Writing a PHP extension

[Ever Olano]

Hi. I have the following questions regarding writing a PHP extension.
You don't have to answer all questions. Please answer everything you
can. I'd really appreciate it.

1. What is the most common version that's used out there? If I wrote
an extension for PHP 4, would it work for PHP 5? Also, is PHP 3 very
different?

2. My extension will need to use an external C++ (not C) library.
That should be all right, right?

3. When/where/how do I specify whether or not I want my extension to
be built-in or external? I know (actually, more like, think) that it
is in config.m4 but I don't know exactly how to specify it?

4. This is probably more a C/C++ question, when/where/how do I specify
whether or not my library is to be shared/dynamic or static? Also, is
that decision relevant only for external extensions?

Thanks! That's all for now (I'm sure more will come). I'd really
appreciate any help.
Ever

[Asgeir Frimannsson]

Ever Olano wrote:

1. What is the most common version that's used out there? If I wrote
an extension for PHP 4, would it work for PHP 5? Also, is PHP 3 very
different? I think it's very safe to ignore php3. It's very very rarely used out there.
You can build extensions that work for both php4 and php5. For php5, you can
add object oriented syntax to your library, which might be useful if you're
making use of eg some c++ library.
2. My extension will need to use an external C++ (not C) library.
That should be all right, right?

Yes, that's no problem. I have an url to a simple tutorial how to get
started on this:
http://bugs.tutorbuddy.com/php5cpp/php5cpp/

you might want to check out the php.pecl.dev or php.internal mailing
lists/newsgroups.

regards,
asgeir

[Ever Olano]

Hi, Asgeir. I actually chanced upon your tutorial after I posted my
message. Very good. Thanks for that and for this reply! I really
appreciate it.

Ever

"Asgeir Frimannsson" <a.***********@student.qut.edu.au> wrote in message
news:40***********************@freenews.iinet.net. au...

Ever Olano wrote:

1. What is the most common version that's used out there? If I wrote
an extension for PHP 4, would it work for PHP 5? Also, is PHP 3 very
different? I think it's very safe to ignore php3. It's very very rarely used out

there. You can build extensions that work for both php4 and php5. For php5, you can add object oriented syntax to your library, which might be useful if you're making use of eg some c++ library.

2. My extension will need to use an external C++ (not C) library.
That should be all right, right?

Yes, that's no problem. I have an url to a simple tutorial how to get
started on this:
http://bugs.tutorbuddy.com/php5cpp/php5cpp/

you might want to check out the php.pecl.dev or php.internal mailing
lists/newsgroups.

regards,
asgeir

[Ever Olano]

Hi, it's me again. In your tutorial, to make the extension dynamic, you
recommend using phpize, which is part of PEAR (right?). Some of our
customers may not necessarily have PEAR (right?), in which case, what is the
alternative?

Also, do third-party extensions usually supply the source code and let the
customer build it? If so, then that probably means that the customer
decides whether or not to make my extension static or dynamic. Right?

Thanks again,
Ever

"Asgeir Frimannsson" <a.***********@student.qut.edu.au> wrote in message
news:40***********************@freenews.iinet.net. au...

Ever Olano wrote:

1. What is the most common version that's used out there? If I wrote
an extension for PHP 4, would it work for PHP 5? Also, is PHP 3 very
different? I think it's very safe to ignore php3. It's very very rarely used out

there. You can build extensions that work for both php4 and php5. For php5, you can add object oriented syntax to your library, which might be useful if you're making use of eg some c++ library.

2. My extension will need to use an external C++ (not C) library.
That should be all right, right?

Yes, that's no problem. I have an url to a simple tutorial how to get
started on this:
http://bugs.tutorbuddy.com/php5cpp/php5cpp/

you might want to check out the php.pecl.dev or php.internal mailing
lists/newsgroups.

regards,
asgeir

[Asgeir Frimannsson]

Ever Olano wrote:

Hi, Asgeir. I actually chanced upon your tutorial after I posted my
message. Very good. Thanks for that and for this reply! I really
appreciate it.

Ever

Hi, it's not my tutorial sorry. And I haven't made an extension myself
yet :) Just fiddled with it a bit a while ago. But yes, it's a great
starter-tutorial, and i thought it would be useful for you.

regards,
asgeir