PHP расширение пример кода

ПРИМЕР расширения здесь: http://fkn.ktu10.com/?q=node/4937

#include "stdafx.h"

ZEND_FUNCTION(DoubleUp);    
/* compiled function list so Zend knows what's in this module */    
zend_function_entry CustomExtModule_functions[] = {    
   ZEND_FE(DoubleUp, NULL)    
    {NULL, NULL, NULL}    
};    

/* compiled module information */    
zend_module_entry CustomExtModule_module_entry = {    
    STANDARD_MODULE_HEADER,    
    "CustomExt Module",    
    CustomExtModule_functions,    
    NULL, NULL, NULL, NULL, NULL,    
    NO_VERSION_YET, STANDARD_MODULE_PROPERTIES    
};    

/* implement standard "stub" routine to introduce ourselves to Zend */    
ZEND_GET_MODULE(CustomExtModule)    
/* DoubleUp function */    
/* This method takes 1 parameter, a long value, returns    
   the value multiplied by 2 */    
ZEND_FUNCTION(DoubleUp){    
    long theValue = 0;    
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC,    
                              "l", &theValue) == FAILURE){    
        RETURN_STRING("Bad parameters!", true);    
    }    
    theValue *= 2;    
    RETURN_LONG(theValue);    
}