FAQ
From: pear-qa at lists dot php dot net
Operating system: Irrelevant
PHP version: 5.0.0b4 (beta4)
PHP Bug Type: XML_XPath
Bug description: Assignment to $this

Description:
------------
## from the PEAR QA team ##
## quality-assurance related ##
## PHP 5 compatibility issue ##

Dear package maintainer,

your package makes use of the assignement of new values to $this. This
methodis possible in PHP 4 but will throw an error with PHP 5 [1]. Please
take care of this issue forPHP5 compatibility reasons.

Please answer to this bugreport directly through the PEAR bug tracker or
the mailinglist pear-qa@lists.php.net .

With kind regards,
PEAR QA Team

[1] http://www.php.net/ChangeLog-5.php#5.0.0b4

Reproduce code:
---------------
FILE: '/php/pear/XML_XPath/XPath.php' :
/php/pear/XML_XPath/XPath.php(101): $this = $result;
/php/pear/XML_XPath/XPath.php(276): $this = null;

FILE: '/php/pear/XML_XPath/XPath/result.php' :
/php/pear/XML_XPath/XPath/result.php(508): $this = null;

Expected result:
----------------
Solutions:

The assignment to $this occurs mostly inside constructors
(<Your_Package_Name>()). You should provide an static factory() or
singleton() method for this.

To provide backwards compatibility you should work around the affected
code pieces. This can be done by a version check:

if (version_compare(phpversion(), "5.0.0") == -1) {
// assign factoried method to this for PHP 4
// $this =& <Your_Package_Name>::factory();
$this =& <Your_Package_Name>::singleton();
} else {
// error handling for PHP5
// user has to use the factory()/singleton() method
}

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