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Bug #26762 unserialize() produces lowercase classnames
Submitted: 2004-01-01 18:04 UTC Modified: 2004-01-02 06:44 UTC
From: mail at alexanderklein dot de Assigned: helly
Status: Closed Package: Class/Object related
PHP Version: 5.0.0RC1-dev OS: *
Private report: No CVE-ID:
 [2004-01-01 18:04 UTC] mail at alexanderklein dot de
Description:
------------
I use the __autoload($sClass) feature, and the $sClass 
names are always transmitted as is. With upper and
lower characters.

But when i cache a class with serialize and try
to unserialize, the $sClass names are only lowercase.

System 1
    System 	Windows NT 5.1
    Build Date 	Jan 1 2004 16:06:44
    Server API 	CGI/FastCGI
    PHP API 	20031224
    PHP Extension 	20020429
    Zend Extension 	90021012
    
System 2
    System 	Linux * 2.4.18 #1 SMP i686
    Build Date 	Dec 23 2003 04:48:50
    Server API 	Apache
    Virtual Directory Support 	disabled
    PHP API 	20031103
    PHP Extension 	20020429
    Zend Extension 	90021012



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 [2004-01-01 18:24 UTC] mail at alexanderklein dot de
A short sample script

STEP One:

function __autoload($sClass) {
    echo $sClass."<br>";
}

ini_set(
    'unserialize_callback_func',
    '__autoload'
);

class myTestWithUpper {
    public $test;
    protected function __sleep() {
        return array('test');
    }
}

file_put_contents(
    "./test.dat",
    serialize(
        new myTestWithUpper()
    )
);

STEP Two:

unserialize(
    file_get_contents ("./test.dat")
);
 [2004-01-01 19:42 UTC] iliaa@php.net
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

In php class names are not case sensitive and are stored in 
lowercase form internally. 
 [2004-01-01 20:21 UTC] mail at alexanderklein dot de
Ok, you say

> In php class names are not case sensitive and are 
> stored in lowercase form internally. 

but why does the __autoload() function not convert to 
lowercase if i make an instance like "new myTestWithUpper"?

this is a _little_ bit confusing :-(
 [2004-01-01 21:25 UTC] helly@php.net
Behavior is correct as you can see below:

marcus@zaphod /usr/src/php5 $ php -r 'class FOO{}$o=new FOO;var_dump(serialize($o));'
string(14) "O:3:"FOO":0:{}"

marcus@zaphod /usr/src/php5 $ php -r '$o=unserialize("O:3:\"FOO\":0:{}");var_dump($o);'
object(__PHP_Incomplete_Class)#1 (1) {
  ["__PHP_Incomplete_Class_Name"]=>
  string(3) "foo"
}

marcus@zaphod /usr/src/php5 $ php -r 'class FOO{}$o=unserialize("O:3:\"FOO\":0:{}");var_dump($o);'
object(FOO)#1 (0) {
}
 [2004-01-01 22:19 UTC] helly@php.net
Actually unserialized lowercases the classname. But we store the lowercased classname only in the hashtable while we preserver the casing for its real name.
 [2004-01-01 22:24 UTC] helly@php.net
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
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