Can't get php+sqlite working

I'm struggling all morning to make php work with an sqlite database. Here is a piece of php code that I try to execute:

#less /var/www/html/test.php

<?php
    $db=new PDO("sqlite:/var/www/test.sql");
    $sql = "insert into test (login,pass) values ('login','pass');";
    $db->exec($sql);
?>

Here is how I've done tests:

# sqlite3 /var/www/test.sql
sqlite> create table test (login varchar,pass varchar);
#chown apache:apache /var/www/test.sql
#chmod 644 /var/www/test.sql

Here is the stuff that drives me mad: When I execute from command line:

#php test.php

everything goes well. Sql is being executed and I can see a new row appear in the database.

When I execute the same script from a browser - sql is not being executed. I don't get a new row in the database. There are no errors in the apache log file.

Please, help

UPDATE:

Ok, I've got the answer. It looks like sqlite is trying to create a new -journal file on "INSERT" query. strace rocks:

open("/var/www/test.sql-journal", O_RDWR|O_CREAT|O_EXCL|O_LARGEFILE, 0644) = -1 EACCES (Permission denied)

So, I had to move sqlite database to a directory, apache could write to.