PHP as ISAPI module under IIS: Extension problem

[Don: Bucknell Web Application Developer]

I've been scouring the Google Usenet archives, and I can find neither
any article that addresses this question, nor any group that seems
dead-on appropriate for asking it; I posted this in alt.php, but I've
had no luck there.

I have installed PHP 4.3.2 as an ISAPI module under IIS 5.1 on Windows
XP Professional SP1. I have previously done this under IIS 5.0 on Windows
2000 Professional several times, with no problems at all.

This time, though, there is some problem with some (though not all) of
the extensions I wish to use. I have added (uncommented, actually) the
following lines in php.ini:
extension = php_ldap.dll
extension = php_sockets.dll

Now, whenever I start the Web publishing service, a system dialog
appears with the following message:
Unknown(): Unable to load dynamic library
'c:\windows\sys tem32\inetsrv\p hp_ldap.dll' - the specified module
could not be found.

Sure enough, I can call sockets methods, but not LDAP methods (I get
'undefined function' errors, as expected). php_ldap.dll and
php_sockets.dll are in the very same directory together, and have
identical security settings. I've tried copying them to various other
directories (and updating the extension_dir value in the php.ini
file), but that has no effect. The very same thing happens, with the
new path in the error dialog.

Why would one load but not the other? Any suggestions would be
appreciated.
--
Don Rea
Bucknell University ISR

[Dave Bell]

Although you probably will not like it, I suggest you install Apache 2.x
onto your Windows XP machine, not only is Apache 2.x much more stable on
Windows now, its faster, and the PHP interface is faster as well. I
highly recommend moving to a better web-server like Apache.

[Tracy Nelson]

Don: Bucknell Web Application Developer wrote:

Now, whenever I start the Web publishing service, a system dialog
appears with the following message:
Unknown(): Unable to load dynamic library
'c:\windows\sys tem32\inetsrv\p hp_ldap.dll' - the specified module
could not be found.

Have you tried using regsvr32 to register the dll (if that's still necessary
under XP)?

[Don: Bucknell Web Application Developer]

> Although you probably will not like it, I suggest you install Apache 2.x

onto your Windows XP machine, not only is Apache 2.x much more stable on
Windows now, its faster, and the PHP interface is faster as well. I
highly recommend moving to a better web-server like Apache.

Alas, the choice of web server is not up to me. I'm using this machine
for development and testing for an IIS deployment environment at my
day job. Believe me, if I could select the tools, I'd never wrestle
with IIS or write another line of VBS again!

[Don: Bucknell Web Application Developer]

> Have you tried using regsvr32 to register the dll (if that's still necessary

under XP)?

The equivalent of running regsvr32 is what's happening when IIS is
loading the PHP libraries at start up (or at the restart of the
service). So, if I try registering the library by hand, I get that
same error message from the system.

The real mystery, to me, is why one of the libraries loads and the
other doesn't.