Be more precise about possible types for mysqli methods

mysqli has an uncommon approach to 64-bit compatibility:
it will convert numbers that can't be represented on 32-bit
platforms to a string.
This is documented at
https://www.php.net/manual/en/mysqli-stmt.affected-rows.php#refsect1-mysqli-stmt.affected-rows-returnvalues

So if there's a query to a remote mysqli server that affects
more than 2.2 billion rows, then the opcache inference might be
incorrect.

(It's possible to add a MAY_BE_STRING_ON_32_BIT_PLATFORM bitflag macro to
account for this, but I don't think there's a need or want to?)

Patches 3162285

This is based on the list of php 7.4 functions using
MYSQLI_RETURN_LONG_INT in mysqli_api.c

Author: TysonAndre

ext/mysqli/mysqli_api.c

@@ -2029,8 +2029,8 @@ PHP_FUNCTION(mysqli_stmt_send_long_data)
 }
 /* }}} */
 
-/* {{{ proto mixed mysqli_stmt_affected_rows(object stmt)
-   Return the number of rows affected in the last query for the given link */
+/* {{{ proto string|int|false mysqli_stmt_affected_rows(object stmt)
+   Return the number of rows affected in the last query for the given link. */
 PHP_FUNCTION(mysqli_stmt_affected_rows)
 {
 	MY_STMT			*stmt;

ext/mysqli/mysqli_priv.h

@@ -90,6 +90,7 @@ PHP_MYSQLI_EXPORT(zend_object *) mysqli_objects_new(zend_class_entry *);
 	mysql->multi_query = 1; \
 }
 
+/* Numbers that cannot be represented as a signed int are converted to a string instead (affects 32-bit builds). */
 #define MYSQLI_RETURN_LONG_INT(__val) \
 { \
 	if ((__val) < ZEND_LONG_MAX) {		\

ext/opcache/Optimizer/zend_func_info.c

@@ -1028,7 +1028,7 @@ static const func_info_t func_infos[] = {
 	F1("mysqli_fetch_all",						MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_ARRAY | MAY_BE_ARRAY_KEY_ANY | MAY_BE_ARRAY_OF_ANY),
 	F1("mysqli_fetch_object",					MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_OBJECT),
 	F0("mysqli_free_result",					MAY_BE_NULL),
-	F0("mysqli_affected_rows",					MAY_BE_NULL | MAY_BE_LONG),
+	F1("mysqli_affected_rows",					MAY_BE_NULL | MAY_BE_LONG | MAY_BE_STRING),
 	F0("mysqli_autocommit",						MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
 	F0("mysqli_stmt_bind_param",				MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
 	F0("mysqli_stmt_bind_result",				MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
@@ -1064,14 +1064,14 @@ static const func_info_t func_infos[] = {
 	F0("mysqli_get_server_version",				MAY_BE_NULL | MAY_BE_LONG),
 	F1("mysqli_info",							MAY_BE_NULL | MAY_BE_STRING),
 	F1("mysqli_init",							MAY_BE_FALSE | MAY_BE_OBJECT),
-	F0("mysqli_insert_id",						MAY_BE_NULL | MAY_BE_LONG),
+	F1("mysqli_insert_id",						MAY_BE_NULL | MAY_BE_LONG | MAY_BE_STRING),
 	F0("mysqli_kill",							MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
 	F0("mysqli_more_results",					MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
 	F0("mysqli_next_result",					MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
 	F0("mysqli_stmt_more_results",				MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
 	F0("mysqli_stmt_next_result",				MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
 	F0("mysqli_num_fields",						MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_LONG),
-	F0("mysqli_num_rows",						MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_LONG),
+	F1("mysqli_num_rows",						MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_LONG | MAY_BE_STRING),
 	F0("mysqli_options",						MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
 	F0("mysqli_ping",							MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
 	F1("mysqli_prepare",						MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_OBJECT),
@@ -1080,15 +1080,15 @@ static const func_info_t func_infos[] = {
 	F1("mysqli_real_escape_string",				MAY_BE_NULL | MAY_BE_STRING),
 	F0("mysqli_rollback",						MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
 	F0("mysqli_stmt_send_long_data",			MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
-	F0("mysqli_stmt_affected_rows",				MAY_BE_NULL | MAY_BE_LONG),
+	F1("mysqli_stmt_affected_rows",				MAY_BE_NULL | MAY_BE_LONG | MAY_BE_STRING),
 	F0("mysqli_stmt_close",						MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
 	F0("mysqli_stmt_data_seek",					MAY_BE_NULL | MAY_BE_FALSE),
 	F0("mysqli_stmt_field_count",				MAY_BE_NULL | MAY_BE_LONG),
 	F0("mysqli_stmt_free_result",				MAY_BE_NULL),
-	F0("mysqli_stmt_insert_id",					MAY_BE_NULL | MAY_BE_LONG),
+	F1("mysqli_stmt_insert_id",					MAY_BE_NULL | MAY_BE_LONG | MAY_BE_STRING),
 	F0("mysqli_stmt_param_count",				MAY_BE_NULL | MAY_BE_LONG),
 	F0("mysqli_stmt_reset",						MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
-	F0("mysqli_stmt_num_rows",					MAY_BE_NULL | MAY_BE_LONG),
+	F1("mysqli_stmt_num_rows",					MAY_BE_NULL | MAY_BE_LONG | MAY_BE_STRING),
 	F0("mysqli_select_db",						MAY_BE_NULL | MAY_BE_FALSE | MAY_BE_TRUE),
 	F1("mysqli_sqlstate",						MAY_BE_NULL | MAY_BE_STRING),
 	F0("mysqli_ssl_set",						MAY_BE_NULL | MAY_BE_TRUE),