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

Hi, 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