[PHP] Sessions in classes dosn't work!?
How come that I cannot store a varible in the session when I do this
from within another object?
This is my code:
?php
session_start();
class MyClass {
function MyClass($state) {
if($state == page2) {
print([ . $foo . ]);
session_destroy();
} else {
session_register(foo);
$foo = Hello World!;
print(a href=\?state=page2\Click here/a\n);
}
}
}
new MyClass($state);
?
/watson
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Re: [PHP] Sessions in classes dosn't work!?
This is because $foo is local to the member functions of the class. declare global
$foo at the start of every function.
Andrey Hristov
IcyGEN Corporation
http://www.icygen.com
99%
- Original Message -
From: Thomas Watson [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, August 30, 2001 12:10 PM
Subject: [PHP] Sessions in classes dosn't work!?
How come that I cannot store a varible in the session when I do this
from within another object?
This is my code:
?php
session_start();
class MyClass {
function MyClass($state) {
if($state == page2) {
print([ . $foo . ]);
session_destroy();
} else {
session_register(foo);
$foo = Hello World!;
print(a href=\?state=page2\Click here/a\n);
}
}
}
new MyClass($state);
?
/watson
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Re: [PHP] Sessions in classes dosn't work!?
This is because $foo is local to the member functions of the class.
declare global $foo at the start of every function.
Ok thnx... it worked... but how do you then explain this?:
***
?php
class TestClass {
var $foo;
function setFoo($bar) {
$this-foo = $bar;
}
function getFoo() {
return $this-foo;
}
}
class TestClass2 {
function TestClass2($state) {
global $obj;
if($state == page2) {
print(TYPE: . gettype($obj) . br /\n);
print($obj-getFoo());
session_destroy();
} else {
session_register(obj);
$obj = new TestClass();
$obj-setFoo(Hello World!);
print(TYPE: . gettype($obj) . br /\n);
print(a href=\?state=page2\Click here/a\n);
}
}
}
session_start();
new TestClass2($state);
?
***
When I on page1 print(TYPE: . gettype($obj) . br /\n);
I get this output: TYPE: object
When I on page2 print(TYPE: . gettype($obj) . br /\n);
I get this output: TYPE: NULL
(and the linie saying print($obj-getFoo()); generates an error:
Fatal error: Call to a member function on a non-object in
/home/httpd/html/test/save_objects.php on line 27
(just so you know: I have no problems saving an object in the session when
it's done outside a class. It's when I do this from within a class that the
problem occurs)
/watson
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Re: [PHP] Sessions in classes dosn't work!?
Hmmm, it seems that obj is not saved to the session file.
I don't thik that before new is needed.
Also may the problem is in that you use the class contructor. When objects are saved
in session, and on other page you want to
wakeup them you must provide two methods for the class:
function __sleep(){
return array(r,l,p,m_id);
}
function __wakeup(){
$this-res_id=mysql_connnect(user,pass,host);
}
__sleep() (double under) is called before wrinting in session file. it returns names
(as strings) of variables which have to be
saved. Why not all, because you can have a $res_id of db_link which is meaningless to
save. __wakeup() is called when the object is
restored in memory. If you have $res_id you have to create it here, so the persistent
object after restoring to be as before saving.
Andrey Hristov
IcyGEN Corporation
http://www.icygen.com
99%
- Original Message -
From: Thomas Watson [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, August 30, 2001 2:18 PM
Subject: Re: [PHP] Sessions in classes dosn't work!?
This is because $foo is local to the member functions of the class.
declare global $foo at the start of every function.
Ok thnx... it worked... but how do you then explain this?:
***
?php
class TestClass {
var $foo;
function setFoo($bar) {
$this-foo = $bar;
}
function getFoo() {
return $this-foo;
}
}
class TestClass2 {
function TestClass2($state) {
global $obj;
if($state == page2) {
print(TYPE: . gettype($obj) . br /\n);
print($obj-getFoo());
session_destroy();
} else {
session_register(obj);
$obj = new TestClass();
$obj-setFoo(Hello World!);
print(TYPE: . gettype($obj) . br /\n);
print(a href=\?state=page2\Click here/a\n);
}
}
}
session_start();
new TestClass2($state);
?
***
When I on page1 print(TYPE: . gettype($obj) . br /\n);
I get this output: TYPE: object
When I on page2 print(TYPE: . gettype($obj) . br /\n);
I get this output: TYPE: NULL
(and the linie saying print($obj-getFoo()); generates an error:
Fatal error: Call to a member function on a non-object in
/home/httpd/html/test/save_objects.php on line 27
(just so you know: I have no problems saving an object in the session when
it's done outside a class. It's when I do this from within a class that the
problem occurs)
/watson
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To contact the list administrators, e-mail: [EMAIL PROTECTED]
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Re: [PHP] Sessions in classes dosn't work!?
Hmmm, it seems that obj is not saved to the session file.
I don't thik that before new is needed.
This is weird :) It worked when I removed the (thought that I tried that
;). Now I just can't remember why I put it there in the first place. I hope
it wasn't importent ... well I will proboply find out when some of the code
dosn't work.
Also may the problem is in that you use the class contructor. When
objects are saved in session, and on other page you want to wakeup them
you must provide two methods for the class:
function __sleep(){
return array(r,l,p,m_id);
}
function __wakeup(){
$this-res_id=mysql_connnect(user,pass,host);
}
__sleep() (double under) is called before wrinting in session file. it
returns names (as strings) of variables which have to be saved. Why not
all, because you can have a $res_id of db_link which is meaningless to
save. __wakeup() is called when the object is restored in memory. If
you have $res_id you have to create it here, so the persistent object
after restoring to be as before saving.
I knew about the __sleep() and __wakeup() but not about the returning of an
array containing the names of the varibles that needs to be stored. Cool
feature - Thanks for the tip :)
/watson
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