
I've seen free PHP hosting with php < 4.1 and Mysql 3.35 or older.

________
George, M
Searches(faq333-4906),Carts(faq333-4911)

 

[sleipnir214]

shaddow:
It is always better to simply write your code with the assumption that register_globals will always be off. It causes less heartache.


Joulius:
I strongly recommend that you get away from using session_register(), session_is_registered(), and references to session variables in global contexts. If register_globals is set to "off", you're going to have problems.

In the first script, I recommend you replace:

session_register("EMAIL");
session_register("MESSAGE");
$eml=array_unique($email);
$EMAIL=$eml;
$MESSAGE=$message;

with

$_SESSION['EMAIL'] = array_unique($email);
$_SESSION['MESSAGE'] = $message;

In the second script, I recommend that you make the replacements I've shown in red:

<?
session_start();
if([red]!isset($_SESSION["EMAIL"])or !isset($_SESSION["MESSAGE"])[/red])
{
    header("Location: start.php");
    exit;
}
$eml=[red]$_SESSION['EMAIL'][/red];
$cntEml=count($eml);
$msg=[red]$_SESSION['MESSAGE'][/red];

If your version of PHP is older than 4.1.0, replace "$_SESSION" in my above recommendations with "$HTTP_SESSION_VARS"

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TANSTAAFL!!

 

[Joulius]

Thank you both!
It seems that PHP causes me more headaches than ASP.NET :S.