Help with updating from PHP 5 to PHP 7

Hello, I am not sure if it is o.k. to ask for help on this mailing list. Unfortunately at stackoverflow.com nobody who is familiar with php-extensions seems to be around. I found this guide for upgrading PHP: https://wiki.php.net/phpng-upgrading. And I searched other packages to see how they did it. I managed that the package I try to update compiles without errors, but I get some warnings and one of those at least is still breaking the functionality of the package. Here is the diff of one function I changed that now breaks. Can somebody tell me where I am wrong? PHP_FUNCTION(scard_connect) {   DWORD dwPreferredProtocol = SCARD_PROTOCOL_T1|SCARD_PROTOCOL_T0;   DWORD dwCurrentProtocol;   SCARDHANDLE hCard = 0;   LONG rc = 0;   zval* ctx_res; - zval* current_protocol; + zval current_protocol;   SCARDCONTEXT context;   char *strReaderName;   int strReaderNameLen; - MAKE_STD_ZVAL(current_protocol); - ZVAL_LONG(current_protocol,0); + ZVAL_LONG(&current_protocol,0);   if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rs|lz", &ctx_res, &strReaderName, &strReaderNameLen, &dwPreferredProtocol,&current_protocol) == FAILURE) {    RETURN_NULL();   } - ZEND_FETCH_RESOURCE(context,SCARDCONTEXT,&ctx_res,-1,PHP_PCSC_CTX_RES_NAME,le_pcsc_ctx_res); +  if ((context = (SCARDCONTEXT)zend_fetch_resource(Z_RES_P(ctx_res), PHP_PCSC_CTX_RES_NAME, le_pcsc_ctx_res)) == NULL) {

+        RETURN_FALSE;

+  }   rc = SCardConnect(context, strReaderName, SCARD_SHARE_SHARED, dwPreferredProtocol, &hCard, &dwCurrentProtocol);   if (rc != SCARD_S_SUCCESS) {

    PCSC_G(last_errno)=rc;
    RETURN_FALSE;

  } -  ZVAL_LONG(current_protocol,dwCurrentProtocol); + ZVAL_LONG(&current_protocol,dwCurrentProtocol); - ZEND_REGISTER_RESOURCE(return_value,(void*)hCard,le_pcsc_conn_res); + RETURN_RES(zend_register_resource((void*)hCard,le_pcsc_conn_res)); } Thanks in advance, Benedikt.