Warning: PostgreSQL query failed: ERROR: [my_table]: Permission denied in [my_php_program]

Can someone tell me why my PHP command [pg_exec ($database, $line );]
causes the "Permission denied" error.
I am trying to use PostgreSQL 7.2, PHP4, and Web-based apache user
I have focused on pg_hba.conf; -i option; and making sure that
user apache is a valid Unix user.
I have included the parts that may be helpful.

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Error Message:
octave ... INSERT INTO use VALUES ('2002-08-08', '18:04:34',
'136.183.17.43', '3222', 'Mozilla/4.72
[en] (X11; U; Linux 2.2.14-5.0 i686)' );

Warning: PostgreSQL query failed: ERROR: use: Permission denied. in
/var/www/html/octave/A2.php
on line 113

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A2.php: (lines 112 & 113)
print("$dbName ... $line<p>"); /* TEST */
pg_exec ($database, $line );

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pg_hba.conf:
host all 0.0.0.0 0.0.0.0 trust
host all 127.0.0.1 255.255.255.255 trust
local all trust

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/etc/rc.d/init.d/postgresql:
su -l postgres -s /bin/sh -c "/usr/bin/pg_ctl -o "-i" -D $PGDATA -p
/usr/bin/postmaster start > /dev/null 2>&1" < /dev/null

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firewall off

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Proof that apache user is authorized as a Unix user:
bash-2.05a$ psql -U apache octave
Welcome to psql, the PostgreSQL interactive terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
\? for help on internal
\g or terminate with semicolon to execute query
\q to quit

-----------------------------

Thanks,
Steve Barker