How to call function from .so file using php scrip

I have created .so file for following function:

main.cpp:

#include<stdio.h>
#include "test.h"
int main()
{
int a=hello();
printf("%d",a);
return 0;
}

test.h

int test()
{
 int a=5,b=10,c;
 printf("Hi");
 c=a+b;
 return c;
}

Now I create shared library file main.so for above program and want to call hell() function from php script.

p1.php

<?php
// Call to test function in main.cpp
>

I saw various tutorials on web but no clear explaination. Can someone give link to some tutorial or help me for this prob?

Sara Goleman's book is an excellent, thorough coverage of how to develop php extensions (including your topic).

Here is an introductory article.

http://devzone.zend.com/303/extension-writing-part-i-introduction-to-php-and-zend/

I've read her book and it covers this question entirely.

http://www.amazon.com/dp/067232704X

I'm sorry if this isn't a quick and easy answer. However, the PHP API isn't exactly straight forward. It didn't quite make sense without further background information on each of the components. Once I had that, I was able to see PHP API development clearly.

Alternatively, if you're looking for a different approach, using RabbitMQ or some other message queue service may be desirable to invoke a c++ application and send messages back and forth from (optionally) a persistent c++ process.

Here are some further links that I've found to be useful:

http://devzone.zend.com/1435/wrapping-c-classes-in-a-php-extension/

http://talks.somabo.de/200903_montreal_php_extension_writing.pdf

http://simonholywell.com/post/2010/09/15-excellent-resources-for-php-extension-development.html

http://blog.golemon.com/2006/06/what-heck-is-tsrmlscc-anyway.html

http://www.php.net/manual/en/internals2.php