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Homephp教程php手册php 5.6版本中编写一个PHP扩展的简单示例,5.6示例

php 5.6版本中编写一个PHP扩展的简单示例,5.6示例

有时候在php本身没有满足需求的api时候,需要自己写相应的扩展,扩展写完之后进行编译,即可加入自己的开发环境中,扩展php的功能。

这里实现一个连接字符串和int型数的连接操作的简单扩展。

首先,下载最新的php源码安装包,进入ext/目录,新建extstrcat.def:

复制代码 代码如下:


string extstrcat(string strarg, int intarg)


随后运行:

复制代码 代码如下:


./ext_skel --extname=extstrcat --proto=extstrcat.def


修改ext/extstrcat/config.m4,去掉如下行前面的注释(dnl):

复制代码 代码如下:


PHP_ARG_ENABLE(extstrcat, whether to enable extstrcat support, 
Make sure that the comment is aligned: 
[  --enable-extstrcat           Enable extstrcat support])

此时来编辑ext/extstrcat/extstrcat.c,找到PHP_FUNCTION(extstrcat)函数,这里表示扩展中的方法名为extstrcat,方法实现如下:

复制代码 代码如下:


PHP_FUNCTION(extstrcat)
{
     char *strarg = NULL;
     int argc = ZEND_NUM_ARGS();
     int strarg_len;
     long intarg;
 
     char intargstr[10];
     int retstrlen = 0;
     char *retstr = NULL;
 
     if (zend_parse_parameters(argc TSRMLS_CC, "sl", &strarg, &strarg_len, &intarg) == FAILURE)
         return;
 
     snprintf(intargstr, 9, "%d", intarg);
     retstrlen = strarg_len + strlen(intargstr) + 1;
     retstr = (char *)malloc(sizeof(char)* retstrlen);
     memset(retstr, '\0', retstrlen);
     strncat(retstr, strarg, strlen(strarg));
     strncat(retstr, intargstr, strlen(intargstr));
     RETURN_STRING(retstr, 1);
 
     php_error(E_WARNING, "extstract: not yet implemented");
}

,其中strarg和intarg即为对应的两个字符串和整型参数。
接下来要做的事情就是编译扩展,

复制代码 代码如下:


phpize
./configure --enable-extstrcat
make


编译成功之后,在ext/modules目录下会生成extstrcat.so文件,

复制代码 代码如下:


cp ./modules/extstrcat.so /usr/local/lib/php/extensions/no-debug-non-zts-20121212/

修改php.ini,增加extension = extstrcat.so。
重启php-fpm,运行phpinfo()可以看到新增了extstrcat扩展。
现在来写一个Demo,测试一下刚刚的php扩展,

复制代码 代码如下:


if(!extension_loaded('extstrcat')) {
 dl('extstrcat.' . PHP_SHLIB_SUFFIX);
}
$ret=extstrcat('testarg',1234);
echo $ret;
?>


,命令行下运行该文件,得到testarg1234.
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