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Subject: possible bug with static variables?
From: cellog@php.net (Greg Beaver)

Hi,

I have discovered some odd behavior with static variables, and wonder if 
it is a bug.  In both PHP4 and PHP5, the code below prints:

not registered, class pear_common
not registered, class archive_tar

I.e., because the PEAR function is called with $this->PEAR(), the static 
variable is reset as if the PEAR() function were re-defined!  Is this 
expected behavior?  I was under the impression that static declared a 
per-class static variable.

<?php
class PEAR {
     function PEAR($error_class = null)
     {
         static $registered = false;
         $classname = get_class($this);
         while ($classname && strcasecmp($classname, "pear")) {
             $destructor = "_$classname";
             if (method_exists($this, $destructor)) {
                 if (!$registered) {
                     echo 'not registered, class ' . get_class($this) . 
"\n";
                     $registered = true;
                 }
                 break;
             }
         }
     }
}

class PEAR_Common extends PEAR
{
     function PEAR_Common()
     {
         $this->PEAR();
     }

     function _PEAR_Common()
     {
     }
}

class Archive_Tar extends PEAR
{
     function Archive_Tar()
     {
         $this->PEAR();
     }

     function _Archive_Tar()
     {
     }
}

$a = &new PEAR;
$b = &new PEAR_Common;
$c = &new Archive_Tar;
?>