Allow creating $_SERVER from $_ENV, but not $_ENV from $_SERVER.

Author: dstogov

sapi/cgi/cgi_main.c

@@ -624,20 +624,15 @@ static void cgi_php_load_env_var(char *var, unsigned int var_len, char *val, uns
 
 static void cgi_php_import_environment_variables(zval *array_ptr)
 {
+	if (Z_TYPE(PG(http_globals)[TRACK_VARS_ENV]) != IS_ARRAY) {
+		zend_is_auto_global_str("_ENV", sizeof("_ENV")-1);
+	}
+
 	if (Z_TYPE(PG(http_globals)[TRACK_VARS_ENV]) == IS_ARRAY &&
-		Z_ARR_P(array_ptr) != Z_ARR(PG(http_globals)[TRACK_VARS_ENV]) &&
-		zend_hash_num_elements(Z_ARRVAL(PG(http_globals)[TRACK_VARS_ENV])) > 0
-	) {
+		Z_ARR_P(array_ptr) != Z_ARR(PG(http_globals)[TRACK_VARS_ENV])) {
 		zval_dtor(array_ptr);
 		ZVAL_DUP(array_ptr, &PG(http_globals)[TRACK_VARS_ENV]);
 		return;
-	} else if (Z_TYPE(PG(http_globals)[TRACK_VARS_SERVER]) == IS_ARRAY &&
-		Z_ARR_P(array_ptr) != Z_ARR(PG(http_globals)[TRACK_VARS_SERVER]) &&
-		zend_hash_num_elements(Z_ARRVAL(PG(http_globals)[TRACK_VARS_SERVER])) > 0
-	) {
-		zval_dtor(array_ptr);
-		ZVAL_DUP(array_ptr, &PG(http_globals)[TRACK_VARS_SERVER]);
-		return;
 	}
 
 	/* call php's original import as a catch-all */
@@ -1983,6 +1978,11 @@ consult the installation file that came with this distribution, or visit \n\
 		}
 		fastcgi = fcgi_is_fastcgi();
 	}
+
+	/* make php call us to get _ENV vars */
+	php_php_import_environment_variables = php_import_environment_variables;
+	php_import_environment_variables = cgi_php_import_environment_variables;
+
 	if (fastcgi) {
 		/* How many times to run PHP scripts before dying */
 		if (getenv("PHP_FCGI_MAX_REQUESTS")) {
@@ -1993,10 +1993,6 @@ consult the installation file that came with this distribution, or visit \n\
 			}
 		}
 
-		/* make php call us to get _ENV vars */
-		php_php_import_environment_variables = php_import_environment_variables;
-		php_import_environment_variables = cgi_php_import_environment_variables;
-
 		/* library is already initialized, now init our request */
 		request = fcgi_init_request(fcgi_fd, NULL, NULL, NULL);