PHP7 uses lib library case code analysis based on function method

This time I will bring you a case code analysis of PHP7 using the lib library based on the function method. What are the precautions for PHP7 using the lib library based on the function method. The following is a practical case, let's take a look.

Preface

First let’s talk about what a lib library is. A lib library is a file that provides specific functions. It can be regarded as a file in PHP, which provides some function methods. It’s just that this lib library is written in c or c.

Scenarios using lib library. Some software already provides lib libraries, so we don't need to implement it again. For example, the original mysql extension is encapsulated using the mysql official lib library.

In this article, we will build a simple lib library and make encapsulated calls in the extension.

Code

Basic code

For this extension, we will add # to the say extension ##call_lib_fun(). Please read this blog post for the code related to say extension. PHP7 extension development hello word This article has introduced in detail how to create an extension and provided source code download.

Code implementation

Build lib library

#ifndef TEST_HEADER_FILE
#define TEST_HEADER_FILE
#include <stdlib.h>
#include <string.h>
char * show_site(); 
#endif

#include "hello.h"
char * show_site()
{
  char *site = malloc(15 * sizeof(char));
  strcpy(site, "www.bo56.com");
  return site;
}

$ gcc -g -O0 -fPIC -shared -o hello.so ./hello.c

hello.so to the /usr/local/lib/ directory and name it hello.so hello.hCopy to the /usr/local/include/ directory.

Modify the config.m4 file

PHP_ADD_LIBRARY_WITH_PATH(hello, /usr/local/lib/, SAY_SHARED_LIBADD)
PHP_SUBST(SAY_SHARED_LIBADD)

Write extension code

reference of hello.h.

#include "php_say.h"
#include <stdio.h>
//下面这行是增加的
#include "hello.h"

show_site() method. The code is as follows:

PHP_FUNCTION(show_site)
{
  char *site = show_site();
  RETVAL_STRING(site);
  free(site);
  return;
}

php call result

<?php
$result = show_site();
var_dump($result);
?>

$php ./test.php
string(12) "www.bo56.com"

code interpretation

#include "hello.h".

Detailed explanation of the steps for PHP to obtain the binary tree image

The steps for PHP to obtain the nodes of the linked list from back to front Detailed explanation

The above is the detailed content of PHP7 uses lib library case code analysis based on function method. For more information, please follow other related articles on the PHP Chinese website!