Creating shared object of C files for php usage [SWIG Usage]

STEP1 Create a C file
eg sofile.c
===========================================
#include

void fun_in_so()
{
printf("This is function called from so");
}
int add_param(int x,int y)
{
return(x+y);
}
===========================================

STEP2 Create a file and list all C functions there and include C file as well
example.i
================================================
%module example
%include cpointer.i
%include typemaps.i
%include phppointers.i
%pointer_functions(int,intp)


#define PI 3.14159
#define VIKAS 123456
#define ANKIT "asdgasdgfasf"

%{
#include "sofile.c"
%}

extern void fun_in_so(void);
extern int add_param(int x,int y);

================================================

STEP3 Commands
swig -php example.i
[Above command will create three files example_wrap.c php_example.h, example.php ]
gcc `php-config --includes` -fpic -c example_wrap.c
[Above command will create example_wrap.o file]
gcc -shared example_wrap.o -o example.so
[Above command will create example.so file]
cp example.so /usr/lib/php/modules/


STEP4 Create a php file and call c functions
php sofile.php
================================================
dl("example.so");
echo PI;
echo "\n";
echo VIKAS;
echo "\n";
echo ANKIT;
echo "\n";
fun_in_so();
echo "\n";
$aa = add_param(2, 4);
echo "\nRes = $aa";
?>

OUTPUT
[root@vikas so]# php sofile.php
3.14159
123456
asdgasdgfasf

This is function called from so
Res = 6
[root@vikas so]#

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