Description:
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In PHP6, PDO seems unable to write to a sqlite database. 

However, just to make it interesting, it's only a problem when the script is executed by the webserver (in my case apache). 

Initially I thought it was a permissions issue, but the database file was 666.

Running the script from CLI worked as expected, running it from the webserver produced the error:
Warning: PDO::query() [function.query]: SQLSTATE[HY000]: General error: 1 unable to open database file

Confusing, because the database file is already open as demonstrated by the successful query of the same table in the previous line.

Reproduce code:
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<?php
$db = new PDO('sqlite:repository.db');
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);

$res = $db->query('SELECT visits from pages where id=1');
$tml = $res->fetchAll();
echo $tml[0][0], "\n";


$db->query('UPDATE pages SET visits = visits+1 WHERE id =1');


Expected result:
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23324

Actual result:
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23324
Warning: PDO::query() [function.query]: SQLSTATE[HY000]: General error: 1 unable to open database file in /home/aidan/public_html/repos/database/test.php on line 10