Description:
------------
i don't be sure if this is a bug, anyway i don't think it is logically acceptable.

*  A short script that reproduces the problem.
we developed a service structure, using webservice tech(php5.soap). most things went well as we'd expected till we decided to make one service script access another one. we have 3 seperate sites under construction in the same linux box, and maybe more sites coming. some services on one site will contact another on a second site, and we think this schema is easy to understand and develope.

scriptA.php makes an SoapClient->__call() to scriptB.php , which serves well using SoapServer class when called from an binary client programmed with c++. then scriptB.php blocked when it got to the line where session_start() resides.

when we commented out session_start(), scriptB.php worked out as fast as possible, but we lost support of session tech here, that is not acceptable as we designed.

btw, we tried other ways to solve this problem, but all failed at function session_start(). some of the methods are xml-rpc and fsocket(writing and recieving soap envelope handly or xml-rpc structures),pear-xml-rpc(pear's xml-rpc lib).

* The list of modules you compiled PHP with (your configure line).
 	 './configure' '--prefix=/usr/local/php' '--with-config-file-path=/usr/local/php' '--enable-sockets' '--with-apxs2=/usr/local/apache/bin/apxs' '--with-mysql=/usr/local/mysql' '--enable-track-vars' '--enable-static' '--enable-roxen-zts' '--with-gd' '--with-zlib' '--with-xml' '--with-gettext' '--with-ttf' '--enable-gd-native-ttf' '--enable-gd-imgstrttf' '--with-freetype-dir=/usr/local/freetype' '--with-iconv=/usr/local/iconv' '--enable-force-cgi-redirect' '--enable-pic' '--disable-rpath' '--enable-inline-optimization' '--with-dom' '--with-ncurses' '--enable-bcmath' '--enable-exif' '--enable-ftp' '--enable-magic-quotes' '--enable-safe-mode' '--enable-sysvsem' '--enable-sysvshm' '--enable-discard-path' '--enable-trans-sid' '--enable-yp' '--enable-wddx' '--without-oci8' '--enable-memory-limit' '--enable-bcmath' '--enable-shmop' '--enable-versioning' '--enable-calendar' '--enable-dbx' '--enable-dio' '--enable-mcal' '--with-soap=shhared' '--enable-soap' '--with-xmlrpc'

* Any other information unique or specific to your setup.
nothing special.

 * Any changes made in your php.ini compared to php.ini-dist (not your whole php.ini!)
nothing

* A gdb backtrace.
none


Reproduce code:
---------------
session_name("siteBsessionhash");

session_start();

$ServObj = new SoapServer("http://somesite.com/somewsdl",array('encoding'=>'GB2312'));
$ServObj->setClass("SomeServiceClass");
$ServObj->setPersistence(SOAP_PERSISTENCE_SESSION);
$ServObj->handle();



Expected result:
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script workout to put some message when called by another script on the same machine using soap method.

Actual result:
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blocked at the line where session_start() locates.