Migrating from Postgres 8.4.11/PHP 5.3.3 to Postgres 9.2.5/PHP 5.4.16 - syntax error on INSERT

I'm migrating some small php pages from Postgress 8.4.11/PHP 5.3.3 to Postgres 9.2.5/PHP 5.4.16, and I've fixed most of the issues relating to changing from DB to MDB2, but I can't get any database updates to work, I get a syntax error.

Here's a sample of the code:

$howmany=$mdb2->query('insert into sup_sup_response (
		response_problem_no,
		response_response_date,
		response_date,
		response_resolved_by,
		response_description,
		response_follow_up_dte,
		response_time_spent) values (?,?,?,?,?,?,?)', $response);

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I get this syntax error:

The error was: MDB2 Error: syntax error
More Details: _doQuery: [Error message: Could not execute statement] [Last executed query: insert into sup_sup_response ( response_problem_no, response_response_date, response_date, response_resolved_by, response_description, response_follow_up_dte, response_time_spent) values (?,?,?,?,?,?,?)] [Native message: ERROR: syntax error at or near "," LINE 8: response_time_spent) values (?,?,?,?,?,?,?) ^]

I tried:

$howmany=$mdb2->query('insert into sup_sup_response (
		response_problem_no,
		response_response_date,
		response_date,
		response_resolved_by,
		response_description,
		response_follow_up_dte,
		response_time_spent) values ($response[0], $response[1]..etc)';

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but that didn't work either.

It's been years since I've done anything in php, so I'm stumped.

What am I missing?

Thanks.