#27219 [Ver]: Unable to create static instance if no member vars are declared
ID: 27219
Updated by: sniper@php.net
Reported By: ivo at ibuildings dot nl
Status: Verified
Bug Type: Scripting Engine problem
-Operating System: Gentoo, Redhat 9
+Operating System: *
-PHP Version: 4.3.4
+PHP Version: 4CVS-2004-02-11
New Comment:
Works fine with latest PHP5 CVS checkout. Only borks in PHP 4.
Previous Comments:
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[2004-02-11 08:51:48] ivo at ibuildings dot nl
Sorry, browser autocomplete filled in wrong defaults.
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[2004-02-11 08:49:20] ivo at ibuildings dot nl
Description:
------------
When a class does not have member variables, creating a static instance
of the class becomes impossible. See the code below. If the member
variable is declared, one onstance is created, and each next call to
getInstance will return the existing instance.Without the member var,
new instances are created every time.
Reproduce code:
---------------
class mySingleton
{
// var $m_dummy = ""; // uncommenting this line is a
// workaround
function &getInstance()
{
static $s_instance = NULL;
if ($s_instance == NULL)
{
echo "Creating a new instance<br>";
$s_instance = new mySingleton();
}
else
{
echo "Using existing instance<br>";
}
return $s_instance;
}
}
$tmp = &mySingleton::getIntance();
$tmp2 = &mySingleton::getIntance();
Expected result:
----------------
Creating a new instance
Using existing instance
Actual result:
--------------
Creating a new instance
Creating a new instance
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Edit this bug report at http://bugs.php.net/?id=27219&edit=1
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