Dynamically change column name in PDO statement [duplicate]

Answer 1

You would need to do something like this:

$column = 'someColumn';

$stmt = $db->prepare("UPDATE tableName SET {$column} = :columnValue WHERE ID = :recordId");

Parameterized placeholders are only for values.

I would suggest you read the comment @YourCommonSense posted on your question.

Answer 2

In situations such as this, I use a different sort of replacement parameters, like so:

$unitLabel = 'store_number';
$sql = 'select * from users where [unitLabel] = :unit and level = :level;';
$sql = str_replace('[unitLabel]', $unitLabel, $sql);
$params = array(
  ':unit' => 300,
  ':level' => 'admin',
);
$stmt = $dbh->prepare($sql);
$stmt->execute($params);

The prepared SQL query ends up being processed (more or less) as:

SELECT * FROM USERS WHERE store_number = 300 AND level = 'admin';

Which works for my situation. I hope this helps. :)