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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)

1,建立扩展骨架

cd php-5.3.14/ext  ./ext_skel --extname=int_ext

2,修改编译参数

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:

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

3,编写C代码

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);

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:

zend_function_entry int_ext_functions[] = {    PHP_FE(confirm_int_ext_compiled, NULL) /* For testing, remove later. */    PHP_FE(int_ext, NULL)              /* For testing, remove later. */    {NULL, NULL, NULL}             /* Must be the last line in int_ext_functions[] */     };

核心代码:

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

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

$a = int_ext("12345678900");  var_dump($a);  $a = int_ext("123456789");  var_dump($a);   结果输出:string(11) "12345678900"  int(123456789)

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