Migrating from ADODB to PDO - pdo

Question

I have a database query which uses ADODB with unnamed placeholders to insert data into a database and I'm trying to convert it to use PDO but I'm getting an error which is probably due to the syntax I'm using.
What I'm trying:
In an included file I have the following shared function:
function insCOA($data) {
global $dbh;
try {
$sth=$dbh->prepare("
INSERT INTO
coa
(
nom_code,
acc_title,
acc_type_id,
acc_desc
) VALUES (
?,
?,
?,
?
)
");
for ($i = 0; $i < count($data); $i++) {
$sth->execute($data[$i]);
$last_insert_id = $dbo->lastInsertId();
}
}
catch(PDOException $e) {
echo "Something went wrong. Please report this error.";
file_put_contents('/PDOErrors.txt', $e->getMessage(), FILE_APPEND);
}
return $last_insert_id;
}
In my PHP page I have the following:
// Add to coa table
$data = array(
array(
$nom_code, /* nom_code */
$acc_title, /* acc_title */
$acc_type_id, /* acc_type_id */
$acc_desc /* acc_desc */
)
);
$coa_id = insCOA($data);
The connection is handled elsewhere and is connecting ok. It is exported in a global as $dbh.
The error I'm getting is
Fatal error: Call to a member function lastInsertId() on a non-object in /common.funcs.php on line 574 (which is where the reference is to lastInsertId() above.
Originally, when using ADODB, the shared function was as follows:
The shared function:
function insCOA($data) {
global $conn;
$sql = "
INSERT INTO
coa
(
nom_code,
acc_title,
acc_type_id,
acc_desc
) VALUES (
?,
?,
?,
?
)
";
for ($i = 0; $i < count($data); $i++) {
if ($conn->Execute($sql,$data[$i]) === false) {
print 'error' . $conn->ErrorMsg() . '<br />Query: ' . $sql;
} else {
$last_insert_id = $conn->Insert_ID();
}
}
return $last_insert_id;
}
In the PHP page nothing changed.
Once I've got this working, I'll be able to convert a bunch of other queries, so solving this will be very useful. This is my first attempt to use PDO. Thanks.

Answer 1

Found the error myself which was:
$dbo->lastInsertId();
should be
$dbh->lastInsertId();
It's now working perfectly.