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Using SQlite3 in PHP how to count the number of rows in a result set?

currently I am using:

$result = new SQLite3(sprintf("users/USERIDS_DB.sqlite"));

$numRows = $result->exec ("SELECT count(*) FROM USERIDS");

echo sprintf("the number of rows are: %d", $numRows);

but the result is 1 when it should be 6 (the number of rows I created using firefox sqlite3 addon)

Can anybody help please?

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$db = new SQLite3('filename.db3');
$count = $db->querySingle("SELECT COUNT(*) as count FROM tablename");
echo $count;

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