ibase_query - in php 7 is required the "link identifier"?

Hello

I'm migrating from PHP 5.2 to PHP 7.0.0 VC14 x64 TS and using Firebird 2.5
on windows


From Manual

<<
ibase_query

(PHP 5)
ibase_query — Execute a query on an InterBase database

Description

resource ibase_query ([ resource $link_identifier ], string $query [, int
$bind_args ] )
Performs a query on an InterBase database.

Parameters

link_identifier
An InterBase link identifier. If omitted, the last opened link is assumed.
>>

If link identifier is omitted, so that the last opened link is used, then
php returns only ERR_CONNECTION_RESET.

I searched for ibase_query on full changelog (5.X /7.0) and I found nothing.

in php 7 is required the "link identifier" or is a bug?

if it is required, the change was documented in one migration guides or
changelog?

thanks