diff -aurN a/crack.c b/crack.c
--- a/crack.c	2021-04-15 13:57:12.174874906 -0400
+++ b/crack.c	2021-04-15 14:10:21.203314001 -0400
@@ -68,9 +68,7 @@
 /* {{{ crack_module_entry
  */
 zend_module_entry crack_module_entry = {
-#if ZEND_MODULE_API_NO >= 20010901
     STANDARD_MODULE_HEADER,
-#endif
 	"crack",
 	crack_functions,
 	PHP_MINIT(crack),
@@ -78,9 +76,7 @@
 	PHP_RINIT(crack),
 	PHP_RSHUTDOWN(crack),
 	PHP_MINFO(crack),
-#if ZEND_MODULE_API_NO >= 20010901
-	"0.3",
-#endif
+	"0.4",
 	STANDARD_MODULE_PROPERTIES,
 };
 /* }}} */
@@ -102,57 +98,19 @@
 static void php_crack_init_globals(zend_crack_globals *crack_globals)
 {
 	crack_globals->last_message = NULL;
-#if PHP_VERSION_ID >= 70000
 	crack_globals->default_dict = NULL;
-#else
-	crack_globals->default_dict = -1;
-#endif
 }
 /* }}} */
 
 /* {{{ php_crack_checkpath
  */
-static int php_crack_checkpath(char* path TSRMLS_DC)
+static int php_crack_checkpath(char* path)
 {
 	char *filename;
 	int filename_len;
 	int result = SUCCESS;
 
-#if PHP_VERSION_ID < 50400
-	if (PG(safe_mode)) {
-		filename_len = strlen(path) + 10;
-		filename = (char *) emalloc(filename_len);
-		if (NULL == filename) {
-			return FAILURE;
-		}
-
-		memset(filename, '\0', filename_len);
-		strcpy(filename, path);
-		strcat(filename, ".pwd");
-		if (!php_checkuid(filename, "r", CHECKUID_CHECK_FILE_AND_DIR)) {
-			efree(filename);
-			return FAILURE;
-		}
-
-		memset(filename, '\0', filename_len);
-		strcpy(filename, path);
-		strcat(filename, ".pwi");
-		if (!php_checkuid(filename, "r", CHECKUID_CHECK_FILE_AND_DIR)) {
-			efree(filename);
-			return FAILURE;
-		}
-
-		memset(filename, '\0', filename_len);
-		strcpy(filename, path);
-		strcat(filename, ".hwm");
-		if (!php_checkuid(filename, "r", CHECKUID_CHECK_FILE_AND_DIR)) {
-			efree(filename);
-			return FAILURE;
-		}
-	}
-#endif
-
-	if (php_check_open_basedir(path TSRMLS_CC)) {
+	if (php_check_open_basedir(path)) {
 		return FAILURE;
 	}
 
@@ -162,7 +120,6 @@
 
 /* {{{ php_crack_set_default_dict
  */
-#if PHP_VERSION_ID >= 70000
 static void php_crack_set_default_dict(zend_resource *id)
 {
 	if (CRACKG(default_dict) != NULL) {
@@ -172,60 +129,32 @@
 	CRACKG(default_dict) = id;
 	id->gc.refcount++;
 }
-#else
-static void php_crack_set_default_dict(int id TSRMLS_DC)
-{
-	if (CRACKG(default_dict) != -1) {
-		zend_list_delete(CRACKG(default_dict));
-	}
-
-	CRACKG(default_dict) = id;
-	zend_list_addref(id);
-}
-#endif
 /* }}} */
 
 /* {{{ php_crack_get_default_dict
  */
-#if PHP_VERSION_ID >= 70000
 static zend_resource * php_crack_get_default_dict(INTERNAL_FUNCTION_PARAMETERS)
-#else
-static int php_crack_get_default_dict(INTERNAL_FUNCTION_PARAMETERS)
-#endif
 {
-#if PHP_VERSION_ID >= 70000
 	if ((NULL == CRACKG(default_dict)) && (NULL != CRACKG(default_dictionary))) {
-#else
-	if ((-1 == CRACKG(default_dict)) && (NULL != CRACKG(default_dictionary))) {
-#endif
 		CRACKLIB_PWDICT *pwdict;
 		printf("trying to open: %s\n", CRACKG(default_dictionary));
 		pwdict = cracklib_pw_open(CRACKG(default_dictionary), "r");
 		if (NULL != pwdict) {
-#if PHP_VERSION_ID >= 70000
 			ZVAL_RES(return_value, zend_register_resource(pwdict, le_crack));
 			php_crack_set_default_dict(Z_RES_P(return_value));
-#else
-			ZEND_REGISTER_RESOURCE(return_value, pwdict, le_crack);
-			php_crack_set_default_dict(Z_LVAL_P(return_value) TSRMLS_CC);
-#endif
 		}
 	}
-	
+
 	return CRACKG(default_dict);
 }
 /* }}} */
 
