Edit report at https://bugs.php.net/bug.php?id=60475&edit=1
ID: 60475
User updated by: ctrahey at rubicon dot com
Reported by: ctrahey at rubicon dot com
Summary: Assignments of $this in some implicit __toString
contexts get broken
Status: Open
Type: Bug
Package: Class/Object related
Operating System: Windows 7, Ubuntu 10
-PHP Version: 5.3.8
+PHP Version: 5.3.8, 5.4.0RC2, 5.5.0-dev
Block user comment: N
Private report: N
New Comment:
Tested against trunk (5.5.0-dev, revision 320923) compiled on Ubuntu 10.04.3
with same (incorrect) result.
Previous Comments:
------------------------------------------------------------------------
[2011-12-08 16:58:08] ctrahey at rubicon dot com
Description:
------------
Tested with php 5.3.8 on Windows 7, 5.4.0RC2 Win32, and 5.4.0RC2 (cli) on
Ubuntu 10.04.3
When an object is implicitly used as a string when passed to some php
functions, __toString is called as expected, but any assignments of $this from
within __toString are eventually broken and point instead to the string that
gets returned. This behavior occurs only in some php functions, and never if
you cast as string while passing into the functions.
This behavior has been observed when passing objects into at least these php
functions:
str_replace, preg_replace, preg_match_all, sprintf.
There are many php string functions that do not behave this way (they allow
__toString-created references to $this persist as references to the object).
For extra fun, play around with htmlspecialchars, echo-ing the output... I
suspect that's a whole different issue, but related (possible memory leak
there).
Test script:
---------------
<?php
class Primary {
public function __toString() {
$GLOBALS['anObject'] = $this;
return 'toString output from Primary';
}
}
$Foo = new Primary;
str_replace('', '', $Foo);
var_dump($GLOBALS['anObject']);
// expected to be object of class Primary, actually string
Expected result:
----------------
object(Primary)#1 (0) { }
Actual result:
--------------
string(28) "toString output from Primary"
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=60475&edit=1
