如何在Zend PHP扩展中连接外部C / C ++库

时间:2013-11-15 14:05:54

标签: php c php-internals

我正在尝试使用Zend框架创建一个用C语言编写的.so PHP扩展。使用独立扩展,一切都很好。但是,如果我尝试在我的扩展中使用其他一些动态链接库,我会收到以下错误:

PHP Warning:  dl(): Unable to load dynamic library '/usr/lib/php5/20121212/test.so' - /usr/lib/php5/20121212/test.so: undefined symbol: _Z5hellov in /var/www/test.php on line 2
PHP Fatal error:  Call to undefined function my_function() in /var/www/test.php on line 3

我编译过libhello.so并复制到同一目录/ usr / lib / php5 / 20121212 / 我如何在test.so模块中使用它?

以下是源代码:

test.c的:

#include "php.h"
#include "hello.h"

ZEND_FUNCTION( my_function );
ZEND_FUNCTION(Hello);

zend_function_entry firstmod_functions[] =
{
ZEND_FE(my_function, NULL)
    ZEND_FE(Hello, NULL)
    {NULL, NULL, NULL}
};

zend_module_entry firstmod_module_entry =
{
    STANDARD_MODULE_HEADER,
    "First Module",
    firstmod_functions,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NO_VERSION_YET,
STANDARD_MODULE_PROPERTIES
};

ZEND_GET_MODULE(firstmod)

ZEND_FUNCTION( my_function )
{
    char *str; int str_len;
    long l;
    if(ZEND_NUM_ARGS() != 2) WRONG_PARAM_COUNT; 

    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "sl", 
        &str, &str_len, &l) == FAILURE) {
        return;
    }

    zend_printf("%s  \r\n", str);
    zend_printf("%ld \r\n", l);

    RETURN_LONG(1);

}

ZEND_FUNCTION (Hello) {
    hello();
}

hello.h:

#include <stdio.h>

void hello();

的hello.c:

#include "hello.h"

void hello () {
printf("%s\n", "Hello, world!");
}

test.php的:

<?php
dl("test.so");
my_function("123",12);
    Hello();
?> 

1 个答案:

答案 0 :(得分:2)

为了使某个函数对php用户可见,您需要使用宏PHP_FUNCTION()

hello.h:

PHP_FUNCTION(hello_world);

test.c的:

ZEND_BEGIN_ARG_INFO_EX(arginfo_hello_world, 0, 0, 2)
    ZEND_ARG_INFO(0, arg1_name)
    ZEND_ARG_INFO(0, arg2_name)
ZEND_END_ARG_INFO()


...


const zend_function_entry pcap_functions[] = { 
    ...
    PHP_FE(my_function, arginfo_hello_world)
    ...
};


...
PHP_FUNCTION( my_function )
{
    char *str; int str_len;
    long l;
    if(ZEND_NUM_ARGS() != 2) WRONG_PARAM_COUNT; 

    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "sl", 
        &str, &str_len, &l) == FAILURE) {
        return;
    }

    zend_printf("%s  \r\n", str);
    zend_printf("%ld \r\n", l);

    RETURN_LONG(1);

}

...