Using PHP to invoke code in the so library file

Original author Charlee, original link http://tech.idv2.com/2007/07/06/use-local-so-in-php/

If a feature is compiled into the so file, then how to invoke it through PHP. One way is to write a PHP module (PHP extension), call the function in PHP , and then use the module to call the function in so. Here's a simple example of using the OS Fedora Core 6.

First, make a simple so file:

1/**
2 * hello.c
3 * To compile, use following commands:
4 * gcc-o-c-fpic-o hello.o hello.c
5 * Gcc-shared-o libhello.so hello.o
6 */
7
8 int Hello_add (int a, int b)
9 {
return a + B;
11}

It is then compiled into a. So file and placed in the system:

1 ___fckpd___1nbsp;gcc-o-c-fpic-o hello.o hello.c
2 ___fckpd___1nbsp;gcc-shared-o libhello.so hello.o
3 ___fckpd___1nbsp;su
4 # Echo/usr/local/lib >/etc/ld.so.conf.d/local.conf
5 # CP Libhello.so/usr/local/lib
6 #/sbin/ldconfig

Write a small program to verify its correctness:

1/**//**
2 * hellotest.c
3 * To compile, use following commands:
4 * Gcc-o Hellotest-lhello hellotest.c
5 */
6 #include <stdio.h>
7 int Main ()
8 {
9 int a = 3, b = 4;
printf ("%d +%d =%d/n", A, B, Hello_add (a,b));
return 0;
12} Compile and execute:

$ gcc-o Hellotest-lhello hellotest.c
$/hellotest
3 + 4 = 7

OK, let's Make a PHP module below. First make sure you install the Php-devel package, if not, please find it by yourself from the installation CD. Then download the PHP source code. I'm using php-5.2.3.tar.gz, decompression.

$ tar xzvf php-5.2.3.tar.gz
$ cd Php-5.2.3/ext

The following command is then used to create a module called Hello.

$./ext_skel--extname=hello

After executing this command, it prompts you what command to use to compile the module, but it is a compilation method that integrates the module into the PHP interior. The method is simpler if you want to compile into a php_hello.so that can be dynamically loaded.

$ cd Hello

First edit the Config.m4 file and remove the comments from lines 16th and 18th (the annotation symbol is DNL.) ）

1 16:php_arg_enable (Hello, whether to ENABLE hello support,
2 17:dnl Make sure this comment is aligned:
3: [--enable-hello enable hello support])

Then execute the PHPIZE program to generate the Configure script:

$ phpize

Then open php_hello.h, in php_function (confirm_hello_compiled); Add function declaration below:

1php_function (confirm_hello_compiled); /**//* for testing, remove later. */
2 php_function (Hello_add); Open hello.c and add the following below Php_fe (confirm_hello_compiled, NULL).

1 Zend_function_entry hello_functions[] = {
2 Php_fe (confirm_hello_compiled, NULL)/**//* for testing, remove later. */
3 Php_fe (Hello_add, NULL)/**//* for testing, remove later. */
4 {null, NULL, NULL}/**//* must is the last line in hello_functions[] * *
5};

Then write the contents of the Hello_add function at the very end of the hello.c: