Example 2 on the execute
page is what you want:
$sth->execute(array(':calories' => $calories, ':colour' => $colour));
You may want to look at the other examples too. With question mark parameters, it would be:
$q = $dbc -> prepare("INSERT INTO accounts (username, email, password) VALUES (?, ?, ?)");
$q->execute(array($_POST['username'], $_POST['email'], $_POST['password']));
If those are the only columns, you can just write:
$q = $dbc -> prepare("INSERT INTO accounts VALUES (?, ?, ?)");
$q->execute(array($_POST['username'], $_POST['email'], $_POST['password']));
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