0004522: Case sensitive autoload

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Category

Severity

Reproducibility

Date Submitted

Last Update

0004522

[Quercus]

major

always

04-27-11 11:52

Reporter

tokeefe

View Status

public

Assigned To

Priority

normal

Resolution

open

Status

new

Product Version

4.0.11

Summary

0004522: Case sensitive autoload

Description

The Quercus implementation of "class_exists()" appears to lowercase the incoming string, then pass this string to __autoload() and cache the result of __autoload.

If a custom __autoload() function uses this incoming string to load a PHP file from disk -- where case can matter -- the cached __autoload result can cause issues. All subsequent attempts to call class_exists(), depending on that function to autoload the file will fail even if one later uses the correct case.

To test the issue, create a file (a class) Foo/Bar/Biz.php

Then create an __autoload method similar to the following e.g.,

31 function __autoload($name=null)
33 {
34 $class = explode("\\", $name);
35 $class = implode("/", $class);
36
37 $path = dirname(__FILE__) . "/../..";
38 $fullfile = "$path/$class.php";
39
40 if(!file_exists($fullfile))
41 throw new ClassException(ClassException::CLASS_NOT_FOUND, $name);
42
43 include_once($fullfile);
44 }

Then call class_exists() with both incorrect and correct case (in that order):

class_exists("Foo\Bar\biz");
class_exists("Foo\Bar\Biz");

Since the first invocation of class_exists() fails and the result is cached, the subsequent invocation will also fail until you reboot the webserver. This issue is especially evident when using a tokenized URL (input by the client) to load Controllers/Views a la Zend Framework.

Temporary workaround:

Do not let class_exists() attempt the __autoload by passing false as the second argument. Simply call autoload manually e.g.,

117 if(! class_exists($name, false))
118 __autoload($name);

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Issue History
Date Modified	Username	Field	Change
04-27-11 11:52	tokeefe	New Issue
04-30-11 07:23	kdecherf	Issue Monitored: kdecherf

Mantis 1.0.0rc3[^]

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