Use PHP to invoke code in the so library file and write so simple instances

Use PHP to invoke code in the so library file and write so simple instances

If a feature is compiled into the so file, then how to invoke it through PHP. One way to do this is to write a php extension module (PHP extension), call the function within the module in PHP, and then call the function in so through the module. The following is a simple example of an operating system that uses RHEL5.

First, make a simple so file:

/**
* HELLO.C
* To compile, use following commands:
* Gcc-o-c-fpic-o hello.o hello.c
* Gcc-shared-o libhello.so hello.o
*/

int Hello_add (int a, int b)
{
return a + B;
And then compile it into the. so file and put it into the system:

$ gcc-o-c-fpic-o hello.o hello.c
$ gcc-shared-o libhello.so hello.o
$ su
# Echo/usr/local/lib >/etc/ld.so.conf.d/local.conf
# CP Libhello.so/usr/local/lib
#/sbin/ldconfig Write a small program to verify its correctness:

/**
* HELLOTEST.C
* To compile, use following commands:
* Gcc-o Hellotest-lhello hellotest.c
*/
#i nclude <stdio.h>
int main ()
{
int a = 3, b = 4;
printf ("%d +%d =%d/n", A, B, Hello_add (a,b));
return 0;
Compile and execute:

$ gcc-o Hellotest-lhello hellotest.c
$./hellotest
3 + 4 = 7OK, 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 then create a module called Hello with the following command.

$./ext_skel--extname=hello After executing the command, it prompts you what commands should be used 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.) ）

16:php_arg_enable (Hello, whether to ENABLE hello support,
17:DNL Make sure this comment is aligned:
[--enable-hello enable hello support] then execute the PHPIZE program to generate the Configure script:

$ phpize then opens Php_hello.h, in Php_function (confirm_hello_compiled); Add function declaration below:

Php_function (confirm_hello_compiled); /* For testing, remove later. */
Php_function (Hello_add); open hello.c, add the following below Php_fe (confirm_hello_compiled, NULL).

Zend_function_entry hello_functions[] = {
Php_fe (confirm_hello_compiled, NULL)/* For testing, remove later. */
Php_fe (Hello_add, NULL)/* For testing, remove later. */
{null, NULL, NULL}/* must is the last line in hello_functions[] * *
And then write the contents of the Hello_add function at the very end of the hello.c:

Php_function (Hello_add)
{
Long int A, b;
long int result;

if (Zend_parse_parameters (Zend_num_args () tsrmls_cc, "ll", &a, &b) = = failure) {
Return
}

result = Hello_add (A, b);

Return_long (result);
Save exit, compile and install:

$./configure
$ make Ldflags=-lhello
$ su
# CP Modules/hello.so/usr/lib/php/modules Then create a hello.php file under/var/www/html, which reads as follows:

<?php
DL ("hello.so");
Echo Hello_add (3, 4);
?> then opens the hello.php file in the browser, and if 7 is displayed, the function call succeeds.

This article from Csdn Blog, reproduced please indicate the source: http://blog.csdn.net/zuiaituantuan/archive/2010/10/03/5919572.aspx