why these code cause compile error?

I 'am a new guy of php internal, I tried to define a class in extension just for a attempt. PHP_MINIT_FUNCTION(zhangjianyu) { /* If you have INI entries, uncomment these lines REGISTER_INI_ENTRIES(); */ zend_class_entry ce; INIT_CLASS_ENTRY(ce, WPS_CLASS_NAME, php_wps_method_functions); php_wps_sc_entry = zend_register_internal_class(&ce TSRMLS_CC); zend_declare_class_constant_double(php_wps_sc_entry, "VERSION", sizeof("VERSION"), 1.32 TSRMLS_DC); zend_declare_class_constant_string(php_wps_sc_entry, "NAME", sizeof("NAME"), "say say" TSRMLS_DC); return SUCCESS; } The Code above will cause compile errors like this: error C2059: syntax error : 'type', just indicate the line zend_declare_class_constant_double(php_wps_sc_entry, "VERSION", sizeof("VERSION"), 1.32 TSRMLS_DC); is not correct. Either I use zend_declare_class_constant_double or usezend_declare_property_null(php_wps_sc_entry, "name", strlen("name"), ZEND_ACC_PUBLIC TSRMLS_DC),both of them will cause the same error : error C2059: syntax error : 'type'