 /* {{{ php_crack_module_dtor
  */
-#if PHP_VERSION_ID >= 70000
 static void php_crack_module_dtor(zend_resource *rsrc)
-#else
-static void php_crack_module_dtor(zend_rsrc_list_entry *rsrc TSRMLS_DC)
-#endif
 {
 	CRACKLIB_PWDICT *pwdict = (CRACKLIB_PWDICT *) rsrc->ptr;
-	
+
 	if (pwdict != NULL) {
 		cracklib_pw_close(pwdict);
 	}
@@ -239,13 +168,10 @@
 #ifdef ZTS
 	ZEND_INIT_MODULE_GLOBALS(crack, php_crack_init_globals, NULL);
 #endif
-	
+
 	REGISTER_INI_ENTRIES();
 	le_crack = zend_register_list_destructors_ex(php_crack_module_dtor, NULL, "crack dictionary", module_number);
-#if PHP_VERSION_ID < 70000
-	Z_TYPE(crack_module_entry) = type;
-#endif
-	
+
 	return SUCCESS;
 }
 
@@ -263,12 +189,8 @@
 PHP_RINIT_FUNCTION(crack)
 {
 	CRACKG(last_message) = NULL;
-#if PHP_VERSION_ID >= 70000
 	CRACKG(default_dict) = NULL;
-#else
-	CRACKG(default_dict) = -1;
-#endif
-	
+
 	return SUCCESS;
 }
 /* }}} */
@@ -280,7 +202,7 @@
 	if (NULL != CRACKG(last_message)) {
 		efree(CRACKG(last_message));
 	}
-	
+
 	return SUCCESS;
 }
 /* }}} */
@@ -292,7 +214,7 @@
 	php_info_print_table_start();
 	php_info_print_table_header(2, "crack support", "enabled");
 	php_info_print_table_end();
-	
+
 	DISPLAY_INI_ENTRIES();
 }
 /* }}} */
@@ -304,32 +226,23 @@
 	char *path;
 	size_t path_len;
 	CRACKLIB_PWDICT *pwdict;
-	
-	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &path, &path_len) == FAILURE) {
+
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "s", &path, &path_len) == FAILURE) {
 		RETURN_FALSE;
 	}
-	
-	if (php_crack_checkpath(path TSRMLS_CC) == FAILURE) {
+
+	if (php_crack_checkpath(path) == FAILURE) {
 		RETURN_FALSE;
 	}
-	
+
 	pwdict = cracklib_pw_open(path, "r");
 	if (NULL == pwdict) {
-#if ZEND_MODULE_API_NO >= 20021010
-		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Could not open crack dictionary: %s", path);
-#else
-		php_error(E_WARNING, "Could not open crack dictionary: %s", path);
-#endif
+		php_error_docref(NULL, E_WARNING, "Could not open crack dictionary: %s", path);
 		RETURN_FALSE;
 	}
 
-#if PHP_VERSION_ID >= 70000
 	RETURN_RES(zend_register_resource(pwdict, le_crack));
 	php_crack_set_default_dict(Z_RES_P(return_value));
-#else
-	ZEND_REGISTER_RESOURCE(return_value, pwdict, le_crack);
-	php_crack_set_default_dict(Z_LVAL_P(return_value) TSRMLS_CC);
-#endif
 }
 /* }}} */
 
