PHP扩展中访问全局变量$_POST,$_GET,$_SERVER等

写扩展，离不了访问全局变量像$_POST,$_GET,$_SERVER等，

以下是YAF提供的代码，我把YAF相关的宏，去掉了...

  1 /**  YAF文档 http://yaf.laruence.com/manual/  **/

 2 
 3 
 4 zval * yaf_request_query(uint type, char * name, uint len TSRMLS_DC) {
 5     zval        **carrier, **ret;
 6 
 7 #if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION < 4)
 8     zend_bool   jit_initialization = (PG(auto_globals_jit) && !PG(register_globals) && !PG(register_long_arrays));
 9 #else
10     zend_bool   jit_initialization = PG(auto_globals_jit);
11 #endif
12 
13     /* for phpunit test requirements */
14    switch (type) {
15         case TRACK_VARS_POST:
16         case TRACK_VARS_GET:
17         case TRACK_VARS_FILES:
18         case TRACK_VARS_COOKIE:
19             carrier = &PG(http_globals)[type];
20             break;
21         case TRACK_VARS_ENV:
22             if (jit_initialization) {
23                 zend_is_auto_global(ZEND_STRL("_ENV") TSRMLS_CC);
24             } 
25             carrier = &PG(http_globals)[type];
26             break;
27         case TRACK_VARS_SERVER:
28             if (jit_initialization) {
29                 zend_is_auto_global(ZEND_STRL("_SERVER") TSRMLS_CC);
30             } 
31             carrier = &PG(http_globals)[type];
32             break;
33         case TRACK_VARS_REQUEST:
34             if (jit_initialization) {
35                 zend_is_auto_global(ZEND_STRL("_REQUEST") TSRMLS_CC);
36             } 
37             (void)zend_hash_find(&EG(symbol_table), "_REQUEST", sizeof("_REQUEST")-1, (void **)&carrier);
38             break;
39         default:
40             break;
41     }
42 
43     if (!carrier || !(*carrier)) {
44         zval *empty;
45         MAKE_STD_ZVAL(empty);
46         ZVAL_NULL(empty);
47         return empty;
48     }
49 
50     if (!len) {
51         Z_ADDREF_P(*carrier);
52         return *carrier;
53     }
54 
55     if (zend_hash_find(Z_ARRVAL_PP(carrier), name, len + 1, (void **)&ret) == FAILURE) {
56         zval *empty;
57         MAKE_STD_ZVAL(empty);
58         ZVAL_NULL(empty);
59         return empty;
60     }
61     
62     Z_ADDREF_P(*ret);
63     return *ret;
64 }