Description:
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It's not possible to pass bytea values to pg_query_params or pg_execute. It seems like ext/pgsql does no escaping where it should. ext/pgsql is built against libpq 8.3.1.

Reproduce code:
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<?php
$conn = pg_connect(...);
pg_set_client_encoding($conn, 'UTF8');
$res = pg_query_params('SELECT $1::bytea', array("\xf6"));
var_dump(pg_fetch_array($res));

Expected result:
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Some binary string :)

Actual result:
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Warning: pg_query_params(): Query failed: ERROR:  invalid byte sequence for encoding "UTF8": 0xf6
HINT:  This error can also happen if the byte sequence does not match the encoding expected by the server, which is controlled by "client_encoding". in ...