@@ -338,33 +251,20 @@
 PHP_FUNCTION(crack_closedict)
 {
 	zval *dictionary = NULL;
-#if PHP_VERSION_ID >= 70000
 	zend_resource *id;
-#else
-	int id = -1;
-#endif
 	CRACKLIB_PWDICT *pwdict;
-	
-	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|r", &dictionary)) {
+
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|r", &dictionary)) {
 		RETURN_FALSE;
 	}
-	
+
 	if (NULL == dictionary) {
 		id = php_crack_get_default_dict(INTERNAL_FUNCTION_PARAM_PASSTHRU);
-#if PHP_VERSION_ID >= 70000
 		if (id == NULL) {
-#else
-		if (id == -1) {
-#endif
-#if ZEND_MODULE_API_NO >= 20021010
-			php_error_docref(NULL TSRMLS_CC, E_WARNING, "Could not open default crack dicionary"); 
-#else
-			php_error(E_WARNING, "Could not open default crack dicionary"); 
-#endif
+			php_error_docref(NULL, E_WARNING, "Could not open default crack dicionary"); 
 			RETURN_FALSE;
 		}
 	}
-#if PHP_VERSION_ID >= 70000
 	if((pwdict = (CRACKLIB_PWDICT *)zend_fetch_resource(Z_RES_P(dictionary), "crack dictionary", le_crack)) == NULL)
 	{
 		RETURN_FALSE;
@@ -376,17 +276,6 @@
 	else {
 		zend_list_close(Z_RES_P(dictionary));
 	}
-#else
-	ZEND_FETCH_RESOURCE(pwdict, CRACKLIB_PWDICT *, &dictionary, id, "crack dictionary", le_crack);
-
-	if (NULL == dictionary) {
-		zend_list_delete(CRACKG(default_dict));
-		CRACKG(default_dict) = -1;
-	}
-	else {
-		zend_list_delete(Z_RESVAL_P(dictionary));
-	}
-#endif
 	RETURN_TRUE;
 }
 /* }}} */
@@ -404,25 +293,20 @@
 	size_t gecos_len;
 	char *message;
 	CRACKLIB_PWDICT *pwdict;
-#if PHP_VERSION_ID >= 70000
 	zend_resource *crack_res;
-#else
-	int id = -1;
-#endif
-	
+
 	if (NULL != CRACKG(last_message)) {
 		efree(CRACKG(last_message));
 		CRACKG(last_message) = NULL;
 	}
-	
-	if (zend_parse_parameters_ex(ZEND_PARSE_PARAMS_QUIET, ZEND_NUM_ARGS() TSRMLS_CC, "rs", &dictionary, &password, &password_len) == FAILURE) {
-		if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|ssr", &password, &password_len, &username, &username_len, &gecos, &gecos_len, &dictionary) == FAILURE) {
+
+	if (zend_parse_parameters_ex(ZEND_PARSE_PARAMS_QUIET, ZEND_NUM_ARGS(), "rs", &dictionary, &password, &password_len) == FAILURE) {
+		if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|ssr", &password, &password_len, &username, &username_len, &gecos, &gecos_len, &dictionary) == FAILURE) {
 			RETURN_FALSE;
 		}
 	}
-	
+
 	if (NULL == dictionary) {
-#if PHP_VERSION_ID >= 70000
 		crack_res = php_crack_get_default_dict(INTERNAL_FUNCTION_PARAM_PASSTHRU);
 		if (crack_res == NULL || crack_res->ptr == NULL) {
 			php_error(E_WARNING, "Could not open default crack dicionary");
@@ -436,22 +320,9 @@
 			RETURN_FALSE;
 		}
 	}
-#else
-		id = php_crack_get_default_dict(INTERNAL_FUNCTION_PARAM_PASSTHRU);
-		if (id == -1) {
-#if ZEND_MODULE_API_NO >= 20021010
-			php_error_docref(NULL TSRMLS_CC, E_WARNING, "Could not open default crack dicionary"); 
-#else
-			php_error(E_WARNING, "Could not open default crack dicionary"); 
-#endif
-			RETURN_FALSE;
-		}
-	}
-	ZEND_FETCH_RESOURCE(pwdict, CRACKLIB_PWDICT *, &dictionary, id, "crack dictionary", le_crack);
-#endif
-	
+
 	message = cracklib_fascist_look_ex(pwdict, password, username, gecos);
-	
+
 	if (NULL == message) {
 		CRACKG(last_message) = estrdup("strong password");
 		RETURN_TRUE;
@@ -470,21 +341,13 @@
 	if (ZEND_NUM_ARGS() != 0) {
 		WRONG_PARAM_COUNT;
 	}
-	
+
 	if (NULL == CRACKG(last_message)) {
-#if ZEND_MODULE_API_NO >= 20021010
-		php_error_docref(NULL TSRMLS_CC, E_WARNING, "No obscure checks in this session");
-#else
-		php_error(E_WARNING, "No obscure checks in this session");
-#endif
+		php_error_docref(NULL, E_WARNING, "No obscure checks in this session");
 		RETURN_FALSE;
 	}
-	
-#if PHP_VERSION_ID >= 70000
+
 	RETURN_STRING(CRACKG(last_message));
-#else
-	RETURN_STRING(CRACKG(last_message), 1);
-#endif
 }
 /* }}} */
 
diff -aurN a/php_crack.h b/php_crack.h
--- a/php_crack.h	2021-04-15 13:57:12.174874906 -0400
+++ b/php_crack.h	2021-04-15 14:10:28.853298881 -0400
@@ -52,11 +52,7 @@
 ZEND_BEGIN_MODULE_GLOBALS(crack)
     char *default_dictionary;
 	char *last_message;
-#if PHP_VERSION_ID >= 70000
 	zend_resource *default_dict;
-#else
-	int default_dict;
-#endif
 ZEND_END_MODULE_GLOBALS(crack)
 
 #ifdef ZTS