Description:
------------
PHP 5 PCRE Bug!?

We have in our program a function to log all $GLOBALS variables. This function 
calls itself recursive to log all variables of a array and all its sub-arrays.

This function is working fine in PHP 4.0.1 and up to 4.3.10 (the highest of our 
test configuration.)

Since PHP5 (different versions) it was not working anymore when you call the function with $GLOBALS as 
parameter. The logfile contained only one line ...
|-> GLOBALS = Array

After some hours i go it working by replacing the preg_replace() function with
the ereg_replace() function.

The problem shows as follows:
After calling function preg_replace() the $GLOBALS array contails only 1 element
which is $GLOBALS. (i cheched it with count($GLOBALS);) after that the check 
is_array() is always returning "1" instead of true or false.

after replacing the ...
preg_replace("/\r*\n/", " ", $entry); 
... with  ...
ereg_replace("\n", " ", $entry); 
ereg_replace("\r", " ", $entry); 
... the function is working without problems. PHP must be configured correctly 
because this function preg_replace() is used very often in our program. This 
function is also workinf fine when called with any other array. Only when 
$GLOBALS is used to call this function it shows this behaviour.

We checked this behaviour with different PHP4.x (everything was working) and some versions of PHP5 (on all the same problem - last tested version 5.1.1). And also on different OS (Linux, MacOSX, WinXP, Win2000).



Reproduce code:
---------------
<?php
/*****************************************************************************/
/* This file is part of Tinned-Mail.                                         */
/*****************************************************************************/

array_log($GLOBALS);

function array_log($array, $level = 0){
    // create level space
    $level_space = "";
    for($i=0; $i < $level; $i++){
        $level_space .= "    ";
    }
    
    // print array entries 
    foreach($array as $key => $value){
        $entry = $value;
        $entry = preg_replace("/\r*\n/", " ", $entry);
        $entry2 = "$level_space|-> $key = $entry\n";
    	$FILE = fopen("array.log", "a");
    	fwrite($FILE, $entry2);
    	fclose($FILE);
    	echo is_array($value);
        if(is_array($value)){
            if($key == "GLOBALS"){ continue; }
            array_log($value, $level + 1);
        }
    }
}

?>

Expected result:
----------------
Logfile with PHP 5.1.1:
|-> GLOBALS = Array

Logfile with 4.x.x (as it should look like):
|-> HTTP_ENV_VARS = Array
    |-> DBROOT = /dev/null
    |-> BOOT_FILE = /boot/vmlinuz
    |-> HOSTNAME = mail
    |-> CONSOLE = /dev/console
    |-> LD_LIBRARY_PATH = :/lib
    .
    .
    .
|-> HTTP_POST_FILES = Array
|-> GLOBALS = Array
|-> GATEWAY_INTERFACE = CGI/1.1
|-> SERVER_PROTOCOL = HTTP/1.0
|-> REQUEST_METHOD = GET
|-> QUERY_STRING = 
.
.
.



Actual result:
--------------
Replace ...
$entry = preg_replace("/\r*\n/", " ", $entry);
... With ...
$entry = ereg_replace("\r", "", $entry);
$entry = ereg_replace("\n", " ", $entry);

After changing it to ereg_replace() it is working with PHP4.0.1, 4.3.10 and 5.1.1