PHP-7 zend_call_function() doesn't support symbol_table substitution

Zend/zend_execute_API.c

@@ -851,6 +851,9 @@ int zend_call_function(zend_fcall_info *fci, zend_fcall_info_cache *fci_cache) /
 		ZEND_ADD_CALL_FLAG(call, ZEND_CALL_CLOSURE);
 	}
 
+	/* PHP-7 doesn't support symbol_table substitution for functions */
+	ZEND_ASSERT(fci->symbol_table == NULL);
+
 	if (func->type == ZEND_USER_FUNCTION) {
 		int call_via_handler = (func->common.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE) != 0;
 		EG(scope) = func->common.scope;

sapi/phpdbg/phpdbg_prompt.c

@@ -121,7 +121,8 @@ static inline int phpdbg_call_register(phpdbg_param_t *stack) /* {{{ */
 			ZVAL_STRINGL(&fci.function_name, lc_name, name->len);
 			fci.size = sizeof(zend_fcall_info);
 			fci.function_table = &PHPDBG_G(registered);
-			fci.symbol_table = zend_rebuild_symbol_table();
+			//???fci.symbol_table = zend_rebuild_symbol_table();
+			fci.symbol_table = NULL;
 			fci.object = NULL;
 			fci.retval = &fretval;
 			fci.no_separation = 1;