安装phpcpp

我们不赘述为什么试用phpcpp 进行php拓展库的开发，我们直接进入实践

下载并安装PHP-CPP 库

• 获取PHP-CPP 库代码

$ git clone https://github.com/CopernicaMarketingSoftware/PHP-CPP.git

• 安装

1. 切换到PHP-CPP 源代码目录，其中应该包含Makefile 文件，它是一个包含编译器设置和指令的文件，在该目录下运行make启动编译器并构建库

$ make

2. make install 安装到系统

$ sudo make install

第一个拓展

• 在官网下载一个空的扩展包demo空demo下载，在demo文件中包含一个 Makefile编译器说明文件，一个特定于扩展的 php.ini 文件，当然还有 *.cpp 文件

1. Makefile 文件基本不需要修改，我们最主要关注 NAME(拓展名称)，INI_DIR（ini 目录）;

#
#	Name of your extension
#
#	This is the name of your extension. Based on this extension name, the
#	name of the library file (name.so) and the name of the config file (name.ini)
#	are automatically generated
#

NAME				=	tiway


#
#	Php.ini directories
#
#	In the past, PHP used a single php.ini configuration file. Today, most
#	PHP installations use a conf.d directory that holds a set of config files,
#	one for each extension. Use this variable to specify this directory.
#

INI_DIR				=	/etc/php/7.3/cli/conf.d/

2. 拓展名.ini 初始拓展名，这个文件主要是在Make 编译的时候要用到里面很简单就是拓展的名称

 extension=tiway.so

3. main.cpp cpp扩展的实现,我们按照官网尝试写一个输出函数

#include <phpcpp.h>
#include <iostream>

void example()
{
    // the C++ equivalent of the echo() function
    Php::out << "example output" << std::endl;

    // generate output without a newline, and ensure that it is flushed
    Php::out << "example output" << std::flush;

    // or call the flush() method
    Php::out << "example output";
    Php::out.flush();

    // just like all PHP functions, you can call the echo() function 
    // from C++ code as well
    Php::echo("Example output\n");

    Php::Value 
    
}  

/**
 *  tell the compiler that the get_module is a pure C function
 */
extern "C" {
    
    /**
     *  Function that is called by PHP right after the PHP process
     *  has started, and that returns an address of an internal PHP
     *  strucure with all the details and features of your extension
     *
     *  @return void*   a pointer to an address that is understood by PHP
     */
    PHPCPP_EXPORT void *get_module() 
    {
        // static(!) Php::Extension object that should stay in memory
        // for the entire duration of the process (that's why it's static)
        static Php::Extension extension("tiway", "1.0");
        
        // @todo    add your own functions, classes, namespaces to the extension
        extension.add<example>("example");
        
        // return the extension
        return extension;
    }
}

4. 在文件目录下执行 make && make install

$ make && make install

如果已经编译过则

$ make clean && make && make install

5. 查看拓展是否安装成功

php -m | grep tiway

在拓展目录新建php文件，test.php

<?php
example();

//example output
//example outputexample output
?>

总结

1. 写cpp拓展，至少对cpp 有一定的了解，比如了解cpp 包的引入及常用的包如所用的
2. PHP-CPP 拓展库目前仅支持linux环境