So I have been trying to use COPY (SELECT...) TO STDOUT WITH (FORMAT CSV, HEADER) but:- PDO::query() uses prepare, which COPY does not support- PDO::exec() does not return results- PDO::pgsqlCopyToFile() does not support additional parameters, only delimiter and nulls (and columns)But do you know what it does support? SQL Injections!https://github.com/php/php-src/blob/7dfbf4d1b74b5e629f2331261944fa072a92e1cb/ext/pdo_pgsql/pgsql_driver.c#L870spprintf(&query, 0, "COPY %s TO STDIN WITH DELIMITER E'%c' NULL AS E'%s'", ...There is no escaping around any of that, so you can call this method like so:<?php$db->pgsqlCopyToFile("(select * from t1 cross join t2 using (whatever))", '/tmp/test.csv', ',', '\' header--');?>and that actually produces:COPY (select...) TO STDIN WITH DELIMITER E',' NULL AS E'' header--It still uses local filesystem, which I can live with, but at least I don't have to dance around the CSV headers.If anyone knows of a better way to do this without copying the (in my case gigantic) resultset into array and fputcsv(), I'm all ears. And I've tried every combination with pg_query and pg_copy_to to no avail.