Description:
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The doc for PDOStatement::bindValue(): http://php.net/manual/en/pdostatement.bindvalue.php

Says that $sql_param can only be a string:

public bool SQLite3Stmt::bindValue ( string $sql_param , mixed $value [, int $type ] )

> sql_param
> An string identifying the statement variable to which the value should be bound.

However, as the commenter said 4 years ago at the bottom of the page, it can also be an integer for "?" placeholders:

> Note that this also works with positional placeholders using the '?' token:

<?php

$stmt = $db->prepare('SELECT * FROM mytable WHERE foo = ? AND bar = ?');
$stmt->bindValue(1, 'somestring', SQLITE3_TEXT);
$stmt->bindValue(2, 42, SQLITE3_INTEGER);

?>

> Positional numbering starts at 1.

So basically it accepts both named parameters and numerically indexed parameters, just like PDO. It would be nice to add this fact to the documentation.