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Php / phplib error

Posted on 2000-02-14
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Last Modified: 2008-03-17
have a problem with php/phplib. Every now and again i get

Warning: $user is not an object in page.inc on line 68

Fatal error: Member function used on a non-object in page.inc on line 68

On my pages. I am NOT using a variable named $user. I am doing a page_open and page_close on all pages (the error occurs in the page_close). Sometimes you can loose the error by closing all browser windows and restarting. Sometimes it shows on all pages, sometimes just on a few, or one. And most of the time it works just dandy.

If you would like to see my exact server config etc (aswell as some code snippet) please refer to the link below.

http://horde.tdyc.com/imp-0002/msg00283.html


Regards Jan.
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Question by:j2
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17 Comments
 
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Expert Comment

by:maxkir
Comment Utility
Try to insert debug code like echo $user before page_close() call. And add global $sess, $user in your functions:

<?php
function session_header($title) {
 global $sess, $user;
 page_open(array("sess" => "CS_Session", "user" => "CS_User"));
 echo "<html><head><title>\n";
 echo "$title\n";
 echo "</title>\n";
 echo "</head>\n";
 echo "<body bgcolor=\"#B07879\" background=\"http://localhost/images/cs-logo-fill2.jpg\" topmargin=\"0\" leftmargin=\"0\" style=\"font-family: Arial, sans-serif\" >\n";
  }
 

function session_footer() {
    global $sess, $user;
    echo '</body></html>';
    print $user;
    page_close();
  }
?>
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by:j2
Comment Utility
since footer is always called after header, do i need global directive in footer?
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Expert Comment

by:maxkir
Comment Utility
AFAIK, 'global' definition is local to the function it is used in. So you have always use global in functions/object methods. Another way to access globals variables - use $GLOBALS array.
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Expert Comment

by:aikon
Comment Utility
Hi j2,

If you only want use phplibs to manage sessions variables you don't need use
"user" => "CS_User" parameter.

My code looks like:
<?php
// $theVar is a session variable. It was registered with REGISTER function
// $theNewVar is a new session variable I'm going to register it
// mySessClass is my custom session class in local.inc file

 php_open(array("session"=>"mySessClass"));

 echo "TheVar= $theVar";
 $theNewVar = $theVar + 10;
 $mySessClass->register("theNewVar");

 php_close();
?>
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by:j2
Comment Utility
I think i wrote in the link i provided that i only added that since it was suggested by someone else, it makes no difference to my problem.

maxkir i dont think the global is the answer, since the use of global is not suggested anywhere in the phplib docs :-/
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Accepted Solution

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aikon earned 100 total points
Comment Utility
J2,

Be carefull with the PHP functions variables scope.

I have a look at your code, and I suggest you to don't open/close a session into a function because it could be only available into the function body.

Try this one:
<?php
 page_open(array("sess" => "CS_Session"));

 function session_header($title) {
  echo "<html><head><title>\n";
  echo "$title\n";
  echo "</title>\n";
  echo "</head>\n";
  echo "<body bgcolor=\"#B07879\" background=\"http://localhost/images/cs-logo-fill2.jpg\" topmargin=\"0\" leftmargin=\"0\" style=\"font-family: Arial, sans-serif\" >\n";
 }
 

 function session_footer() {
    echo '</body></html>';
 }

 page_close();
?>

Regards
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by:j2
Comment Utility
Will try wednesday / thursday.

Out of curiosity, what is the _real_ difference between your code and mine?

I think i am out of my league here :=)
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Expert Comment

by:aikon
Comment Utility
I put the php_open() and php_close()  outside of your functions.

Regards :)
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Expert Comment

by:maxkir
Comment Utility
Well, 'global' is not mentioned, but it is supposed to be used when you put your page_open/close code in functions - so, as aikon mentioned, you've changed variables scope.

Try adding 'global' just to make sure that I'm wrong ;-))). If you remove
"user"=>CS_User, it could bi simple
global $sess; in your  functions.

Good luck,
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Author Comment

by:j2
Comment Utility
Ah, now i see, rewriting the common inc in that fashion would make sure that each file that includes that file will get a page open and close.. I see. Now, if i would like to use another session setting i would just have to moce it to another common inc (or whatever filename) right?

This might very well work, but as i said, i wont have time to experiment until thursday prolly.

But i think i have seen the light :)
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Expert Comment

by:maxkir
Comment Utility
Just including common.inc will not do the trick.
When you make page_open, you read values of stored variables from DB,
when you do page_close, you save this values back to the DB. So you vave to call page_close  *after* changing of variables you want to store.
Code like this:

include("common.inc");
$var_to_store = "value";

will not work if you will not call page_close()  at the end.
So, common.inc shouldn't contain page_close() call.

You can do two ways (using code above):
<?php
include("common.inc");
$sess->register("var_to_store");
$var_to_store = "value";
session_footer();
page_close();
?>

OR ( if you leave page_close() in session_footer() )

<?php
include("common.inc");
$sess->register("var_to_store");
$var_to_store = "value";
session_footer();
?>

I'd do it this way:
<?php
include("common.inc");
session_header();
$sess->register("var_to_store");
$var_to_store = "value";
session_footer();
?>

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Author Comment

by:j2
Comment Utility
Gah, how shall i call this?

Aikon mentioned the scope of variables first (which was the problem).. but maxkir aswell gave valuable input.

But since i cant split the points, the winner must be aikon.

Hey maxkir, posting another question in a sec should be easy, but it got me scratching my head :=)
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Expert Comment

by:maxkir
Comment Utility
I suggest that 'global' statement resolves variable scope problem ;-)))
Anyway, most important thing that you've got a solution.
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LVL 12

Author Comment

by:j2
Comment Utility
Dang.. you're right.. yo uknow what, ill see if customer service can transfer some points to you. :)
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by:j2
Comment Utility
Gah.. the error just returned :(
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Expert Comment

by:maxkir
Comment Utility
In what configuration ?
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Author Comment

by:j2
Comment Utility
IE5.01sp1 which is probably the culprit, with the cache bug. After the redefinition of my functions the problem seems to have dissapeared for other browsers tho.
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