c开发扩展php
⑴ 如何用c语言在windows平台上开发php extension
如何使用C语言开发PHP扩展。
函数功能:php里面的整数是有符号数,其内部实现其实就是long,不是unsigned long。对于32位机器来说,php最大能表示的整数就是2^31-1了,一般在应用中碰到大于2^31-1而小于2^32的数就只能用字符串来表示了。对于mixed int_ext(string in)来说,如果字符串in表示的整数小于2^31-1,那么就返回整数,如果大于就返回字符串。
开发扩展步骤如下:(首先需要下载php的源码,这里下载的是php-5.3.14)
1,建立扩展骨架
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01.cd php-5.3.14/ext
02../ext_skel --extname=int_ext
cd php-5.3.14/ext
./ext_skel --extname=int_ext
2,修改编译参数
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01.cd php-5.3.14/ext/int_ext
02.vi config.m4
cd php-5.3.14/ext/int_ext
vi config.m4去掉 PHP_ARG_ENABLE(int_ext, whether to enable int_ext support 和
[ --enable-int_ext Enable int_ext support]) 两行前面的dnl 修改后为:
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01.1. dnl Otherwise use enable:
02.2. PHP_ARG_ENABLE(int_ext, whether to enable int_ext support,
03.3. dnl Make sure that the comment is aligned:
04.4. [ --enable-int_ext Enable int_ext support])
1. dnl Otherwise use enable:
2. PHP_ARG_ENABLE(int_ext, whether to enable int_ext support,
3. dnl Make sure that the comment is aligned:
4. [ --enable-int_ext Enable int_ext support])
3,编写C代码
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01.cd php-5.3.14/ext/int_ext
02.vi php_int_ext.h
03.#在 PHP_FUNCTION(confirm_int_ext_compiled); 后面新增一行 PHP_FUNCTION(int_ext);
cd php-5.3.14/ext/int_ext
vi php_int_ext.h
#在 PHP_FUNCTION(confirm_int_ext_compiled); 后面新增一行 PHP_FUNCTION(int_ext);[plain] view plainprint?
01.cd php-5.3.14/ext/int_ext
02.vi int_ext.c
03.#在PHP_FE(confirm_int_ext_compiled, NULL) 后面添加 PHP_FE(int_ext, NULL)添加后为:
04.1. zend_function_entry int_ext_functions[] = {
05.2. PHP_FE(confirm_int_ext_compiled, NULL) /* For testing, remove later. */
06.3. PHP_FE(int_ext, NULL) /* For testing, remove later. */
07.4. {NULL, NULL, NULL} /* Must be the last line in int_ext_functions[] */
08.5. };
cd php-5.3.14/ext/int_ext
vi int_ext.c
#在PHP_FE(confirm_int_ext_compiled, NULL) 后面添加 PHP_FE(int_ext, NULL)添加后为:
1. zend_function_entry int_ext_functions[] = {
2. PHP_FE(confirm_int_ext_compiled, NULL) /* For testing, remove later. */
3. PHP_FE(int_ext, NULL) /* For testing, remove later. */
4. {NULL, NULL, NULL} /* Must be the last line in int_ext_functions[] */
5. };
核心代码:
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01.PHP_FUNCTION(int_ext)
02.{
03. char * str = NULL;
04. int str_len;
05. int argc = ZEND_NUM_ARGS();
06. if(zend_parse_parameters(argc TSRMLS_CC,"s",&str,&str_len) == FAILURE)
07. return ;
08. char * result;
09. int result_length = str_len;
10. result = (char *) emalloc(result_length + 1);
11. memcpy(result,str,result_length);
12. unsigned long result_num = strtoul(result, NULL, 10);
13. int sizeoflong sizeof(long);
14. unsigned long max_long = 1 << (sizeoflong * 8 -1);
15. if(result_num < max_long)
16. {
17. RETURN_LONG(result_num);
18. }
19. else
20. {
21. RESULT_STRINGL(result, result_length, 0);
22. }
23.}
PHP_FUNCTION(int_ext)
{
char * str = NULL;
int str_len;
int argc = ZEND_NUM_ARGS();
if(zend_parse_parameters(argc TSRMLS_CC,"s",&str,&str_len) == FAILURE)
return ;
char * result;
int result_length = str_len;
result = (char *) emalloc(result_length + 1);
memcpy(result,str,result_length);
unsigned long result_num = strtoul(result, NULL, 10);
int sizeoflong sizeof(long);
unsigned long max_long = 1 << (sizeoflong * 8 -1);
if(result_num < max_long)
{
RETURN_LONG(result_num);
}
else
{
RESULT_STRINGL(result, result_length, 0);
}
}
4,编译
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01.cd php-5.3.14/ext/int_ext
02./usr/local/php/bin/pphpize
03../configure --with-php-config=/usr/local/php/bin/php-config
04.make
05.make install
cd php-5.3.14/ext/int_ext
/usr/local/php/bin/pphpize
./configure --with-php-config=/usr/local/php/bin/php-config
make
make install
此时会产生一个so文件: /usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/int_ext.so
修改php.ini 添加扩展extension_dir = "/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/"
[int_ext]
extension = int_ext.so
5,测试
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01.$a = int_ext("12345678900");
02.var_mp($a);
03.$a = int_ext("123456789");
04.var_mp($a);
$a = int_ext("12345678900");
var_mp($a);
$a = int_ext("123456789");
var_mp($a);
结果输出:
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01.string(11) "12345678900"
02.int(123456789)
⑵ 如何用C语言编写PHP扩展的详解
1:预定义
在home目录,也可以其他任意目录,写一个文件,例如caleng_mole.def
内容是你希望定义的函数名以及参数:
int a(int x,int y)
string b(string str,int n)
2:到php源码目录的ext目录
#cd /usr/local/php-5.4.0/ext/
执行命令,生成对应扩展目录
#./ext_skel --extname=caleng_mole --proto=/home/hm/caleng_mole.def
3:修改config.m4
去掉dnl的注释
PHP_ARG_ENABLE(caleng_mole, whether to enable caleng_mole support,
Make sure that the comment is aligned:
[ --enable-caleng_mole Enable caleng_mole support])
4:修改caleng_mole.c
代码如下:
/* {{{ proto int a(int x, int y)
*/
PHP_FUNCTION(a)
{
int argc = ZEND_NUM_ARGS();
int x;
int y;
int z;
if (zend_parse_parameters(argc TSRMLS_CC, "ll", &x, &y) == FAILURE)
return;
z=x+y;
RETURN_LONG(z);
}
/* }}} */
/* {{{ proto string b(string str, int n)
*/
PHP_FUNCTION(b)
{
char *str = NULL;
int argc = ZEND_NUM_ARGS();
int str_len;
long n;
char *result;
char *ptr;
int result_length;
if (zend_parse_parameters(argc TSRMLS_CC, "sl", &str, &str_len, &n) == FAILURE)
return;
result_length = str_len * n;
result = (char *) emalloc(result_length + 1);
ptr = result;
while (n--) {
memcpy(ptr, str, str_len);
ptr += str_len;
}
*ptr = '