Description:
------------
The reproduce code will generate an array dump and should have the "[] => Zero" as the first element in the array.

I am running php 4.3.9.

configure line is: './configure' '--with-mysql=/usr/local/mysql' '--with-xml' '--with-curl=../../curl/curl-7.1' '--with-apache=../../apache/apache_1.3.31' '--with-openssl' '--with-zlib' '--enable-bcmath' '--enable-calendar' '--enable-dbx' '--enable-ftp' '--with-gd' '--with-mcrypt' '--with-mhash' '--enable-xslt' '--with-xslt-sablot=/usr/local/lib' '--with-expat-dir=/usr/local' '--with-iconv-dir=/usr/local' '--with-pear' '--with-jpeg-dir=/usr/lib' '--with-png-dir=/usr/lib' 

Reproduce code:
---------------
<?php
$x = array('01'=>'One','02'=>'Two');
$x = array('' => 'Zero') + $x;
print_r($x);
?>

Expected result:
----------------
I am expecting this:

Array ( [] => Zero [01] => One [02] => Two ) 

If I run this script: 

<?php
$x = array('01'=>'One','02'=>'Two');
$y = array('' => 'Zero') + $x;
print_r($y);
?>

I do get the expected result. (Note the use of $y as the union of the two arrays.)

Actual result:
--------------
Program returns this:

Array ( [01] => One [02] => Two [] => Zero )